地震作用特征对结构IDA曲线的影响分析

Investigation for the Characters of Seismic Effect to Incremental Dynamic Analysis Curves

当前IDA曲线离散分析主要采用数值统计方法。为了从受力机理上对IDA曲线差异做出解释,通过反应谱正则化的调幅方法绘制结构等效弹塑性单质点的IDA曲线;并通过对实际结构的IDA曲线适当插值,以结构基底剪力和薄弱层层间侧移角为基准,比较了结构非线性发展沿高度分布特征差异。由此证明IDA曲线差异是由不同地震动的弹塑性谱特征差异以及沿结构高度作用分布特征差异共同构成。本文的分析在数值统计方法之外,形成了对IDA曲线离散特征分析新的分析思路。

Incremental dynamic analysis （IDA） curves for the structure’s equivalent elasto-plastic SDOF was calculated by the response spectra normalized method.The distribution of the structural nonlinear development along the building altitude under the different seismic were compared,when the same base shear force and base story drift angles were given by interpolation to IDA curves.The difference of IDA curves were given,which resulted from the characters of elastoplastic spectrum and the distribution of the earthquake force along the altitude of the building.A new means of analyses for the discrete of IDA curves was presented without the using of statistics.