带预应力橡胶支座相邻隔震结构碰撞分析

摘要

普通橡胶支座（RB）隔震结构在强震作用下因水平位移过大而容易与相邻结构产生碰撞。应用非线性Hertz-damp碰撞单元，建立了带预应力隔震支座（PRB）的相邻结构碰撞模型，推导了其动力碰撞方程。在此基础上，研究预应力隔震支座对相邻隔震结构碰撞的影响，分析了其碰撞响应的影响因素。研究表明：与普通橡胶隔震支座相比，预应力橡胶隔震支座能有效减小隔震结构的水平位移，从而减小相邻结构的碰撞响应。%Base-isolated structures with general rubber bearings may impact adjacent buildings easily due to the excessive horizontal displacements under strong earthquake.Here,using nonlinear pounding element,a pounding model of adjacent isolated structures with prestressed rubber bearings (PRBs)was built,and the pounding dynamic equation was deduced.On this basis,the influence of prestressed rubber bearings (PRBs)on the pounding of adjacent isolated structures was studied,and the influencing factors of pounding is analysed.The results showed that compared to general RB,PRB can reduce effectively the horizontal displacements of isolated structures,and diminish the pounding responses of adjacent structures.