中文摘要：

提出一套便于工程技术人员使用的扁壳桥结构空间分析与计算方法．引入壳体基本微分方程，推导出扁壳结构的等效刚度系数及梁格分析的截面特性，利用有限元程序直接计算壳体内力，根据程序计算结果进行承载力检算，提高扁壳桥结构分析的工作效率．研究结果表明，扁壳结构可以采用梁格法进行空间效应分析；与板壳法相比，梁格法计算效率高，且精度满足工程需求．

英文摘要：

A set of spatial analysis and calculation method of flat shell bridges was presented wmcn was easy to use for common engineers. A basic differential equation of the shell was introduced. The equivalent stiffness of the shell structure and beam cross-section characteristics for beam-grid analysis were derived. The shell internal force was directly evaluated by using a finite element program, and the checking of the bearing capacity was conducted accordiong to its results, so that the efficiency of analysis of the flat shell bridge was improved. The result of investigation showed that the spatial effect analysis could be performed by using beam grillage method for the flat shell structure. Compared with the shell method, the beam-grid method had higher computational efficiency, and the accuracy of the latter met the engineering requirement.