主跨1216 m斜拉桥试设计及静动力性能分析

Trial design and analysis of static and dynamic performance of cable-stayed bridge with main span of 1216 m

进行一座主跨1 216 m斜拉桥的方案试设计,采用MIDAS/Civil建立了包含详细施工阶段的有限元分析模型。静力性能方面,对施工阶段的应力、变形和稳定性进行了分析,对合理成桥状态进行了验证,对运营阶段的汽车荷载、风荷载、温度荷载、基础变位进行了计算分析,对最不利荷载组合下的强度、刚度以及全桥满布活载下的静力稳定性进行了验算,对活载的几何非线性效应进行了研究;动力性能方面,采用Lanczos法计算了桥梁的动力特性,采用半逆解法对颤振稳定性进行了分析。研究结果表明,该方案是可行的,静动力性能均满足要求,研究结果可以为超大跨度斜拉桥的设计提供参考。

A trial design of a cable-stayed bridge with a main span of 1216 m was carried out,and a finite element analysis model including detailed construction stages was established using MIDAS/Civil.In terms of static performance,the stress,deformation and stability of the construction stage were analyzed,the reasonable bridge state was verified,and the vehicle load,wind load,temperature load,and foundation displacement were calculated and analyzed during the operation stage.The strength and stiffness under the most unfavorable load combination and the static stability of the whole bridge under full live load were checked,and the geometric nonlinear effect of the live load was studied.In terms of dynamic performance,the Lanczos method was used to calculate the bridge dynamics characteristics,using the semi-inverse solution method to analyze the flutter stability.The research results show that the scheme is feasible and the static and dynamic performances meet the requirements.The research results can provide references for the design of super-long-span cable-stayed bridges.