DSpace community: 土木工程學系暨研究所

Automatic BIM-Based Formwork Quantification System

Tue, 19 May 2026 04:05:13 GMT

title: Automatic BIM-Based Formwork Quantification System abstract: Building information modeling (BIM) has significantly enhanced the efficiency of quantity takeoff in construction projects. However, existing BIM-based tools for formwork quantification often lack critical functionalities particularly in handling element intersections, irregular geometries, and practical construction considerations. In addition, many current systems rely on manual reprocessing or require multiple software platforms to reflect updates to the BIM model, which limits their effectiveness in dynamic project environments characterized by frequent design revisions. This study presents the development of a fully automated BIM-based formwork quantification system (BFQS), created in collaboration with a general contractor and validated through real-world implementation. The system focuses specifically on quantifying formwork areas. BFQS operates within a single, integrated Revit-based platform and enables automatic, real-time updates of formwork quantities in both two-dimensional (2D) and three-dimensional (3D) environments. It incorporates advanced modeling logic to accommodate diverse on-site conditions, including stair formwork, intersection deductions, small openings, soft intersections, irregular geometries, and the exclusion of nonformwork elements such as lightweight partitions. By maintaining continuous synchronization with the BIM model, the system effectively facilitates project workflows where frequent design revisions occur, thereby enhancing accuracy and responsiveness throughout the design and construction phases. BFQS addresses key limitations of previous tools by incorporating practical parameter settings that reflect real-world construction conditions, contributing meaningfully to the advancement of BIM-based automation in formwork estimation.

Integration of AR and deep learning-based image classification using CNN for construction project monitoring.

Tue, 19 May 2026 04:05:10 GMT

title: Integration of AR and deep learning-based image classification using CNN for construction project monitoring. abstract: With manual update, progress monitoring of a construction project is notably challenging due to its labor-intensive and time-consuming nature. The issue of manual update has been proposed to be alleviated by automatic update, but most existing AI-based progress tracking approaches are based on counting the elements finished. As a result, they cannot accurately reflect actual progress status to the project management. This research aims to develop a system that updates the progress of the construction project by effectively identifying both the construction category and operational stage. It is achieved by systematically integrating the techniques of Augmented Reality (AR) and deep learning–based image classification with convolutional neural networks (CNNs). The proposed scheme enables real-time data capture, facilitating comprehensive progress evaluation across multiple project locations. Its effectiveness is demonstrated using a case study of an interior finishing project for a building in Tamkang University, Taiwan. It reveals that the proposed system accurately identifies the construction category and operational stage based on the materials applied, enabling precise tracking of the progress. The results confirm that the proposed scheme significantly enhances the accuracy in construction progress monitoring, avoiding manual inspection and minimizing discrepancies between the planned and actual progress.

基於位移極值反應之橋梁等值靜力風載重

Wed, 25 Mar 2026 04:07:49 GMT

title: 基於位移極值反應之橋梁等值靜力風載重 abstract: 對於高層建築或是橋梁之類柔度較高的建築而言，風致抖振是其重要的結構振動之一，而等值靜力風載重目的在將結構的風致動態反應轉化為等效的靜載重，為風洞試驗與結構工程師之間重要的溝通橋梁。傳統上常見的等值靜力風載重有陣風反應因子法(GLF)、慣性力分佈法(IWL)或是LRC法等。結構的風致反應依反應特性不同可區分為背景反應以及共振反應兩部分，在其靜力風載重計算上可由LRC法獲得整體背景反應對應之等值靜力風載重；對於共振反應對應的等值靜力風載重則可藉由考慮數個振態慣性力獲得，最後再經由載重組合得到結構物的等值靜力風載重，而該方法本質上是不考慮振態間的相關性，因此對於普通高層建物、電塔等結構耦合不明顯的結構適用性佳。然而對於線型特殊、大跨度等結構，由於其結構耦合特性明顯，在計算其静力風載重時，則必須要考慮振態間的相關性。本研究旨在為耦合結構提供一合適的風載重計算方法，本研究內容包含兩大部分，第一部分介紹本研究中所提出之靜力風載重計算方式，該方法考慮振態間的相關性，為一以單一特定位置的位移極值反應為目標的計算方式，該方法是一基於散漫理論之率域數值方法，因此亦可藉由顫振導數考慮橋梁之氣彈影響。而第二部分則為驗證的部分，本文選定一座中短跨徑之人行拱橋作為研究標的，並使用結構系統力學能來作為參予振態選擇上的參考。數值案例中分別以主樑中點拖曳向、邊跨垂直向以及中點扭轉向為目標計算其等值靜力風載重，結果顯示所，本文所提出等值靜力風載重所得到之靜力位移與結構之動態位移反應極值相當吻合，該方法應可對工程實務上有所幫助。

