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Nonlinear Seismic Response of Structural System with Gravity Bias

机译：重力偏压结构系统的非线性地震响应

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Gravity forces could lead to unsymmetrical lateral resistance capacity in a building structure. This phenomenon, called "gravity bias", could result in detrimental behavior in structure's seismic response. In order to investigate this issue, a series of nonlinear time history analyses were conducted for representative single degree of freedom structures with variation of several parameters. The analyses results showed that both maximum relative displacement and ductility demand of a structure increases due to gravity bias. The influences of structural period of vibration, hysteretic characteristics, and site class on the gravity bias effect were also investigated. Based on this study, it is suggested that a smaller response reduction factor should be chosen for design when gravity bias exists.
机译：重力力可能导致建筑结构中的不对称横向电阻容量。这种称为“重力偏见”的现象可能导致结构的地震反应中的不利行为。为了调查这个问题，针对具有几个参数的变异的代表性单一自由度结构进行了一系列非线性时间历史分析。分析结果表明，由于重力偏压，结构的最大相对位移和延展性需求增加。还研究了结构时期的影响，滞后特征和站点类对重力偏置效应的影响。基于这项研究，建议当存在重力偏差时，应选择较小的反应减少因子。

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