孙小云, 韩建平, 党育, 周颖. 地震动持时对考虑梁柱节点区不同破坏模式RC框架的地震易损性影响[J]. 工程力学, 2018, 35(5): 193-203. DOI: 10.6052/j.issn.1000-4750.2017.01.0089
引用本文: 孙小云, 韩建平, 党育, 周颖. 地震动持时对考虑梁柱节点区不同破坏模式RC框架的地震易损性影响[J]. 工程力学, 2018, 35(5): 193-203. DOI: 10.6052/j.issn.1000-4750.2017.01.0089
SUN Xiao-yun, HAN Jian-ping, DANG Yu, ZHOU Ying. EFFECT OF GROUND MOTION DURATION ON SEISMIC FRAGILITY OF RC FRAMES WITH DIFFERENT BEAM-COLUMN JOINT FAILURE MODES[J]. Engineering Mechanics, 2018, 35(5): 193-203. DOI: 10.6052/j.issn.1000-4750.2017.01.0089
Citation: SUN Xiao-yun, HAN Jian-ping, DANG Yu, ZHOU Ying. EFFECT OF GROUND MOTION DURATION ON SEISMIC FRAGILITY OF RC FRAMES WITH DIFFERENT BEAM-COLUMN JOINT FAILURE MODES[J]. Engineering Mechanics, 2018, 35(5): 193-203. DOI: 10.6052/j.issn.1000-4750.2017.01.0089

地震动持时对考虑梁柱节点区不同破坏模式RC框架的地震易损性影响

EFFECT OF GROUND MOTION DURATION ON SEISMIC FRAGILITY OF RC FRAMES WITH DIFFERENT BEAM-COLUMN JOINT FAILURE MODES

  • 摘要: 地震动持时对非弹性结构的累积损伤和破坏有较大影响,但目前抗震分析设计中对地震动持时的规定是不明确的。从美国太平洋地震工程研究中心地震动数据库中选择具有不同持时和加速度峰值的60条地震动记录(PEER)中选取具有不同持时和加速度峰值的60条地震动记录,并划分为长、短持时两组各30条。利用OpenSees分析软件建立了一钢筋混凝土框架-填充墙结构教学楼的三维空间模型。分别以梁柱节点区不考虑非弹性变形、梁柱节点区考虑钢筋黏结滑移、梁柱节点区考虑钢筋黏结滑移和剪切变形三种工况来依次模拟节点区的破坏模式。以此60条地震动记录为输入进行结构的地震易损性分析,得到在五种损伤水平下,对应于不同工况两组持时记录的结构地震易损性曲线,进而评估地震动持时对考虑节点区不同破坏模式结构抗震性能的影响。分析结果表明,相对于短持时地震动记录,长持时地震动记录使结构在相应损伤水平和工况下的超越概率明显提高;同一损伤水平下,按照梁柱节点区不考虑非弹性变形,考虑钢筋黏结滑移,同时考虑钢筋黏结滑移和剪切变形的顺序,长、短持时地震动记录作用下其超越概率均显著提高,且长持时地震动记录对节点区考虑钢筋黏结滑移和剪切变形结构的影响更为明显。

     

    Abstract: Ground motion duration has great influence on the cumulative fragility and damage of inelastic structures, but the consideration of duration is not clear in current seismic analysis and design. 60 ground motion records with different durations and peak ground accelerations were selected from the PEER strong ground motion database, and categorized as 30 long-and 30 short-duration records. A three-dimensional model of an infilled RC frame teaching building was built via OpenSees. In order to simulate the different failure modes of the beam-column joints, three models were taken, which are the beam-column joints without considering inelastic deformation, with considering the bar bond-slip, and with considering both the bar bond-slip and the shear deformation. Seismic fragility analysis was carried out on the three models under the 60 ground motion records, and the fragility curves for two the kinds of records under different cases were obtained corresponding to five damage levels. Furthermore, the influence of ground motion duration on structural seismic behavior considering the different failure modes of beam-column joints was evaluated. The analytical results show that comparing with the short-duration records, the long-duration records can increase the structural exceedance probability obviously for the corresponding damage levels and beam-column joint cases. Comparing with the case without considering inelastic deformation of beam-column joints, both long-and short-duration records can increase the structural exceedance probability clearly under the same damage level when considering the bar bond-slip or considering both the bar bond-slip and the shear deformation. The effect of long-duration ground motion records on structural seismic performance considering the bar bond-slip and the shear deformation of the beam-column joints is more obvious.

     

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