現今主應力對裂面再滑動之影響

Wed, 25 Mar 2026 04:07:45 GMT

title: 現今主應力對裂面再滑動之影響

Damage measures of low-rise building foundations on layered sands due to earthquake impacts

Wed, 25 Mar 2026 04:07:41 GMT

title: Damage measures of low-rise building foundations on layered sands due to earthquake impacts

The influences of input ground motions on ground displacements

Wed, 25 Mar 2026 04:07:36 GMT

title: The influences of input ground motions on ground displacements

A study on total factor of safety for liquefaction potential assessment

Thu, 19 Mar 2026 04:07:43 GMT

title: A study on total factor of safety for liquefaction potential assessment

Damage measures of low-rise building foundations on layered sands due to seismic impacts

Thu, 19 Mar 2026 04:07:35 GMT

title: Damage measures of low-rise building foundations on layered sands due to seismic impacts

Ameliorating the Profound Gender Wage Gap in the AEC Industry among the APEC members

Tue, 17 Mar 2026 04:05:18 GMT

title: Ameliorating the Profound Gender Wage Gap in the AEC Industry among the APEC members abstract: This research aims to discover the challenges and propose effective strategies to empower women by ameliorating the gender wage gap in the architecture, engineering and construction (AEC) industry among the APEC members. The study applied document review analysis and conducted focus group discussions, where thirty female professionals in the AEC industry from APEC participated. The results report four challenges contributing to the gender wage gap, namely gender bias and stereotyping, work-family conflicts, physical strength and lack of transparency. Based on the challenges, the study suggests several key strategies focusing on women's participation in the AEC industry, encouraging gender-friendly workplaces, healthy and safe workplaces, and fair career development opportunities to reduce the gender wage gap effectively. The findings suggest that by increasing awareness of the value of women's involvement in the AEC industry, pragmatic policies should be formulated for APEC members to break down the barriers to the gender wage gap.

Experimental study on the internal structure and physical properties of rock-avalanche deposits

Thu, 12 Mar 2026 04:05:26 GMT

title: Experimental study on the internal structure and physical properties of rock-avalanche deposits

Mechanical behavior assessment of a deep geological repository in the Kinmen Granite using Particle Flow Code

Thu, 12 Mar 2026 04:05:22 GMT

title: Mechanical behavior assessment of a deep geological repository in the Kinmen Granite using Particle Flow Code abstract: Mechanical stability of underground geological disposal openings for radioactive wastes is a concern because excavated surfaces experience elevated or lowered stress concentration, leading to failure post excavation. The PFC (Particle Flow Code) model, applied to the Kinmen Granite (Taiwan) in this study, reveals that the crack initiation and damage stresses are 0.4 UCS and 0.8 UCS, respectively. Simulated acoustic emission events increase near peak strength, accompanied by clustering of cracks. The input parameters for the PFC were numerically calibrated using laboratory experimental stress–strain curves. A key finding of this study is that the random bond-strength PFC model better characterises the stress-strain behaviour and brittle failure of the Kinmen Granite compared to uniform bond-strength PFC model. Triangular tensile failure zones arise near the spring line of the deposition tunnel post excavation. Thereafter, when the deposition hole is created below the tunnel, much of the contact force fails to reach its top due to the shelter effect from the wider tunnel. Low contact forces appear at the top quarter of the deposition hole, which will likely promote spalling (tensile failure) in this part and near the spring line of the overlying tunnel. This observation agrees with the Aspo Hard Rock field tests.

