Seismic reliability functions for multistorey frame and wall‐frame systems
Seismic reliability functions for multistorey frame and wall‐frame systems
复制标题
多层框架和墙框架系统的抗震可靠性函数
DOI：
10.1002/eqe.613
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发表时间：
2006
影响因子：
4.5
通讯作者：
L. Esteva
中科院分区：
文献类型：
--
作者：
J. Alamilla;L. Esteva
多层框架系统的地震可靠度函数表示为Cornell's β指数的值，根据地震烈度的两种替代度量，根据屈服位移或通过推覆分析获得的系统全局行为的简化模型的变形能力进行归一化。安全边际定义为导致系统崩溃的强度与假定作用于系统的强度的自然对数之差。定义多层体系的变形能力的问题用这种方式规避了。提出的方法是通过其应用于几个钢筋混凝土刚框架，包括柱-梁和墙-框架系统说明。地面运动激励是在墨西哥谷软土遗址记录的具有代表性的。对钢筋混凝土构件粗截面和裂缝截面的可靠度函数进行了比较。结果表明，可靠性函数不仅依赖于归一化强度的期望值，而且依赖于归一化强度的频散，频散对系统基本周期与地震动主导周期的比值很敏感。对一般系统基于可靠性的抗震设计准则的建立提出了一些意见。版权所有©2006约翰威利父子有限公司
Seismic reliability functions of multistorey frame systems are expressed as values of Cornell's βindex in terms of two alternative measures of the earthquake intensity, normalized with respect to the yield displacement or to the deformation capacity of a simplified model of the global behaviour of the system obtained by pushover analysis. The safety margin is defined as the difference of the natural logarithms of the intensity that leads to collapse and that assumed to act on the system. The problem of defining a deformation capacity for a multistorey system is circumvented in this manner. The method proposed is illustrated through its application to several reinforced concrete rigid frames, including both column‐and‐beam and wall‐frame systems. Ground motion excitations are representative of those recorded at soft soil sites in the Valley of Mexico. A comparison is made of the reliability functions obtained on the basis of the gross section or the cracked section of reinforced concrete members. The results show that the reliability functions do not only depend on the expected values of the normalized intensity, but also on its dispersion, which is sensitive to the ratio of the fundamental period of the system to the dominant period of the ground motion. Some comments are presented about the establishment of reliability‐based seismic design criteria for generic systems. Copyright © 2006 John Wiley & Sons, Ltd.