抗冲切钢筋对板柱中节点抗震性能的影响
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1.湖南大学土木工程学院;2.中铁二院工程集团有限责任公司

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复杂受力混凝土结构设计理论与方法研究;钢筋混凝土板柱结构抗震设计理论与方法研究


The effect of shear reinforcement on seismic performance of interior slab-column connections
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1.College of Civil Engineering, Hunan University;2.China Railway Eryuan Engineering Group CO. LTD

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    摘要:

    为研究抗冲切钢筋和暗梁宽度对板柱节点抗震性能的影响,进行了5个低周往复荷载作用下的板柱节点试验,其中1个试件无抗冲切钢筋,另外4个试件分别配置螺旋箍筋、四肢箍筋、八肢箍筋和栓钉。对各试件的裂缝发展特征、破坏形态、滞回性能、不平衡弯矩承载力和延性性能等进行了分析。试验结果表明:配置抗冲切钢筋试件的不平衡弯矩承载力和延性性能较无抗冲切钢筋试件的提高幅度分别为13%~48%和68%~198%;增加暗梁宽度能明显提高试件的整体抗震性能,配置四肢箍筋的试件能满足我国规范的抗震性能需求,且较采用八肢箍筋的试件更经济。总结和分析已有试验数据,发现我国规范对于配置抗冲切钢筋板柱节点的计算结果与试验结果整体较吻合,离散度偏高。

    Abstract:

    To study the effect of shear reinforcement and width of concealed beam on seismic behavior of slab-column connections, five slab-column connections were tested under low-cycle reversed load. The control specimen had no shear reinforcement, while the other four specimens were equipped with spiral stirrups, four-leg stirrups, eight-leg stirrups and studs, respectively. Crack development characteristics, failure modes, hysteretic behaviour, unbalanced moment capacity and ductility of each specimen were analyzed. The results show that compared with the specimen without shear reinforcement, unbalanced moment capacity and ductility of specimens with shear reinforcement are increased by 13%~48% and 68%~198%, respectively. The general seismic performance of specimens is significantly improved by increasing the width of concealed beam. The specimen with four-leg stirrups can meet the requirement of seismic performance in Chinese code and is more economical than one with eight-leg stirrups. By summarizing and analyzing existing test data, it is find that for slab-column connections with shear reinforcement, the calculated results with Chinese code are in good agreement with test results, but the dispersion of calculated results is relatively high.

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  • 收稿日期:2019-06-17
  • 最后修改日期:2019-12-17
  • 录用日期:2020-01-15
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