多塔大底盘RC框架隔震建筑抗震韧性设计研究

Investigation on the Resilience-based Seismic Design of Isolated Reinforced Concrete Frame Structure with Multi-towers Built on Large Chassis

以位于Ⅷ度区(0.3 g)的某多塔钢筋混凝土(Reinforced Concrete,RC)框架建筑为研究对象,对其进行了大底盘隔震设计,研究了在设防、罕遇地震作用下3个塔楼的动力响应,并基于韧性评价标准对该隔震方案展开了2个地震水准下的抗震韧性评价。结果表明:隔震后结构基本周期延长至原来的3倍,降低了地震作用,有效控制了上部结构的地震响应。楼面绝对加速度的显著控制基本消除了加速度敏感型非结构构件的损伤。结构构件以及位移敏感型非结构构件的修复费用主导了建筑的修复费用。建筑的修复时间由阶段Ⅰ中结构构件的修复时间控制,此隔震方案下建筑的抗震韧性等级达到了三星。

A reinforced concrete(RC)frame structure with multi-towers located in theⅧ-degree(PGA=0.3 g)region was integrated into a common isolation system.The seismic response of the three towers in case of being hit by the design basis earthquake(DBE)and the maximum considered earthquake(MCE)was studied,and the assessment of the towers seismic resilience was carried out based on the Standard for Seismic Resilience Assessment of Buildings(GB/T 38591—2020).The results indicate that the isolation technology helps to extend the basic period of the structure by three times,reduce the seismic action,and effectively control the seismic response of the superstructure.Significant control of the absolute floor acceleration eliminates the damage of acceleration-sensitive non-structural components(ASNSCs).The repair cost of the structural components as well as the displacement-sensitive non-structural components(DSNSCs)takes up a major part of the total cost,and the repair time of the structural components in Phase 1 decides the total repair time of the structure.The seismic resilience of the structure applied with the seismic isolation scheme proposed in this paper can be successfully improved to Level 3,the outcomes can provide reference for design of isolated structure on large chassis.