樁基礎常用於軟弱地盤、橋樑和輸電設施等結構,其能有效的提昇基礎承載力和結構物耐震抗風能力。在例行的工程設計中,分析樁基礎的軟體仍多以靜力為主,基樁之動力行為則有賴於有限元素分析法,然由於該項方法相對複雜,資料準備和輸入均不易,故亦未能被普及運用;鑑於此,發展一簡明易於執行的動力分析軟體遂有其必要性。本文將說明是項分析所採用的數值方法,研究係以VB作業平台建構PC版視窗軟體,並以ASP程式語言開發網際版程式,同時使用VRML語言和WebChart3D軟體進行繪圖,以使結構系統特性和基樁變形、彎矩和剪力等分析結果均能顯示於視窗之中。 Pile foundations are often used in soft soils, bridge structures and electricity facilities; it can effectively improve the bearing capacity of the foundation and the capability of structural resistances to earthquake and wind hazard. In routine design work, the pile foundations analyses are mostly the static ones. Dynamic analysis is typically conducted with the finite element method. Owing to the complexity of this method and the time need for preprocess, the finite element analysis has not been adopted frequently in practice. Therefore to develop a more simplified but effective method is in demand. This paper presents the numerical method of a newly developed windows-based program, in which the Visual Basic software platform and the ASP computer language were used to establish PC and internet versions, respectively. Using the VRML code and WebChart3D package, the visual design module has been developed for analyzing deformations, moments and shears of the pile foundations.