耦合橋梁結構之等值靜力風載重

Fri, 06 Mar 2026 04:07:05 GMT

title: 耦合橋梁結構之等值靜力風載重 abstract: 現代橋梁著重於美學設計，特殊幾何線型往往導致橋梁結構耦合特性更加顯著。常見的等值靜力風載重計算方式在共振部分大都不考慮振態間相關性，較不適用。本文旨在為耦合結構提供一合適的風載重計算方法。文章包含兩部分，第一部分介紹本研究所提出之靜力風載重計算方式，該方法以單一特定位置的位移極值反應為目標，是一基於散漫振動理論之率域方法，亦可方便的藉由顫振導數考慮橋梁之氣彈影響。第二部分為驗證部分，本文中依據結構耦合程度高低選定兩座橋梁結構做為分析案例，兩案例結果均顯示，本文所提出等值靜力風載重可以良好重現橋梁的動態極值位移反應。

人行拱橋顫振與抖振分析

Fri, 06 Mar 2026 04:07:00 GMT

title: 人行拱橋顫振與抖振分析 abstract: 長跨徑人行拱橋近年來深受工程師青睞，此類型之橋梁除了滿足交通需求外，更扮演當地景觀地標的角色。因為人行拱橋的橋面板較窄，大多採用單拱設計，而單拱構造缺乏側向支撐，拱橋順風向之氣動力反應也越趨明顯。基於此，本文建立一數值分析模式，以主樑斷面及橋拱斷面之顫振導數及風力係數為基礎，推導人行拱橋整體結構之顫振與抖振理論。並採用兩範例來探討加入橋拱風力對整體顫振臨界風速與抖振位移反應影響。結果顯示，橋梁顫振之臨界風速主要受主樑氣動力行為控制，橋拱順風向顫振導數對顫振影響並不顯著。抖振分析方面，兩例之計算結果都顯示拱風力對拱及主樑垂直向反應影響不大，但對於順風向及扭轉向反應有顯著影響。當橋面高度之平均風速 60 m/s 時，加入橋拱風力對第一範例中主樑順風向與扭轉向之抖振位移反應分別提高 1.9% 及 44.11%；對第二範例則分別提升了 11.99% 及 133%。由於影響顯著，因此分析時須詳加考慮。

斜張橋模型修正與氣動力分析

Thu, 26 Feb 2026 04:08:59 GMT

title: 斜張橋模型修正與氣動力分析

山區懸索橋梁之風致反應評估

Thu, 26 Feb 2026 04:08:54 GMT

title: 山區懸索橋梁之風致反應評估

Serviceability performance of piled raft foundations under vertical loads in clayey and sandy soils

Tue, 16 Sep 2025 04:08:21 GMT

title: Serviceability performance of piled raft foundations under vertical loads in clayey and sandy soils abstract: This study investigated the serviceability performance of piled raft foundations (or combined pile-raft foundations, CPRF) in various soils using three-dimensional (3D) finite element analysis. The piled raft foundation was assumed to be embedded respectively in homogeneous clayey soils and sandy soils under vertical loading. The displacements and reactions of the piles were carefully observed. In comparing the influences of soil stiffness, raft width, pile-to-pile spacing distance, and pile length, it was found that the embedment depth of the foundation could significantly affect the serviceability of the piles. For embedment depths ranging from 0 m to 12 m, the pile loads can be reduced by approximately 40 % to 60 % of the foundation load, depending on the number of piles involved. The displacements of piled raft foundations in clays decrease with increased embedment depth. However, the effects of embedment depth on foundation displacements are smaller in sands. Furthermore, the load ratio of the piles and the displacement ratio of the CPRF were calculated to demonstrate their dependence on the slenderness ratio of the piles and the number of piles. Both ratios aligned with the guidelines the International Society for Soil Mechanics and Geotechnical Engineering (ISSMGE) proposed for CPRF systems. Notably, attention is drawn to the depth of raft embedment, as it significantly influences pile responses.

A study on subsoil and pile reactions of embedded piled raft foundations in sandy soils under vertical loads

Mon, 01 Sep 2025 04:05:28 GMT

title: A study on subsoil and pile reactions of embedded piled raft foundations in sandy soils under vertical loads abstract: This study investigated the load-settlement mechanism of embedded piled raft foundations in sandy soils (ranging from loose to low medium dense sands) under vertically uniform loads through a series of three-dimensional finite element analyses. The foundation model comprises a square concrete raft, varying in width from 16 to 36 m, and embedded at depths of 8 and 12 m from the ground surface. Concrete piles with a diameter of 1 m and lengths of 20 m and 30 m were installed beneath the raft. The foundation was located in homogeneous sands with shear wave velocities ranging from 150 to 210 m/s. Consequently, the modulus of subgrade reaction of the subsoil and the coefficient of pile reaction were both reported. This study examined and presented alternative dimensionless measures of pile displacements, pile reactions, and corresponding coefficients of pile reactions to facilitate hand calculations. Optimized correlations were suggested using box plots and regression analyses for the dimensionless measures with the non-dimensional design parameters of the foundation. Upon verifying the proposed suggestions on a sample example, we conclude that the proposed method offers a preliminary calculation tool for the design of piled raft foundation design in the studied sands.

