【摘要】 本文以薄壁曲线梁的翘曲扭转理论和有限元方法为基础,推导了一种考虑翘曲影响的空间曲线箱梁单元。这种箱梁单元除计及曲梁空间6个位移自由度外还增加了一个翘曲位移自由度,用以反映曲线高架箱梁桥的振动。作为应用实例,本文对不同的几种曲线桥型进行了动力特性的分析。文中还讨论了对曲线桥动力特性方面的影响因素,绘出了它们与结构固有频率之间的关系曲线。更多还原

【Abstract】 The purpose of this paper is to present a method of analysis for studyingthe dynamic response of horizontally curved elevated box girder bridges basedon the warping torsion theory of curved thin-walled girder and a refinedcurved grillage theory with warping effect.This method,is simple yet acc-urate,versatile yet easy to program and to execute as to the more complexfinite element method.Application of the method,compared to the othermethods and SAP4,is presented in detail.This study was part of the research project on the theoretical analysisof the elevated bridge in urban area,supported by the National ScienceFoundation.Also included in this paper are various parameters analyses ofdifferent types of curved bridges.更多还原