罕遇地震作用下型钢混凝土框架-钢筋混凝土核心筒结构耗能及损伤模式研究

STUDY OF MODE OF ENERGY DISSIPATION AND DAMAGE OF SRC FRAME-RC CORE WALL STRUCTURES UNDER STRONG EARTHQUAKE ACTIONS

采用有限元软件建立不同结构特性的型钢混凝土(SRC)框架-钢筋混凝土(RC)核心筒结构,考虑结构设计参数为墙整体系数、轴向变形系数及刚度特征值。为考察设计参数对框架-核心筒结构耗能及损伤模式的影响,进行罕遇双向地震作用下的弹塑性时程分析和非线性Pushover分析。研究表明:对于轴向变形系数越小、墙整体系数越大且刚度特征值越小的结构,在罕遇地震作用下其剪力墙可能发生不可控的耗能分布;通过分析结构中各类构件的屈服顺序及屈服发展形势,提出框架-核心筒结构的合理损伤模式,并给出设计建议。

Based on finite element software steel reinforced concrete（ SRC） frame-reinforced concrete（ RC） core tube structures with different structure characters were established. Main factors chosen as structure design parameters were wall integral coefficient,axial deformation coefficient and stiffness characteristic value. Elastio-plastic time history and nonlinear Pushover analyses of the structures were performed under bidirectional strong earthquake actions to examine the effects of designed parameters on the modes of energy dissipation and damage of SRC frame-RC core tube structures. Research results indicated that for the structure having smaller axial deformation coefficient,larger wall integral coefficient and smaller stiffness characteristic value,the energy distribution of the shear walls under rare earthquake might be not controllable. Furthermore,yield sequence of structure components and their development were studied. Moreover,reasonable damage mode of frame-core tube structures was proposed,and some design suggestions were given.