A closed form formula for equity valuation model based on differential equation

Wed, 30 Jul 2025 04:06:22 GMT

title: A closed form formula for equity valuation model based on differential equation abstract: The valuation of intrinsic value is the cornerstone of value investing. When shareholders purchase a company’s stock, they are essentially buying claims to its future earnings and shareholder equity. Two main approaches, income-based and asset-based, have been developed to value equities. However, these approaches focus solely on either the company’s earnings or its shareholder equity. To overcome these limitations, the Growth Valuation Model (GVM) was developed, which incorporates both income and asset-based aspects. While the GVM model has the advantage of a closed-form solution, it still relies on a discrete infinite series, a common limitation of equity valuation models. In contrast, continuous differential equations have been successfully employed to develop a variety of option pricing models. However, there is a scarcity of equity valuation models derived using continuous differential equations, which is a gap in the current financial modeling landscape. This paper addresses this gap by developing a theoretical equity valuation model, the Continuous Growth Value Model (CGVM), based on a continuous differential equation, and deriving its closed-form solution. Our study concludes: (1) The GVM and CGVM models are developed under three discrete-typed and three continuous-typed assumptions, respectively. Therefore, they can be considered as the discrete and continuous versions of a valuation approach based on the same core principle: mean reversion of return on equity (ROE). (2) The reciprocal of the exponential decay rate in CGVM plays a similar role to the growth coefficient in GVM. (3) The theoretical curves between ROE and P/B ratio of CGVM and GVM are close to each other, and when ROE equals the required return rate, both models will have a P/B ratio of 1.0. (4) Only when the current ROE is greater than the required return rate, the persistence of ROE does have a positive effect on intrinsic value.

Application of boundary integral quadrature method to torsion problems of an isotropic bar containing edge cracks

Wed, 30 Jul 2025 04:06:17 GMT

title: Application of boundary integral quadrature method to torsion problems of an isotropic bar containing edge cracks abstract: Regarding the Saint-Venant torsion problem of elastic cylindrical bar containing edge cracks, the boundary integral quadrature method (BIQM) in conjunction with the dual formula is employed to solve the stress function. In comparison with the conventional dual boundary element method (BEM), the present method is not required to generate the mesh. To achieve this advantage, the parametric representation for the boundary contour and the Gaussian quadrature for the boundary integral play important roles in the present method. When the collocation point is located on the ordinary boundary, the original adaptive exact solution is used to skillfully determine the singular integral in the Cauchy principal value sense. When the collocation point is located on the crack, the corresponding adaptive exact solution is rederived by using the linear combination of harmonic basis of elliptical coordinates. To realize the effect upon the elastic cylinder due to the crack, the torsional rigidity of the cross-section and the stress intensity factor (SIF) at the crack tip are considered to calculate. To conveniently determine the torsional rigidity, the formula is transformed into the form of the boundary quadrature of the boundary density. To the computation of the SIF, the corresponding boundary data on the boundary point that is the most nearly the crack tip is adopted. To check the validity of present results, the conventional dual BEM is adopted to examine those results. Finally, 3 elastic cylindrical bars of different cross-sections are considered. Two of them are circular cross-sections with a radial edge crack and a slant edge crack and the other is an elliptical cross-section with two edge cracks.

Comparison of the results of different types of testing piles with static load to predict the load capacity of piles

Tue, 22 Jul 2025 04:05:22 GMT

title: Comparison of the results of different types of testing piles with static load to predict the load capacity of piles abstract: This paper presents the results of four full-scale static pile load tests that were performed at a site in Astana, Kazakhstan that is underlain by problematic soils. In each test, the bored pile measured 1000 mm in diameter and had a length of 31.5 m. Two of the four static pile load tests were of the standard "top-down" variety. One of these tests was performed in accordance with ASTM D 1143-07; the other was performed in accordance with GOST 5686.2020. The remaining two static pile load tests were bi-directional tests that used an Osterberg ("O") cell. For both types of static pile load tests the results were in good agreement with each other. Comparing the top-down static pile load test results, the ratio of the load in the former to the load in the latter was 1.1 at fixed settlements based on the standard methods tested. Four empirical methods were next applied to the results of these tests and the resulting ultimate capacities compared against the results of the aforementioned four static pile load tests.

