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首页> 外文期刊>Bulletin of earthquake engineering >Generalized corrective eccentricities for nonlinear static analysis of buildings with framed or braced structure
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Generalized corrective eccentricities for nonlinear static analysis of buildings with framed or braced structure

机译：具有框架或支撑结构的建筑物非线性静态分析的广义矫正偏心

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摘要

The nonlinear static method of analysis has become the most popular tool for the seismic assessment of existing buildings. However, seismic codes do not allow its use for in-plan irregular buildings because it does not provide accurate predictions of the deck rotation. To overcome this limitation, the "corrective eccentricity method" evaluates the maximum seismic response as the envelope of the results of two nonlinear static analyses. In these analyses, the lateral force is applied with two different (corrective) eccentricities with respect to the centre of mass of the deck. The corrective eccentricities were calibrated on single-storey systems with unidirectional resisting elements, i.e. with elements that are representative of walls or braced frames. This paper proposes new corrective eccentricities aiming at generalizing and simplifying the previous corrective eccentricity method. In particular, new equations are defined for the corrective eccentricities devoted to predict the displacement demand on the stiff side of the building. These equations are defined based on the response of a set of single-storey systems representative of buildings with uni-directional or bi-directional resisting elements (e.g. moment resisting frames). Further, the displacement demand on the flexible side of the building is determined assuming a null eccentricity of the lateral force. The response of a set of multi-storey buildings is predicted by means of the new and original corrective eccentricities and compared to the maximum response obtained by nonlinear dynamic analysis. This comparison is made in terms of floor displacements, storey drifts and storey shears. The set of the examined structural systems comprises buildings with steel braced structure as well as buildings with r.c. framed structure.
机译：非线性静力分析方法已成为现有建筑抗震评估的最常用工具。然而，地震规范不允许将其用于平面内的不规则建筑，因为它不能提供准确的甲板旋转预测。为了克服这一限制，“修正偏心率法”将最大地震响应作为两个非线性静力分析结果的包络线进行评估。在这些分析中，横向力是以两种不同（纠正）的偏心距相对于桥面质量中心施加的。校正偏心在带有单向阻力元件的单层系统上进行了校准，即使用代表墙壁或支撑框架的元件。本文提出了新的偏心校正方法，旨在推广和简化以前的偏心校正方法。特别是，定义了用于预测建筑物刚性侧位移需求的修正偏心率的新方程。这些方程的定义基于一组单层系统的响应，这些系统代表具有单向或双向阻力构件（例如抗力矩框架）的建筑物。此外，假定侧向力的零偏心率，确定建筑物柔性侧的位移需求。通过新的和原始的修正偏心率预测一组多层建筑的响应，并与非线性动力分析获得的最大响应进行比较。这种比较是根据楼层位移、楼层漂移和楼层剪力进行的。这套经过检查的结构系统包括钢支撑结构的建筑物以及钢筋混凝土框架结构的建筑物。

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