改进梁格法在既有双幅简支T梁结构分析中的应用

Application of an Improved Grillage Simulation in Structural Analysis of an Existing Double Carriages Simply-supported T Beam

传统的梁格法难以考虑左右幅简支T梁桥因桥面铺装横向连续作用下的荷载传递问题。从桥面铺装的横向荷载传递机理出发,研究了荷载沿桥面铺装的横向传递过程,提出了一种改进的梁格法。在传统的空间梁格模型中加入板单元来模拟桥面铺装,通过梁单元与板单元节点间合理的约束耦合来模拟荷载横向传递。通过对某一既有双幅简支T梁桥进行实桥建模受力分析和静载试验,并对理论值和实测值进行对比分析,得出了与实际情况较为符合的结论、验证了改进梁格法的正确性,可为同类型桥梁分析提供参考。

It was difficult for the traditional grillage simulation to analyze the load transfer problem of the double carriages simply-supported T beam,because of lateral continuity deck.On the basis of that,this essay got started from the lateral load transfer theory,researched the course of load transferring along the bridge deck and proposed an improved grillage simulation,which simulated bridge deck by using plate element added into the space grillage model and built up the rational constraint couple of the nodes between beam and plate elements to simulate the load lateral transfer.Through a structural analysis and static load test of an existing double carriages simply-supported T beam bridge,and the comparative analysis of theory and test results,it can conclude that the method of essay is according with the actual situation and prove the correctness of improved grillage simulation,which can give reference for the same type bridge.