大跨径劲性骨架钢筋砼拱桥拱脚、拱座局部应力分析

结合宜万铁路上一座大跨径劲性骨架钢筋砼拱桥的拱脚，对比了不同结构形式的拱脚构遣。并以莱一在建桥梁的拱脚和拱座为例，介绍了进行有限元局部分析时的两步分析法的优点及具体思路，采用大型通用工程软件用两步分析法计算分析了拱脚和拱座的局部应力分布特征及其传力特性，对该拱脚和拱座的结构构造及其细节的合理性作出了分析和综合评价。结果表明：拱脚刚度缓慢过渡可以迅速降低集中应力峰值，保障传力顺畅；该拱脚和拱座结构受力状态安全，其结构构造可被借鉴应用于美似桥梁的工程设计中。

Local Stress Analysis of Arch-foot and Skewback of Large Span SRC Arch Bridge

Combined with a large span SRC arch Bridge on Yichang-Wanzhou Railway,structures of different arch-foots were discussed.And taking bridge as an example,the advantages and idiographic way of two-step analysis method in local finite element analysis were under construction introduced.Local stress distribution of the arch-foot and the skewback were studied with the two-step analysis method.And the rationality of the structure was appraised.The analysis results show that the slower the arch-foot stiffness is changed,the lower the peak stress;in addition,the structure of the joint is reasonable,the stress state is safe,and the structure can be used in similar bridge's design.