An approximate numerical analysis of rafts and piled rafts foundation

Mon, 21 Jul 2025 04:06:39 GMT

title: An approximate numerical analysis of rafts and piled rafts foundation abstract: The load distribution and deformation of rafts and piled rafts were investigated by an analytical and numerical studies. Special attention is given to the improved analytical method (MEGA piles) proposed by considering raft-pile flexibility and soil-pile nonlinearity. The response of raft, a three-dimensional, thin-plate substructure that bears on the soil, is analyzed by flat shell approach by combining a membrane element with a Reissner-Mindlin plate element. An improved analytical method is also developed for the design of piled raft. A series of numerical analyses on piled raft were performed for different head connected conditions, asymmetric geometry of raft, raft flexibility, pile diameters. The proposed method has been verified by comparing the results with other numerical methods and a field case study. Through comparative studies, it is found that the proposed method represents a significant improvement in the prediction of piled raft load sharing and settlement behavior.

A two-dimensional hyperbolic spring model for mat foundation in clays subjected to vertical load

Mon, 21 Jul 2025 04:06:36 GMT

title: A two-dimensional hyperbolic spring model for mat foundation in clays subjected to vertical load abstract: This study proposes a two-dimensional hyperbolic soil spring model for mat foundations in clays subjected to vertically uniform loads to simplify the complexity of three-dimensional finite element analysis on mat foundations. The solutions from three-dimensional finite element analysis were examined to determine the hyperbolic model parameters of the soil springs underneath the slab. Utilizing these model parameters, normalized functions across the middle section of the mat were obtained. The solutions from the proposed model, along with the approximate finite difference analysis of the mat in clays under vertical load, were found to be consistent with those from the three-dimensional finite element analysis. The authors conclude that the proposed method can serve as an alternative for the preliminary design of mat foundations.

Dimensionless reaction coefficients for embedded piled raft foundations in soft clays under vertical loads

Mon, 21 Jul 2025 04:06:33 GMT

title: Dimensionless reaction coefficients for embedded piled raft foundations in soft clays under vertical loads abstract: Although three-dimensional finite-element analysis has been introduced to foundation design for years, simplified computer-based calculations based on the spring analogy of soils and structural elements are also frequently used in many engineering projects. Using coefficients of subgrade reactions and pile stiffness is a straightforward way to design and analyze a piled raft foundation. This paper discusses the determination of the coefficients of pile reactions for embedded piled raft foundations in soft clays subjected to vertically uniform loads through a series of finite-element analyses. The geologic property was assumed to be composed of homogeneous soft clays with the shear-wave velocities varying at 100–140 m/s. The foundations with a square raft ranging from 16 to 36 m and embedment depths of 8 and 12 m were studied. Load intensity approximating 1.5 times the excavated soil pressures was considered where the maximum uniform load was applied to the foundation. The foundation settlements and reactions of the piles were obtained first from a three-dimensional finite-element analysis. For design convenience, the dimensionless pile displacements, pile reactions, and coefficients of pile reactions were developed and presented in plots. The embedment depth-to-raft size ratio, pile slenderness ratio, and pile-to-pile spacing distance-to-pile diameter ratio were examined to find their optimized correlation. Finally, a design example was given to verify the proposed suggestions. We conclude that the proposed method can be an alternative to the piled raft foundation design.

