(1 西安建筑科技大学土木工程学院，西安 710055； 2 武警工程学院建筑工程系，西安 710086)

［摘要］通过控制轴压比和梁高比，对6个钢结构箱形柱与梁异形节点模型进行拟静力试验，研究了钢结构异形节点的滞回曲线及其破坏特征，分析了钢结构异形节点的延性、极限承载力、强度与刚度退化、耗能能力等力学性能。结果表明：钢结构箱形柱与梁异形节点的抗震性能较好；位移延性系数在2.02~2.66之间，能够满足弹塑性极限变形的要求；节点域的耗能能力很强，小核心区耗能是节点耗能的主要方面；所有试件在层间位移角超过极限位移角时，强度与刚度无显著退化。

［关键词］钢结构；异形节点；小核心区；强度与刚度退化；延性；耗能

中图分类号：TU311.1，TU317.1文献标识码：A文章编号：1002-848X(2011)06-0042-06

Analysis on mechanical performances of steel box column-beam irregular joint

Xue Jianyang¹, Hu Zongbo², Liu Zuqiang¹, Peng Xiuning¹(1 College of Civil Engineering, Xi’an University of Architecture and Technology, Xi’an 710055, China；2 Department of Building Engineering, Engineering College of Armed Police Force, Xi’an 710086, China)

Abstract:Through quasi-static test of six different steel box column-beam irregular joint models, the behaviors of   the hysteretic curve, failure mechanism were analyzed  by taking the  axial load level and  beam height ratio into account. Some mechanical performances of steel irregular joint such as ductility, ultimate bearing capacity, degradation of strength and stiffness, energy dissipation were studied. The results indicate that the steel box column-beam irregular joint has good seismic performance and energy dissipation capacity. The ductility coefficient is between 2.02 and 2.66, which satisfies the requirements of plastic ultimate deformation. Steel irregular joint has stronger energy dissipation capacity. Energy dissipation in the small core area of panel zone plays key roles in energy dissipation of the specimen. Strength and stiffness degradation of all specimens are not notable when the interstory displacement exceeds ultimate displacement.

Keywords:steel structure; irregular joint; small core area;  strength and stiffness degradation; ductility; energy dissipation

*国家自然科学基金（50978217），中国博士后科学基金（20080440814）。

作者简介：薛建阳，博士，教授，Email：jianyang_xue@163.com。

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