上海一座多联曲线高架桥的分析

本文对上海一座具有悬臂铰节点的多联曲线连续箱形梁桥的可行性方案提出了两种比较实用的分析方法。第一种分析方法系基于曲线薄壁梁的翘曲扭转理论的解析法,第二种为考虑翘曲作用的曲线格子梁理论的刚度法。所得分析结果基本吻合,它表明两种方法的可靠性。两者比较,后者节省机时,应用简捷而且不受支座条件和断面变化的限制,具有更大的适应性和灵活性。本文系国家自然科学基金资助研究项目“大城市高架桥理论分析的研究”的内容。有关的计算机程序现已扩充应用于其它形式的曲线桥梁分析。

METHODS OF ANALYSIS FOR A MULTIPLE CURVED ELEVATED BRIDGE IN SHANGHAI

In connection with a proposed multiple curved continuous box girder bridge with cantilever hinged joints in Shanghai, two practical and efficient methods of analysis have been developed. The first is based on the warping torsion theory of a curved thin-walled girder and the second is based on a refined curved grillage theory with warping effect. A comparison was made between the numerical data of this bridge obtained by the proposed methods. The results are satisfactory and reliable. The methods have a number of advantages. It is simple yet accurate, versatile yet easy to program and to execute. Furthermore, the program can be accomodated on a small computer such as the IBM-PC-XT. This investigation was part of the research project on the theoretical analysis of the elevated bridge in city. The computer program is presently being extended to treat any curved and skew bridges of varying cross section and arbitrary support condition.