營建工地影像生成文字摘要系統之開發與應用：以工地安全缺失摘要生成為例

Mon, 21 Apr 2025 04:05:39 GMT

title: 營建工地影像生成文字摘要系統之開發與應用：以工地安全缺失摘要生成為例 abstract: 本研究開發了一套基於生成式人工智慧的「營建工地影像生成文字摘要系統」，透過整合多模態模型、大語言模型和圖像檢索 RAG 技術，實現工地安全影像的智能分析與管理。研究團隊建立了包含1,373筆的工安缺失影像資料集，並開發出能自動分析工地照片並生成專業摘要的AI引擎，該引擎可產生包含場景描述、工安缺失、造成原因以及違反法規等完整資訊。系統採用台灣本土優化的 Llama-3-Taiwan 作為大語言模型，結合圖像檢索 RAG技術提升專業知識的準確性。實測結果顯示，系統在場景描述正確性及缺失內容正確性方面表現優異，特別是在法規檢索方面較其他AI 模型展現出顯著優勢。研究成果不僅提供了便捷的工地影像管理與分析工具，更為工程知識的累積與傳承提供創新解決方案。透過API 的佈署，本系統可與既有的工地管理系統整合，為推動智慧工地的發展奠定重要基礎。

砂土地盤樁筏基礎之土壤反力係數和基樁勁度研究

Thu, 20 Mar 2025 04:09:59 GMT

title: 砂土地盤樁筏基礎之土壤反力係數和基樁勁度研究

以新聞採編工作坊輔助營建管理教學之研究

Thu, 20 Mar 2025 04:09:55 GMT

title: 以新聞採編工作坊輔助營建管理教學之研究 abstract: 本研究主要探討以新聞採編工作坊輔助營建管理教學之研究成果。研究動機在於營建管理課程較抽象，需要大量閱讀理解，但近年學生閱讀能力普遍下降，因此教學存在困境。為此，研究引入課後學習的新聞採編訓練課程模組，透過報導寫作訓練提升學生資料收集及寫作能力。研究設計包含新聞採編訓練課程模組、營建管理學習成效評量量表等。教學過程分三階段進行：首先學生自主學習新聞採編知識，接著舉辦模擬編輯會議確認報導觀點，最後學生撰寫土木新聞專題並發表。研究結果顯示新聞採編訓練課程可行，對營建管理學習成效有正面幫助。問卷資料顯示學生在工程專案規劃與敘事能力等方面有所進步。整體而言，新聞採編訓練可提升學生資料收集與寫作能力，有助營建管理學習，但培養閱讀敘事力仍需長期訓練。本研究為營建管理課程提供創新教學模式，而教學過程、學生的回饋及教學成效也給予教師對於課後自主學習的教學方法和策略更深刻的體會與反思。

鋼構吊裝混合實境多人連線演練系統研發

Thu, 20 Mar 2025 01:32:51 GMT

title: 鋼構吊裝混合實境多人連線演練系統研發 abstract: 本研究旨在開發一套「鋼結構吊裝作業多人連線演練系統」，以提升混合實境技術在營建工程現場應用的可行性，並探討其潛在挑戰。該系統透過虛實整合的數位手段，模擬鋼結構吊裝作業，讓多位使用者能同時參與，進行協同操作與演練。此系統的設計考量了現場實際操作需求，旨在提供一個安全且高效的訓練環境，讓施工人員熟悉吊裝流程，提升團隊協作能力，並減少實際操作中的風險。此外，透過混合實境技術，使用者可以在虛擬環境中體驗真實的施工場景，進一步理解各項操作細節。本研究的成果顯示，該系統在提升施工人員技能培訓方面具有顯著成效，為未來混合實境技術在營建領域的應用提供了實質參考。

Determination of Multiple-target Equivalent Static Wind Load of Large-span Roof Structures based on Clustering Analysis Techniques

Thu, 20 Mar 2025 01:32:47 GMT

title: Determination of Multiple-target Equivalent Static Wind Load of Large-span Roof Structures based on Clustering Analysis Techniques abstract: Spatial structures in modern society exhibit a city’s distinguishing features and show its strength in building technology. Large-span roof structures are mostly seen among spatial structures for various activities. Large-span roof structures are usually sensitive to wind loads due to their lightness in materials and curved geometric appearance. However, spatial structures are generally designed with many structural members, making it challenging to determine adequate load distributions for structural safety analysis. This paper intends to introduce the concept of the multiple-target equivalent static wind loads and to demonstrate how to reduce the heavy computational burden when the structural designer needs to consider multiple loading effects of the target structure. The wind tunnel test of an elliptical-shaped stadium structure with a flat roof is first conducted to show the fundamental aerodynamic characteristics. The methodologies of the background-component wind force based on the load-response-correlation (LRC) method and the resonant-component wind force based on the inertial force method are then introduced for the specification of single-target equivalent static wind loads. Finally, the clustering analysis technique is adopted to explain the concept of the multiple-target equal static wind loads. A decay index is proposed to indicate how the clustering technique improves the specification of equivalent static wind loads.

