以氣動力資料庫建立建築物之風力係數與風力頻譜之擬合公式

淡江大學機構典藏 > 工學院 > 土木工程學系暨研究所 > 學位論文 > Item 987654321/105619

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题名:	以氣動力資料庫建立建築物之風力係數與風力頻譜之擬合公式
其它题名:	The establishment of aero-data based fitting formulas for building wind coefficients and spectra
作者:	許昱斌;Hsu, Yu-Pin
贡献者:	淡江大學土木工程學系碩士班王人牧
关键词:	氣動力資料庫;非線性迴歸;橫風向;扭轉向;風力係數;風力頻譜;Aerodynamic Database;nonlinear regression;Across-Wind;Torsion-wind;Wind Coefficient;Wind Spectrum
日期:	2015
上传时间:	2016-01-22 15:00:44 (UTC+8)
摘要:	現今國內風力規範「建築物耐風設計規範及解說」參照美國ASCE 7-02(2002)與日本AIJ(1996)修訂而成，在使用上有時過於保守，有時又有低估的情形；專家系統採用類神經網路模式，但過程並不透明化且缺乏紙本公式作為依據。本研究利用氣動力資料庫對於橫風向與扭轉向風力設計所需的風力係數及風力頻譜進行擬合，將擬合結果與現行規範以及氣動力資料庫模式進行比較，主要目的為工程上使用時可有較明確之紙本公式做為參考依據。以氣動力資料庫之內容擬合風力係數之擬合公式；考量工程上之使用，轉換無因次化方式，以規範公式內容做為參考擬合規範建議修正式。橫風向風力頻譜參考Clark &Vickery (1972)對於圓形斷面煙囪的橫風向風力頻譜公式進行修改；扭轉向風力頻譜則以順風向風力頻譜與橫風向風力頻譜組合擬合其公式。擬合結果整體尚且優於現行規範本研究以內政部建築研究所於102年度委託研究報告「設計風載重資料庫之應用研究(二)」中所使用之風載重計算模式為本研究之風力計算模式，比較規範與風力係數以規範建議修正式之計算結果以及氣動力資料庫之計算；橫風向設計風載重與扭轉向設計風載重以全部深寬比，高寬比2、3及6之模型計算比較。橫風向設計風載重在180m深矩柱之部分效果不佳，其他案例分析之整體表現皆接近氣動力資料庫之計算模式，扭轉向部分計算較為保守，整體案例分析之結果修正規範不保守之現象。 Taiwan wind code is modified from ASCE 7-02 (2002) and AIJ (1996). In practical use, it sometimes is too conservative and it is not conservative enough for certain cases. Expert system uses artificial neural networks to predict wind coefficients and wind force spectra, but the process is not transparent and lacks formulas. This thesis use the aerodynamic database of Wind Engineering Research Center of Tamkang University to fit formulas for wind coefficients and wind spectra that are required for acrosswind and torsional wind load calculations. The results of wind code and aero-data based calculations are compared with the results of fitting formulas. The objective is to have accurate and explicit formulas for engineering design practices. Regressional analysis was used to find the “fitting formula” of the acrosswind and totional wind coefficients based on the contents of the aerodynamic database.Taking the nondimensionalizing method of engineering practice and form of the original wind code formulas into concideration, “wind code modification formulas” were found later. The pattern used to fit acrosswind spectra was similar to the formula used by Clark & Vickery (1972) for the acrosswind spectra of circular cross-section chimneys. On the other hand, the formula form used for torsional wind spectra was composed using the formula of alongwind and acrosswind spectra.The results are superior to the Taiwan wind code in general. Based on the wind load calculation method in the 2013 ABRI project, Applications of Aerodynamic Database on Building Design Wind Loads (II), the acrosswind and torsional wind loads calculated using the wind code modification formulas are compared with both the aero-data based and wind code calculations. The analized cases cover all the side ratios and aspect ratio 2, 3 and 6. Results of acrosswind wind loads are poor for deep rectangle buildings at 180m. Other cases are close to the aero-data based calculations. As for the torsional wind loads, the calculation results are more conservative. The not conservative problem of the current wind code has been improved in general.
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