铅芯橡胶支座参数变化对大跨空间网架水平隔震效果的影响

Influence of Parameters of Lead Laminated Rubber Bearing on the Horizontal Seismic Isolation for Long-span Space Truss Structures

提出在上部空间网架结构和下部支撑结构之间应用铅芯橡胶支座设置水平隔震层,可以有效地减小空间网架结构的水平地震响应。采用非线性时程分析方法计算了某大跨空间网架结构采用铅芯橡胶支座水平隔震前后的地震响应,研究了铅芯橡胶支座对网架结构水平隔震效果的主要影响参数,并详细分析了铅芯橡胶支座屈服力、屈服前刚度和屈服前后刚度比等三种设计参数的变化对水平隔震效果的影响规律,在此基础上给出了网架结构的水平隔震设计建议。

In order to improve the horizontal seismic performance of long-span space truss structures, the horizontal seismic isolation method is put forward with regard to the good mechanical properties of the lead laminated rubber bearing, which incorporates the bearing into the structure between the upper space truss structure and the lower supporting structure. The seismic responses of a practical long-span space truss structure are calculated before and after adopting seismic isolation technology using nonlinear time-history analysis method. The influences of parameters of lead laminated rubber bearings on the horizontal seismic isolation of the structure are discussed in detail, on the basis of which the action rules of the horizontal seismic isolation effects of the space truss structure are presented with regard to the changes of parameters of lead laminated rubber bearings such as yield force, pre-yield stiffness and ratio of pre-yield stiffness to post-yield stiffness. Some design suggestions for horizontal seismic isolation of space truss structures are further presented.