【摘要】 应用MR阻尼器对钢框架-混凝土核心筒混合结构的非线性地震损伤实施控制。分别建立钢框架和混凝土核心筒的损伤准则,通过LS-DYNA有限元程序的二次开发功能,将MR阻尼器的Bouc-Wen出力模型、半主动控制律和钢材的弹塑性损伤本构模型引入到主程序中,并对结构各层阻尼器的出力能力进行优化设计。以强震下一15层钢-混凝土混合结构为例,数值分析未安装阻尼器、在核心筒与钢框架之间安装阻尼器和在钢框架柱之间安装阻尼器等三种情况下结构的动力响应和损伤发展过程,结果表明两种阻尼器安装方案均能有效控制结构层间位移和结构各层剪力响应,并且受控结构核心筒的损伤指数明显减小。更多还原

【Abstract】 A nonlinear seismic damage control strategy for steel frame-concrete core tube hybrid structure is presented.The damage criteria for steel frame and concrete tube are proposed,respectively.Furthermore,based on the secondary development of LS-DYNA program the Bouc-Wen model of MR damper,semi-active control law and elasto-plastic damage material model of steel are incorporated into the main program,by which the maximal control force of MR dampers for each story is optimally designed.Taking a 15-story steel-concrete hybrid structure under large earthquake as an example,the dynamic responses and damage process of the structures are analyzed without and with MR dampers located between steel frame and concrete tube,and with MR dampers between the columns of steel frame,respectively.Numerical results indicate that MR dampers can control the story drift and story shear force effectively,and the damage of the core tube may be significantly reduced.更多还原