中文摘要：

为研究刚性铰对多塔钢箱梁斜拉桥温度效应的影响及其局部结构的安全性,以嘉绍大桥主航道桥[（70＋200＋5×428＋200＋70）m的6塔钢箱梁斜拉桥]为背景进行分析。采用不同梁柱连接形式的多跨桥梁简化结构进行力学理论推导,结合全桥结构的有限元模拟和理论验证,分析刚性铰对全桥温度效应的影响。基于有限元模型和实测数据研究嘉绍大桥刚性铰应力分布的合理性及其伸缩滑动状态对局部应力的影响。结果表明：刚性铰的布置可以大幅度降低主梁和桥塔弯矩,降幅与各梁与塔之间的支撑形式以及斜拉索布置有关;局部合理的加劲板布置可以实现和保证刚性铰在钢箱梁中的稳定工作。

英文摘要：

To study the influences of the rigid hinges on the temperature effect of multi-pylon steel box girder cable-stayed bridge and the safety of the local structures of the rigid hinges, the main ship channel bridge [a six-pylon steel box girder cable-stayed bridge with span arrangement （70-1-200＋5×428-1-200＋70） m] of the Jiashao Bridge was selected as an example and was ana- lyzed. The simplified structure of the multi-span bridge having the different beam and column con- nections was used to carry out the mechanics theory derivation and with the aid of the finite ele- ment simulation and theoretic verification of the whole bridge structure, the influences of the rigid hinges on the temperature effect of the whole bridge were analyzed. Based on the finite element model and the study of the measured data, the rationality of the stress distribution of the rigid hin- ges and the influences of the expansion state of the rigid hinges on the local stress were studied. The results show that the arrangement of the rigid hinges can greatly decrease the bending moment of the main girder and pylons of the multi-pylon cable-stayed bridge and the amplitude of the de- crease is associated with the supports of the girder and pylons and with the arrangement of the stay cables. The arrangement of the locally rational stiffening plates can realize and ensure the steady work of the rigid hinges in the steel box girder.