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作 者:于志强[1] 周绪红[1,2] YU Zhiqiang;ZHOU Xuhong(College of Civil Engineering,Hunan University,Changsha 410082,China;School of Civil Engineering,Chongqing University,Chongqing 400045,China)
机构地区:[1]湖南大学土木工程学院,湖南长沙410082 [2]重庆大学土木工程学院,重庆400045
出 处:《建筑结构学报》2025年第3期102-116,共15页Journal of Building Structures
摘 要:为满足高烈度抗震设防区对结构延性的需求,提出了交错桁架钢框架-开缝钢板剪力墙(staggered truss steel frame-steel plates shear wall with slits,STSF-SPWS)结构体系,并基于FEMA P695和T/CECS 392—2021《建筑结构抗倒塌设计标准》对其横向抗地震倒塌性能进行评估。建立了平面协同分析模型进行Pushover分析,给出设防地震性能目标下的结构影响系数建议值;基于Pushover分析结果明确了各受力阶段的受力和变形特点,提出了抗地震倒塌位移判定指标;采用增量动力分析(incremental dynamic analysis,IDA)进行抗地震倒塌易损性分析,得到了倒塌储备系数(collapse margin ratio,CMR);采用基于CMR的结构抗地震倒塌性能评估方法,根据调整后的倒塌储备系数(adjusted CMR,ACMR)和倒塌概率评估了交错桁架钢框架-开缝钢板剪力墙结构的横向抗地震倒塌性能。分析结果表明:对于所分析的模型,其功能连续、修复后使用和生命安全性能指标对应的结构影响系数建议分别取为2.32、3.38和4.28;交错桁架钢框架-开缝钢板剪力墙结构的地震倒塌位移判定指标可取为1/25;按所建议的结构影响系数设计的交错桁架钢框架-开缝钢板剪力墙结构在罕遇地震和极罕遇地震作用下的安全储备满足FEMA P695要求。To meet the demand for the structural ductility in high seismic precautionary intensity zone,a staggered truss steel frame-steel plates shear wall with slits(STSF-SPWS)system was proposed.The transversal seismic collapse resistance of the structure was evaluated on the basis of FEMA P695 and T/CECS 392—2021‘Standard for anti-collapse design of building structures'.A plane collaborative analysis model was established to carry out pushover analysis,and the suggested value for the structural influence coefficient of the performance objectives under precautionary earthquake was provided.Based on the Pushover analysis results,the mechanic and deformation characteristics were clarified under each load phase and the seismic collapse decision indexes were obtained.Incremental dynamic analysis(IDA)was conducted to investigate seismic collapse vulnerability and the collapse margin ratio(CMR)was obtained.The evaluation method for the structural seismic collapse performance based on the CMR was adopted.According to the adjusted CMR(ACMR)and collapse probability,the transversal seismic collapse performance of STSF-SPWS was evaluated.The analysis results show that structural influence coefficients of the models investigated in this paper corresponding to the functional continuity,post-repair use,and life safety performance levels are respectively suggested as 2.32,3.38 and 4.28.The seismic collapse decision index of the STSF-SPWS could be valued as 1/25.The STSF-SPWS designed according to the proposed structural influence coefficient could satisfy the safety margin requirement of the FEMA P695 under rare and extremely rare earthquakes.
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