（内蒙古科技大学土木工程学院， 包头 014010）

［摘要］为研究部分包裹混凝土柱-型钢梁顶底角钢连接三维框架的抗震性能，对框架试件进行低周反复水平荷载试验，研究此类框架的破坏模式和承载力、滞回性能、延性等一系列抗震性能指标。研究结果表明:框架梁端屈曲明显，靠近角钢肢处出现塑性铰，顶底角钢变形严重;滞回曲线比较饱满，在各级循环荷载作用下承载力降低系数在0-95～0-99之间，框架强度退化稳定。节点位移延性系数在2-01～2-85之间，等效黏滞阻尼系数在0-35～0-46之间，满足抗震设计要求，框架具有良好的延性和耗能能力。顶底角钢连接节点的初始转动刚度在半刚性节点范围内，是延性较好的节点。

［关键词］部分包裹混凝土； 角钢连接； 框架； 拟静力试验； 抗震性能

中图分类号：TU398文献标识码：A文章编号：1002-848X(2018)06-0076-06

Research on seismic behavior of  frame of partially encased concrete (PEC) column and steel beam connected with top-bottom angle

Zhao Gentian, Zuo Yanhui

(School of Civil Engineering, Inner Mongolia University of Science & Technology, Baotou 014010, China)

Abstract:In order to study the seismic behavior of three-dimensional frame of PEC column and steel beam jointed by top-bottom angle, the frame specimen was  tested under low cycle reversed quasi-static loading. The seismic behavior indicators were analyzed, such as the failure mode, bearing capacity, hysteretic behavior and displacement ductility coefficient. The results show that: the steel beam end buckles significantly, the plastic hinge appears near the limb of the angle and the top-bottom angle steel seriously deforms. Hysteresis curve of the frame is relatively full, and the bearing capacity reduction factor level is between 0-95 and 0-99. Strength degradation of frame is stable under cyclic load. The displacement ductility coefficient of joints is ranged from 2-01 to 2-85, and the equivalent viscous damping coefficients is between 0-35 and 0-46, which meets the seismic design requirements. The three-dimension frame had good ductility and energy dissipation capacity. The initial rotational stiffness of top-bottom angle joint is in the range of semi-rigid joint, which has good ductility.

Keywords:partially encased concrete; angle steel connection; frame; quasi-static test; seismic behavior

*国家自然科学基金项目(51268042)。

作者简介：赵根田，博士，教授，Email:zhaogentian93110@sina.com。