戎贤　王胜男　张健新

摘要：

通过对核心区应用X形配筋增强的高强钢筋异形柱边节点和同等条件下未被增强的高强钢筋异形柱边节点进行拟静力试验研究，对比分析异形柱边节点的破坏特征、滞回曲线、承载能力、位移及延性、刚度退化、耗能能力等抗震性能指标。研究结果表明，配置HRB500高强钢筋异形柱边节点比配置600 MPa级的边节点承载能低，但滞回性能好，变形能力强，刚度退化推迟，耗能能力强；在核心区加入X形配筋，均可以改善高强钢筋异形柱边节点的破坏特征，使边节点抗剪能力、变形能力、耗能能力增强，刚度退化推迟，提高异形柱边节点抗震性能，配置HRB500高强钢筋的试件核心区应用X形配筋加强后抗震性能提高效果更好。

关键词：

高强钢筋；边节点；异形柱；X形配筋；抗震性能

中图分类号：TU375.4

文献标志码：A文章编号：16744764（2017）02010006

Abstract：

The exterior joints of specially shaped columns with highstrength reinforcement， and with or without Xshaped reinforcement were tested under low cyclic loading. The damage characteristic， hysteretic curve， bearing capacity， displacement， ductility， stiffness degradation and energy dissipation capacity were compared. The results showed that for the exterior joints of specially shaped columns， the bearing capacity of the HRB500 joint was lower， but the hysteretic behavior， deformability， energy dissipation capacity were increased， the stiffness degradation was postponed. When Xshaped highstrength reinforcement added to the joints， the failure characteristics of the joint was improved， the stiffness degradation was postponed， the deformability， shear capability and energy dissipation capacity were increased， the seismic behavior of specially shaped column joints was improved significantly，and the seismic behavior of the HRB500 joint was improved more.

Keywords：

highstrength reinforcement； exterior joint； specially shaped column； Xshaped reinforcement； seismic behavior

相對于普通截面柱结构，异形柱结构体系由于具有节省室内空间、平面布置灵活等特点，可以较好地满足中国居民的居住要求[12]，学者们做了许多关于异形柱结构体系的各类试验研究及分析[310] ，中国学者也对异形柱结构进行了大量的研究，戎贤等[11]指出，增大配箍率可以提高异形柱试件的延性，改善其滞回特性。雷敏等[12]提出了T形钢管混凝土单向偏压柱承载力的计算方法。同时有学者针对异形柱节点薄弱问题，进行了节点增强的探讨。戎贤等[1314]指出，在节点核心区混凝土中加入钢纤维，可以改善异形柱节点滞回性能。曾磊等[15]提出，提高钢骨混凝土异形柱钢梁节点核心区的配箍率，可以提高试件的延性，改善耗能能力。……