钢筋砼框架结构易损性评估的参数敏感性分析

Parameter sensitivity analysis of seismic vulnerability assessment for RC frames

运用基于位移的地震易损性概率评估方法,以梁铰破坏机制的钢筋砼框架为例,就地面峰值加速度、框架梁的几何参数和结构的材料参数在易损性评估中的敏感性展开研究.研究表明,地面峰值加速度、框架梁几何参数和钢筋极限应变的均值变化会对钢筋砼框架结构的地震易损性评估结果产生较大的影响,它们的变异系数取值也会对易损性评估结果产生一定的影响,但影响程度要小于均值的变化;砼极限应变的概率分布特征则对地震易损性的评估结果影响甚微.

Adopting the displacement-based probabilistic seismic vulnerability assessment methodology, the sensitivities of the parameters of the beam-sway RC frames are studied. These parameters include the peak ground acceleration, the structural beam geometric parameters and the material parameters. The analyses show that the vulnerability assessment results will change obviously when the mean values of peak ground acceleration, the beam geometric parameter and the limit state strain of reinforcement bar are changed. The coefficients of variability of the above parameters also affect the vulnerability assessment results while not so obvious compared with their mean values. The limit state strain value of concrete will affect little on the vulnerability assessment results.