基于位移自适应能力谱Pushover方法  

Displacement based adaptive capacity spectrum Pushover procedure

作　　者：李玲[1] 金松[2] 徐亚丰[2] Li Ling;Jin Song;Xu Ya-feng(Hubei University of Science&Technology,Xianning,437100,China;School of Civil Engineering,Shenyang Jianzhu University,Shenyang 110168,China)

机构地区：[1]湖北科技学院,湖北咸宁437100 [2]沈阳建筑大学土木工程学院,辽宁沈阳110168

出　　处：《工程抗震与加固改造》2020年第2期19-27,共9页Earthquake Resistant Engineering and Retrofitting

基　　金：湖北省教育厅科学技术研究项目(B2018182)。

摘　　要：为改善Pushover方法预测效果,本文提出一种基于位移自适应能力谱Pushover方法。这种方法吸收了基于位移自适应Pushover算法、N2法以及能力谱方法的优势,引入了自适应能力谱特性。同时该方法可以高阶振型影响以及结构屈服以后侧向力分布的变化,也能反映结构瞬时变形状态的影响。为了评价该种方法的预测效果,以两个高层钢框架为例,采用Opensees软件进行Pushover分析以及弹塑性时程分析,将本文提出的方法计算结果与模态Pushover方法,基于力的自适应Pushover方法以及弹塑性时程分析的计算结果进行比较。结果表明:各种Pushover方法对楼层位移的预测效果明显好于层间位移角,基于位移自适应能力谱方法对预测楼层位移以及层间位移角预测效果误差指标小于其他Pushover方法,因此本文提出的这种方法可以有效改善目前Pushover方法预测性能。To improve accuracy of Pushover method,displacement based adaptive capacity spectrum Pushover analysis procedure is presented.The merits of displacement based Pushover algorithm,N2 method are used,and CSM method and the adaptive capacity spectrum characteristic is introduced.At the same considering the effect of higher modes,lateral load distribution change after structure yield,it also can reflect instant deformation status of structures.To evaluate the prediction effects of this method,take two high-rise steel frame as case,Opensees software is used to carry out Pushover analysis and elasto-plastictime history analysis.The calculation results of the proposed method are compared with the modal Pushover method,the force-based adaptive Pushover method and the elasto-plastic time history results.The results indicate that the prediction effect of various Pushover methods on floor displacement is significantly better than the story drifts.The error indices of floor displacement and story drift prediction effects based on the displacement based adaptive capacity spectrum Pushover procedure is much lower than other Pushover methods,the proposed procedure in this paper can enhance the performance of the current Pushover method.

关 键 词：PUSHOVER 自适应能力谱 目标位移 高阶振型 弹塑性时程分析 楼层位移 层间位移角 

分 类 号：TU311.4[建筑科学—结构工程]