唐明 易伟建 吴越凡 刘力维

摘要：为研究抗冲切钢筋和暗梁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分别提高13%～48%和68%～198%;合理设计暗梁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中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，中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，但离散度偏高。

关键词：板柱节点;抗震性能;冲切破坏;栓钉;箍筋

中图分类号：TU375.2 文献标志码：A 文章编号：20966717（2020）03005410

Abstract：

To study the effect of shear reinforcement and installation of concealed beam on seismic behavior of slabcolumn connections， five slabcolumn connections were tested under lowcycle reversed load. The control specimen had no shear reinforcement， while the other four specimens were equipped with spiral stirrups， fourleg stirrups， eightleg 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 properly designing the concealed beam. The specimen with fourleg stirrups can meet the requirement of seismic performance in Chinese code and is more economical than the that with eightleg stirrups. By summarizing and analyzing existing test data， it is found that for slabcolumn 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.

Keywords：slabcolumn connection; seismic performance; punching failure; studs; stirrups

钢筋混凝土平板结构体系具有施工方便、降低结构层高和传力路径直接等优点。然而，对处于中震地区的平板结构，其在使用过程中可能产生较大的内力和变形，因此，抗冲切钢筋常被运用于板柱节点的设计，以提高其承载能力和变形能力等抗震性能。目前，开展试验研究采用的抗冲切钢筋类型主要有两类：箍筋[16]和栓钉[415]。学者们研究了抗冲切钢筋的直径、间距、数量、布置方式和类型等因素对板柱节点抗震性能的影响。Hawkins等[1]完成了5个板柱节点试验，结果表明，合理设计箍筋能有效提高节点的延性、耗能能力和残余承载力，避免节点发生脆性破坏。……