中文摘要：

为了准确把握刚性悬索加劲钢桁梁桥在施工阶段及运营阶段内力和线形的变化,以中国首座刚性悬索加劲钢桁梁桥——东江大桥为例,采用大型有限元计算程序,建立了三维空间有限元模型.运用仿真分析方法,对该结构受力特性进行了相应的研究,得出结构自重、结构刚度、支座强迫位移、温度变化、刚性悬索线形误差等敏感参数对该桥内力及线形的影响规律.结果表明：支座强迫位移、结构刚度、结构自重误差对主桁线形和内力影响较大;温度变化和刚性悬索线形误差对主桁线形及内力影响较小,所得结果可为大桥施工控制提供参考.

英文摘要：

In order to accurately grasp the variation situations of internal forces and deflection for steel truss bridge stiffened with rigid cable during the construction phase and running stage,and study the mechanical characteristics of this type of bridge,the Dongjiang Bridge in Dongguan,which is the first steel-truss bridge stiffened with rigid cable,was taken as the studying case.A three-dimensional space finite element model was built with the large-scale finite element calculation program.The related research were carried on the structure by computer simulation analysis method.The influence rules and levels of the bridge static characteristics were obtained,which were affected by the sensitivity parameters,such as self-weight,stiffness,forced-deflection of the bearing,the variation of temperature,the shape residual of rigid cable and so on.The results showed that the stiffness of structure,the self-weight of sections and the forced deflection of bearing had a greater impact on the internal forces and line shape of main truss;but the variation of temperature and the shape residual of rigid cable had a smaller affection on deflection and internal forces of main truss.These results we have got can provide reference for the construction of the bridge.