基于退化模型的既有旧桥加固改造承载潜力分析

Load Carrying Capacity Analysis for Improvement of Existing Bridge Based on Deterioration Model

以空间梁格有限元理论为基础,根据桥梁检测和荷载试验的实测数据,对桥梁结构有限元模型的主要参数进行修正,建立能够反映既有桥梁实际结构特性的退化模型;基于退化的有限元模型,通过对桥梁加固前后的跨中挠度及荷载横向分布的计算,分析桥梁加固改造后的承载潜力;同时以枯河中桥为例进行仿真分析,结果表明,加固改造后的结构整体承载能力得到显著提高,退化模型可用于评估既有桥梁加固的效果。

According to the data of bridge detection and load testing, the main parameters of the finite element model of bridge are revised and a bridge deterioration model, that can reflect the real structural characteristic of existing bridge on the basis of space finite element theory, is established. Based on the finite element model, the mid-span deflection and transverse load distribution factor before and after strengthening are are analyzed. Simulation analysis been significantly improved after effectiveness of existing bridge＇s calculated and the load carrying capacity of bridge after strengthening indicates that the overall carrying capacity of bridge construction has strengthening and the deterioration model can be used to assess the strengthening.