基于DAP方法的车辆基地上盖全框支剪力墙结构抗震性能评估

Seismic Performance Assessment of Complete Frame-supported Shear Wall Structure on Vehicle Depot Upper-cover Based on DAP Method

为综合评估在地铁车辆基地上盖开发中应用日益广泛的一种超限结构-全框支剪力墙结构的抗震性能,本文首先建立了结构的能力谱与非线性需求谱,进而采用基于位移的自适应静力推覆(DAP)方法研究其破坏机制,评估其抗震性能,最后进行弹塑性时程分析,以佐证抗震性能评估结果。研究结果表明,全框支剪力墙结构的延性系数为3.34,水平地震作用下结构塑性铰分布合理,无抗震薄弱部位,结构满足三水准设防要求及设计性能目标,且在不同水准地震下超强系数均不小于1.18,结构具有良好的抗震性能、抗倒塌能力及安全裕量。结构在罕遇地震作用下构件的屈服机制与DAP分析结果吻合,最大层间位移角均未超限,可满足预定性能目标要求。

In order to comprehensively evaluate the seismic performance of complete frame-supported shear wall structure,which is ultra-limit and increasingly widely used in the vehicle depot upper-cover,the structural capacity spectrum and nonlinear demand spectrum were firstly established,and then the displacement-based adaptive pushover(DAP)analysis was used to study the structural failure mechanism.Furthermore,the seismic performance was evaluated based on the DAP analysis results.Finally,elasto-plastic time history analysis was carried out to verify the seismic performance evaluation results.Results reveal that the structural ductility coefficient is 3.338,and the plastic hinge distribution under horizontal displacement load is reasonable.There is no seismic weak part and the designed structure can meet three-level fortification requirements and design performance target.The seismic structural overstrength factor is not less than 1.18 under different seismic levels,demonstrating good seismic performance,collapse resistance and redundancy.The yield mechanism of the structure under rare earthquakes is consistent with the results of the DAP analysis,and the maximum inter-story displacement angle does not exceed the limit.In summary,this structure can meet the requirements of predetermined performance targets.