大跨连续刚构桥跨中下挠敏感性分析

Sensitivity Analysis for Mid-span Down Deflection of Long Span Continuous Rigid Bridge

目前大跨连续刚构桥存在的主要问题是跨中下挠和结构开裂。引起跨中下挠的成因十分复杂,往往是多种因素相互耦合,很难精确计算。运用敏感性分析理论和模拟分析的方法,对影响跨中下挠的各参数进行敏感性分析,主要包括结构的开裂、预应力损失、超载等,得出相关结论。

At present,the main problems existed in long span continuous rigid bridge are mid-span down deflection and structure crack.The causes inducing mid-span down deflection interact each other which is hard for accurate calculation.In this article,the authors analyze sensitivity of some parameters on mid-span down deflection of this bridge by sensitivity theory and simulation analysis method,and some conclusions are taken.These parameters include crack,prestress loss and overloading.