(1.西安建筑科技大学土木工程学院，710055；2.中冶京诚工程技术有限公司，北京，100053)
［提要］  非线性静力分析方法可以较为简便地预估结构的弹塑性反应，但仅取常见水平侧向力分布模型并不能满足实际工程的需要，例如高振型的影响和不规则结构的特殊性。对竖向不规则结构进行非线性时程分析，建立了水平侧向力分布与结构层刚度的关系式，从而提出了一种新的水平侧向力分布形式和方法。结合几种常见的水平侧向力形式，对5种侧向刚度不规则的情况进行了推覆分析，并与时程分析结果进行了比较，结果表明该方法不但可以找到各种侧向刚度不规则结构的薄弱层而且还具有较高的精度。
［关键词］  侧向力分布  竖向不规则结构  侧向刚度不规则  非线性静力分析  基于性能  抗震设计
Research on Lateral Load Distribution in Nonlinear Static Procures of Vertically Irregular Buildings/Shi Qingxuan1, Men Jinjie1, Li Jiafu2(1 College of Civil Engineering，Xian University of Architecture and Technology，Xian 710055,China; 2 Capital Engineering & Research Incorporation Ltd.,Beijing 100053,China)
Abstract:Nonlinear static procures (NSP) are widely used in performance based seismic design since it provides practitioners a relatively simple approach to estimate inelastic structural response measures. However, conventional lateral load patterns used in NSP can not satisfy the practical engineering demand, such as the effect of higher modes and the particularity of irregular building. Through nonlinear time history (NTH) analysis of vertically irregular buildings, an equation of lateral load and story stiffness is established, and so a new lateral load distribution is obtained. The validity of the procedure is validated by comparing response quantities such as interstory drift ratio using other pushover methods and also the results of NTH analysis. It is shown that the new procedure can not only detect the soft story but also have a high accuracy.
Keywords:lateral load distribution; vertically irregular buildings; irregular stiffness; nonlinear static procures; performance based seismic design
*陕西省教育厅专项资金资助项目(JK0135)。