连续 T 梁桥荷载横向分布有限元与荷载试验对比分析

Contrastive Analysis of Load Lateral Distribution Finite Element and Load Test of Continuous T-beam Bridge

摘要:

使用Midas Civil建立了连续T梁桥的有限元梁格模型，将有限元计算的结果和桥梁实际现场静载试验的实测结果进行了比较分析，得到了粱格模型能够准确地用于分析该类型桥梁的受力情况。同时也对比了在设计活载作用下与单位力作用下利用挠度与应力指标的结果分析跨中荷载横向分布影响线，知道了采用挠度指标的计算结果比应力指标的结果横向分布更加均匀，且通过实桥静载试验的偏载与中载工况结果可知，计算所得的应力(应变)与挠度影响线和有限元计算值的结果比较相似，桥梁的横向刚度较好处于良好的健康状态。

Abstract:

The finite element grillage model of the continuous T-beam bridge is established by Midas Civil. The results of the finite element calculation and the actual field static load test of the bridge are compared and analyzed. It is obtained that the grillage model can be accurately used to analyze the stress situation of this kind of bridge. At the same time, the results of using the deflection and stress indicators under the design live load and the unit force are compared to analyze the influence line of the lateral distribution of mid-span load. It is known that the calculation results of the lateral distribution by using the deflection indicator are more uniform than the stress indicator. It can be seen from the results of the partial load and medium load conditions of the static load tests on full bridge that the calculated stress (strain) is similar to the results of the deflection influence line and the calculated value of the finite element. The lateral stiffness of bridge is good at the excellent health.