梁铰型屈服RC框架结构地震弹塑性位移增大系数研究

Seismic inelastic displacement amplification factor for beam-hinge mechanism RC frame

本文通过弹性和弹塑性时程分析,研究了水平地震作用下梁铰型屈服RC框架模型结构的楼层屈服剪力系数、基本自振周期、楼层数3个因素对弹塑性位移增大系数的影响,通过非线性回归分析给出了弹塑性层间位移增大系数经验公式;通过分析滞回耗能沿楼层高度的分布,初步确定了梁铰型屈服RC框架结构的薄弱楼层位置;基于结构损伤分析,讨论了抗震规范中RC框架结构弹塑性层间位移角限值的水准。

This paper studies, by elastic and inelastic time-history analysis, the influence of story yielding shear force factors, fundamental periods of structures and number of story on inelastic inter-story displacement amplification factors computed for beam-hinge mechanism RC frame model when subjected to horizontal earthquake ground motions. The simplified functional expressions of the inelastic inter-story displacement amplification factors are proposed by a statistical regression analysis. The expressions can be used to estimate the inelastic inter-story displacements based on the elastic inter-story displacements within larger scope of parameters. The weak story is suggested by analyzing the distribution of hysteretic energy in height of story. Furthermore, the maximum inter-story angle limit for RC frame in China seismic code is discussed by damage based analysis.