基于准静态荷载试验的梁式桥梁状态快速评定

Fast Appraisal for Girder Bridge Condition Based on Quasi Stationary Load Test

针对当前桥梁结构状态评定中普遍存在的调查、检算方法判别准确性较差,而常规荷载试验方法又费时费力、代价高昂且对正常交通干扰较大的缺陷,提出了基于准静态荷载试验进行桥梁状态快速评定的一般原则与方法,就其参数选择、模型校准等问题进行了探讨,并以盐通高速公路上一座特大跨径连续梁桥为依托,开展了准静态荷载试验和常规静载试验的对比试验和相关分析,为该方法的进一步应用与推广提供了借鉴与参考。

Regarding to condition assessment of bridge carrying capacity, there are two prevalent approaches in recent years,one is visual inspection and theoretical analysis and the other is field load testing.However,the accuracy of the former is low, and the cost and the disturbance to traffic of the latter is high.ln this paper, a fast appraisal approach based on quasi-static load testing is studied, and the fundamental principal and procedure are developed.Furthermore, some key problems such as parameter identification and model calibration are analysed in detail.At last, both quasi-static load testing and conventional load testing are performed to a long span continuous concrete girder bridge in Yah-Tong Expressway,the results of the two methods followed was compared.This study could be refered for further study and application of related approaches.