增量动力分析法在预压装配式PC框架结构中的应用

Application of Incremental Dynamic Analysis on Pre-stressed Fabricated PC Frame Structure

为考察预压装配式PC框架结构的抗震性能,本文采用增量动力分析(IDA)来考虑地震动的不确定性,以工程中常用的最大层间位移角作为结构性能参数、地面峰值加速度作为地震动强度参数,利用有限元软件SAP2000建模,并采用非线性LINK单元模拟塑性铰的方式考虑结构构件的非线性属性,通过对某7层预压装配式PC框架进行IDA分析,得到一系列IDA曲线,然后对这些曲线进行汇总分析得到该结构概率分位值为16%,50%和84%的IDA曲线,并确定各曲线上对应的极限状态点。把IDA方法引入到地震易损性原理中,得到该结构的地震易损性曲线,并对结构的易损性进行了分析和评估。通过对本文算例的分析,可以为增量动力分析以及地震易损性分析在同类结构中的应用提供参考。

In order to investigate the seismic performance of pre-stressed fabricated PC frame structure, incremental dynamic analysis （IDA） is used to consider the uncertainty of ground motion, in engineering, the maximum story drift is commonly used as the performance parameters of the structure, and the peak ground acceleration is used as intensity of earthquake ground motion parameters. In this paper, take a 7 story assemble PC frame structure as an example, finite element analysis software SAP2000 is used to eslablished model, and the nonlinear link element simulation of plastic hinge way is applied to consider the nonlinear properties of structural members. The IDA curves are gotten by several nonlinear dynamic time history analysis, and then the IDA curves of the structure probability value with 16%, 50% and 84% are derived, and the corresponding limit state points on the curve are determined. Then the seismic fragility curves of the structure are obtained by introduce the IDA method to the principle of seismic vulnerability, the vulnerability of the structure and performance are analysed and evaluated. Through the analysis of the example, it can provide reference for incremental dynamic analysis and seismic vulnerability analysis in similar structures.