宽幅无缝桥梁受力性能分析

无缝桥梁具有行车舒适、维护简单等诸多优点,但由于认识有限且缺乏统一的标准,此类桥梁在我国发展较为滞后。现有的研究关注桥长等限制因素,但对宽幅无缝桥却未见专门的报道。结合某城市立交方案,建立一种适用于工程实践的空间梁格模型,对宽幅整体式桥台无缝桥梁受力特性进行多工况分析,并与半整体式无缝桥梁方案进行了对比。研究结果表明:优化台后填土等设计参数能较大地改善此类桥梁受力性能;受桥宽的影响,桩顶横向弯矩可能控制设计,采用半整体式桥台无缝桥梁方案有利于解决此问题。

Analysis on Stress Performance of Wide Seamless Bridge

The seamless bridge has many advantages of comfortable driving,easy maintenance and etc.This kind of bridge is developed backward because of the limited knowledge and non-unified standard.The present research is for the limitation factor of bridge length,but there is no special study on the wide seamless bridge now.Based on an urban interchange scheme,a spatial beam grid model suitable for the engineering practice is set up to analyze many working conditions of the stress characteristic of wide integral abutment seamless bridge,and the semi-integral seamless bridge scheme is compared.The result shows that the optimized design abutment post-filling parameter can greatly improve the stress performance of this bridge.The transverse moment at the top of pile may control the design because of the bridge width.The semi-integral abutment seamless bridge scheme is favorable to solve this problem.