连续梁桥荷载试验梁格法分析

Analysis of Load Tests for Continuous Girder Bridge with Grillage Theory

研究目的:桥梁荷载试验是鉴定桥梁承载能力、评估桥梁现状的重要手段。用合理的计算方法进行结构分析尤为重要。本文利用梁格法建立模型,通过连续梁桥荷载试验分析,探讨桥梁荷载试验计算和成果分析中存在的问题。研究结论:通过工程实践,经过梁格法有限元计算所得的结果与实际试验结果进行对比分析,得出梁格法可以有效地实现荷载试验所需的结构构件的内力和挠度状态,并总结了梁格法建模时横梁的联结方法。同时指出,二期恒载对结构的影响程度不容忽视。利用本方法进行的荷载试验计算值与试验值比较吻合,其结果对类似工程有一定指导意义。

Research purposes：The load test is a very important means of verifying the load bearing capacity and evaluating the current situation of bridge.Application of the appropriate calculation method is crucial to the structure analysis.Based on the analysis of the load test for continuous girder bridge,this paper discusses the load test calculation and points out the problems in analysis of the calculation result by using the model established with Grillage Theory. Research conclusions：From the application practice in engineering and comparing the calculation result obtained with Grillage Theory with the actual test result it is concluded the internal force and deflection needed in the load test can be realized by using Grillage Theory.The connection method of the cross beam is offered when establishing the model with the Grillage Theory.Finally,it points out that the impact of secondary dead load on the structure can not be ignored.The calculation values of the load test with this method fit to the tested values and it can provide the reference to the similar works.