液化地盤之樁筏基礎性能分析

Tue, 08 Oct 2024 04:07:35 GMT

title: 液化地盤之樁筏基礎性能分析 abstract: 本文旨在說明地工構造性能設計和位移性能分析方法，並以液化地盤之低矮建物基礎為例，藉有限元素分析說明基礎和地盤在地震作用下之位移性能。研究顯示低矮建物筏基可抑制其下方淺層地盤土壤液化行為，但將增加兩側地盤變形和位移，樁筏基對基礎下方土壤液化抑制效果更為明顯，但地盤位移變化複雜，須仔細評估；對筏基而言，增加版寬有利於耐震性能，但荷重和埋深等影響效應則未定；樁筏基的樁長和樁數增加均有利於基礎性能。除水平地震力外，垂直向地震力影響相當明顯，特別是近斷層場址基礎之分析必須加以考量。

節瘤型土釘抗拉拔力之實驗觀察

Fri, 20 Sep 2024 04:10:07 GMT

title: 節瘤型土釘抗拉拔力之實驗觀察

地震下地層液化對低矮建物直接基礎影響評估

Fri, 20 Sep 2024 04:09:59 GMT

title: 地震下地層液化對低矮建物直接基礎影響評估

埋深對垂直載重樁筏基礎之基樁位移和反力影響

Fri, 20 Sep 2024 04:09:55 GMT

title: 埋深對垂直載重樁筏基礎之基樁位移和反力影響

砂土地盤樁筏基礎之土壤反力係數和基樁勁度研究

Fri, 20 Sep 2024 04:09:52 GMT

title: 砂土地盤樁筏基礎之土壤反力係數和基樁勁度研究

THE EFFECTS OF LOW RISE BUILDING MAT ON LIQUEFIABLE SITE

Fri, 20 Sep 2024 04:09:48 GMT

title: THE EFFECTS OF LOW RISE BUILDING MAT ON LIQUEFIABLE SITE abstract: The effects of low-rise building mat on liquefiable site were investigated in this study. One-dimensional ground response analyses of a layered sand model profile were conducted using Midas. The UBCSand soil model was used. The excess pore water pressure and the stress/strain time histories as well as the ground deformation of the numerical model were examined. With the comparison of the free-field solutions, if the liquefaction occurred, the mat can cause the subsoils to settle more and push the side soils to move laterally, which will yield sway motions of the mat. The deeper embedment of the mat sometimes would help to minimize such phenomenon.

Verification of piezo drive cone data against standard penetration and cone penetration tests: a case study in Taiwan

Fri, 13 Sep 2024 04:05:50 GMT

title: Verification of piezo drive cone data against standard penetration and cone penetration tests: a case study in Taiwan

Influence of bidirectional shaking on pore water pressure generation for liquefaction triggering evaluation

Fri, 13 Sep 2024 04:05:46 GMT

title: Influence of bidirectional shaking on pore water pressure generation for liquefaction triggering evaluation abstract: Over the past years, prior research has shown that bidirectional horizontal shaking can increase seismic settlements in dry sand, the buildup of excess pore water pressures in saturated granular soils, and the liquefied depth. However, the state of practice for either simplified liquefaction triggering procedures or numerical/experimental seismic simulation is typically for one-dimensional (1D) conditions, without considering the impact of bidirectional horizontal shaking on soil deposits with stratigraphic variabilities. In this paper, three-dimensional (3D), fully-coupled, nonlinear finite element analyses are used to evaluate how bidirectional horizontal shaking affects the seismic response of layered liquefiable soil deposits. The two horizontal components of each selected motion were rotated to find the maximum rotated (RotD100) peak ground acceleration (PGA). The two horizontal components and the RotD100 component were subjected to the base of each 3D soil column model, to represent the site response analysis under bidirectional (BD) and 1D shaking, respectively. The numerical results showed that the BD shaking and pore water pressure migration increased the excess pore water pressure (EPWP) buildup in soils, particularly for medium-dense and dense soils. This led to an increase in liquefied depth when the soil deposits were under moderate-intensity shaking, as compared to the model under 1D shaking or evaluated by the simplified liquefaction triggering procedure. For the case considered, the BD shaking amplified the maximum excess pore water pressure ratio by about 1.3 times on average (with a standard deviation of 0.3) compared to that under 1D shaking, particularly for PGA ranging from 0.002~0.3g. However, the impacts of BD shaking on the EPWP generation became minor when PGA was greater than 0.3g. These results indicated that the impact of bidirectional shaking on the seismic response of porous media must be considered with extreme care when assessing the risk of liquefaction.

