某简支组合梁桥荷载试验研究

以某简支组合梁桥为工程背景，基于现场荷载试验方法，对该桥加固后的实际承载力进行了研究。首先，详细介绍了试验过程中应变和挠度测点的布置方式；然后，利用荷载效应等效原则，结合组合简支梁桥结构的内力分布特点，确定了现场荷载试验中典型截面的最不利荷载工况。最后，将试验结果与理论计算结果进行了对比分析。研究结果表明，静载试验的应变实测值和挠度实测值均小于理论计算值，满足相关规范要求；桥梁结构整体强度和刚度满足设计荷载及正常使用的要求；该桥的跨中横向分布系数分布不均匀，且其横向传递剪力能力较弱。

Study on analysis of load tests for a simple supported composite beam bridge

Based on a simply supported composite beam bridge,the actual bearing capacity after reinforcement was studied by field loading test method.Firstly,arrangement of the strain,deflection and model measuring point were introduced.Then,according to load equivalence principle and internal force distribution characteristics,the most unfavorable load layout schemes of a typical section of the bridge were determined.Finally,the measured results and theoretical results were compared and analyzed.Which shows that the measured values of strain and deflection are smaller than the calculated values,and it can meet requirements of specifications.The capacity and stiffness of the bridge meet the requirements of design load and normal use.The transverse distribution coefficient is uneven,and the transverse transfer shear capacity of the bridge is weak.