基于静载试验的某跨铁公路桥梁受力性能研究

Research on Mechanical Performance of a Highway Bridge Across a Railway Based on Static Load Test

以某跨铁公路桥梁为对象,设计了静载试验加载方案。在试验过程中,采用静态应变采集系统、应变片测试结构应变;使用拉线式电子位移计测量结构的挠度值。试验结果分析表明,测点实测应变值均小于理论计算值,实测应变校验系数均<1,该截面实际工作状态优于设计状态,静力强度满足要求。试验荷载卸除后,空心板梁主要测点残余应变较小,残余应变率均<20%,表明结构处于弹性工作状态。跨中挠度主要测点实测挠度值均小于理论计算值,实测挠度校验系数均<1,板梁刚度满足要求。该分析方法可供其他相关工程参考。

Took a highway bridge across a railway as the object,we designed the static load test loading scheme.In the process of the test,the static strain collection system and strain gauge were used to test the structural strain,and the pull wire electronic displacement meter was used to measure the deflection value of the structure.The results of the test showed that the measured strain values of the test points were less than the theoretical calculation values,and the measured strain calibration coefficients were less than 1,which indicated that the actual working state of the section was better than the theoretical state,and the static strength met the requirements.After the test load was removed,the residual strain of the main test points of the hollow slab beam was small,and the residual strain rate was less than 20%,which indicated that the structure was in elastic working state.The measured deflection values of the main measuring points of midspan deflection were less than the theoretical calculation values,and the measured deflection calibration coefficient was less than 1 and the rigidity of the plate beam met the requirements.The analysis method could be used for reference in other projects.