基于曲率和应变破坏的大跨刚构桥IDA分析

Incremental Dynamic Analysis of Long Span Continuous Rigid Frame Bridges Based on Destruction of Curvature and Strain

基于北盘江特大预应力混凝土斜腿刚构桥,采用SAP2000建立杆系及杆系-纤维有限元模型,分别以截面曲率和材料应变为损伤指标,采用增量动力分析法(IDA)对结构进行地震响应分析,得到曲率IDA曲线和钢筋、混凝土应变IDA曲线,并对比两类指标的破坏PGA值。结果表明,以材料应变为损伤指标的分析方法结果是准确的,杆系-纤维模型能同时保证计算效率和结果的精确性,适用于实际工程。

Based on Beipanjiang concrete rigid frame bridge, SAP2000 is used to establish rod model and rod-fiber model. According to the damage index of curvature and strain respectively, seismic response analysis is performed using Incremental Dynamic Analysis （IDA） , and curvature-IDA curves and strain-IDA curves are obtained. Damage PGA of the two damage indexes is compared. It proves that the method based on strain is accurate and the rod-fiber model is applicable to practical engineering.