基于刚度需求设计的轻型消能摇摆架减震性态分析

Performance analysis of light energy dissipative rocking frame designed on the basis of stiffness demand

根据不同层数框架结构的的刚度需求,以控制结构一阶模态下的层间位移集中系数为性能目标,设计轻型消能摇摆架并基于性能的损伤指标对结构进行性态分析。对带有摇摆架4层、8层和12层的RC框架分别在近场有脉冲、近场无脉冲和远场地震动作用下结构进行动力时程分析,确定结构刚度需求与层数的关系,然后据此针对6层RC框架设计轻型摇摆架(LRF)和自复位耗能支撑(SCED),基于OpenSees在近场有脉冲和无脉冲地震动多遇、设防和罕遇水平下进行非线性动力时程分析。与原结构相比,加入自复位消能摇摆架后,结构的损伤状态得到明显的改善,损伤分布更加均匀,有效地降低了结构的位移响应和残余位移。

According to stiffness demand of RC frames of variable stories, the Drift Concentration Factor （DCF） under 1st mode is taken as performance control point, to design a Light Energy Dissipative Rocking Frame （EDLRF）and analyze its performance state with performance-based damage index. The seismic responses of 4-story, 8-story, and 12-storey RC frame structures are analyzed under near-field ground motions with velocity pulses, without velocity pulses and far-field ones. The relationship between structure stiffness demand and stories is given through curve fitting. Nonlinear dynamic time-history analysis under near-field ground motion sets with velocity pulses and without velocity pulses corresponding to three hazard levels were performed by OpenSees. Compared to original structure under the cases considered, the damage state of structure is improved, damage distribution is more even, and the displacement and residual drift is controlled more effectively.