李永靖，  林宇晗，  郭秋丰
    （辽宁工程技术大学土木与交通学院，阜新 123000）

[摘要] 以振型分解反应谱法为理论基础，改进了考虑高阶振型的Pushover算法水平侧向力分布增量系数。通过算例，与以往的侧向力均匀分布、倒三角分布进行了推覆曲线、层间位移角和层间剪力分析对比，发现均匀分布偏差最大，倒三角分布较小，而改进后的分布偏差最小，证明了改进后的侧向力分布能更好地进行框架结构抗震性能静力分析，且具有较高的精度。
[关键词] 水平侧向力分布；Pushover算法；高阶振型
中图分类号：TU375.4  文献标识码：A  文章编号：1002-848X(2011) Sl-0234-04

Analysis on seismic performance of frame construction based on improved Pushover algorithm
    Li Yongjing, Lin Yuhan, Guo Qiufeng
    (Institute of Civil and Traffic Engineering, Liaoning Technical University, Fuxin 123000, China)

Abstract: On the basis of the response spectrum method of computing seismic response, the increment capacitance of distribution of horizontal side force was improved considering Pushover algorithm of higher mode. By means of the example of calculation, comparison and analysis were made for curves, drift angle and shear force with former uruform distribution and downward-pointing triangle distribution of side force. The results show that the deviation of uruform distribution is the biggest then the downward-pointing triangle distribution. The smallest one is improved deviation. The improved distribution of side force can make the analysis for seismic performance of frame construction better and have high accuracy at the same time.
Keywords: distribution of horizontal side force; Pushover algorithm; higher mode