基于监测系统的自锚式悬索桥快速试验评估

为实现既有特殊结构桥梁承载能力快速化试验评估,以一座在役自锚式悬索桥为研究对象,通过实桥有限元数值模拟,分析加劲梁内力、变形随荷载变化关系,利用既有监测系统并结合准静态荷载试验方法进行现场快速试验,获取应力、挠度影响线,进而推算最大加载荷载效应,并与常规荷载试验结果进行了对比分析。结果表明:对于此类中小跨径自锚式混凝土悬索桥,结构几何非线性影响很小,加劲梁内力、变形与荷载大小基本呈线性关系,快速试验推算结果与常规静载试验结果偏离不大,快速试验可以在一定程度上替代常规静载试验为该类型桥梁承载力评定提供依据。

Rapid Test Evaluation of Self-anchored Suspension Bridge Based on Monitoring System

In order to carry out the rapid test evaluation for bearing capacity of existing special bridge,a municipal self-anchored suspension bridge in service was studied.By f inite element simulation,the relationships between internal force and deformation of stiffening girder and load were analyzed.The f ield rapid test was carried out by using the existing monitoring system and quasi-static load test method.The inf luence lines of stress and def lection were obtained,and then the maximum load effect was calculated.The f ield rapid test results were compared with the conventional load test results.It is concluded that for the self-anchored concrete suspension bridges with small and medium spans,the geometric nonlinearity of the structure has little effect,and the internal force and deformation of the stiffening girder are basically linear with the load.The calculated results of the rapid test deviate little from the results of the conventional static load test.The rapid test can replace the conventional static load test to some extent,which can provide a basis for the bearing capacity evaluation of this type of bridge and be used to as an effective supplementary means for the later evaluation of bridge bearing capacity.