Assessments of dimensionless pile stiffness for embedded piled raft foundations in soft clays under vertical loads

Fri, 13 Sep 2024 04:05:42 GMT

title: Assessments of dimensionless pile stiffness for embedded piled raft foundations in soft clays under vertical loads abstract: Three-dimensional finite element analysis has been widely used in foundation design. For the efficiency of computations, simplified analysis treating the soils by series of springs were suggested in many design practice. For piled raft foundation, the coefficients of subgrade reactions and the pile stiffness are thus important to the design analysis. This paper intends to discuss the values of coefficients of pile reactions and/or pile stiffness for the embedded piled raft foundations in soft clays subjected to vertical uniform loads. Dimensionless pile displacements, pile reactions, and coefficient of pile reactions were suggested. Their correlations with the ratio of foundation embedment depth to raft size, the slenderness ratio of pile, and the ratio of pile-to-pile spacing distance to pile diameter were examined. Finally the optimized correlation diagrams were reported while a simple modelling was able to verify the suggestion.

Dimensionless modulus of subgrade reaction for embedded mat foundation in soft clay under vertical load

Fri, 13 Sep 2024 04:05:39 GMT

title: Dimensionless modulus of subgrade reaction for embedded mat foundation in soft clay under vertical load abstract: The dimensionless modulus of the subgrade reaction for embedded mat foundation in soft clays under the vertical load is suggested in this paper using 3D FEM analysis and the Mohr-Coulomb soil model. Besides the soil stiffness, the embedded depth and width of the raft, the depth of diaphragm wall, and the total structural loads were considered as influence factors. For applications to routine designs, foundation displacement, soil reaction, and modulus of subgrade reaction were examined by their non-dimensional measures. The optimized correlations with the foundation geometries are suggested based on various soil stiffness and structural load.

Developing a two-dimensional nonlinear vertical spring model for mat foundation in clays using hyperbolic function

Fri, 13 Sep 2024 04:05:35 GMT

title: Developing a two-dimensional nonlinear vertical spring model for mat foundation in clays using hyperbolic function abstract: A two-dimensional nonlinear soil spring model for mat foundation in clays is introduced in this paper. Hyperbolic function was used to model the nonlinear load-displacement relationships of the mat. The solutions from three-dimensional finite element analysis were analyzed to find the model parameters of the soil springs underneath the slab. Using the normalized functions of the model parameters across the mat, the two-dimensional modelling of the soil springs was suggested. The solutions from the proposed model with the finite difference analysis were found agreeable to the three-dimensional finite element analysis.

Exploring the growth value equity valuation model with data visualization

Tue, 03 Sep 2024 04:05:54 GMT

title: Exploring the growth value equity valuation model with data visualization abstract: The Growth Value Model (GVM) proposed theoretical closed form formulas consisting of Return on Equity (ROE) and the Price-to-Book value ratio (P/B) for fair stock prices and expected rates of return. Although regression analysis can be employed to verify these theoretical closed form formulas, they cannot be explored by classical quintile or decile sorting approaches with intuition due to the essence of multi-factors and dynamical processes. This article uses visualization techniques to help intuitively explore GVM. The discerning findings and contributions of this paper is that we put forward the concept of the smart frontier, which can be regarded as the reasonable lower limit of P/B at a specific ROE by exploring fair P/B with ROE-P/B 2D dynamical process visualization. The coefficients in the formula can be determined by the quantile regression analysis with market data. The moving paths of the ROE and P/B in the current quarter and the subsequent quarters show that the portfolios at the lower right of the curve approaches this curve and stagnates here after the portfolios are formed. Furthermore, exploring expected rates of return with ROE-P/B-Return 3D dynamical process visualization, the results show that the data outside of the lower right edge of the “smart frontier” has positive quarterly return rates not only in the t + 1 quarter but also in the t + 2 quarter. The farther away the data in the t quarter is from the “smart frontier”, the larger the return rates in the t + 1 and t + 2 quarter.