钢筋混凝土结构在主余震作用下的概率累积损伤分析

本文利用我们在文献［１］中建立的主震与余震地面运动随机过程模型，以及在文献［２］中给出的带有负刚度段的三线性模型解析表达式，提出了钢筋砼结构在主震作用后，余震１作用下以及余震１作用后、余震２作用下的恢复力模型及其解析表达式；通过弹塑性随机地震反应分析，提出了结构在主震、余震１和余震２作用下的累积损伤模型及期望波损度与可靠性分析方法，最后给出了一两层钢筋砼框的算例。

PROBABILISTIC CUMULATED DAMAGE ANALYSIS OF R.C.STRUCTURES UNDER EARTHQUAKE HAVING AFTERSHOCKS

In this paper.the authors present a new model of restoring force and its analytical expression for R.C. structures after the mainshock of the eqrthquake or after the mainshock and aftershock,basing upon themodel of the ground motion of mainshock and aftershock of the earthquake by the modified random processin paper1]and also upon the analytical expression of trilinear model with negative stiffness given in ourprevious paper2].Then,method of expected damage index and dynamic reliability is put forward for thesame structure under mainshock,aftershock 1 and aftershock 2.Finally,a numerical example is given for il-lustration.