摘要
基于损伤控制理念,设计了一种可更换连接件的H型钢柱滑移摩擦柱脚节点。该柱脚节点将能量耗散机制与震后修复机制相结合,从而提高其抗震韧性。对2组共6个柱脚节点进行初始、第一次修复和第二次修复后的低周往复加载试验。对比了初始试件和修复后试件的破坏形态、滞回曲线、耗能能力和刚度退化等抗震性能指标。结果表明:柱脚节点具有良好的耗能能力,主要通过摩擦耗能实现;柱脚节点的损伤仅集中在连接件的转角处,钢柱底部的可摇摆构造有效避免了柱脚区域钢柱的损伤;柱脚节点第一次修复,即重新拧紧螺栓,整体抗震性能可基本恢复,但在再次加载中会加重连接件损伤;柱脚节点第二次修复,即通过更换摩擦板、高强螺栓和连接件,整体抗震性能可恢复至初始水平。
Based on the damage control concept,a sliding friction column base for H-beam columns with replaceable connectors was designed.This column base combines the energy dissipation mechanism with the post-earthquake repair mechanism to improve seismic toughness.Initial,first repaired,and second repaired low circumferential reciprocating loading tests on 2 groups of 6 specimens.The seismic performance of the column base was investigated by comparing the damage pattern,hysteresis curve,energy dissipation capacity,and stiffness degradation of the initial and post-repair tests.The results show that the column base has good energy dissipation capacity,mainly through frictional energy dissipation.The damage of the column base is only concentrated in the corner of the joint,and the swinging construction at the bottom of the steel column effectively avoids the damage of the steel column in the column base area.In the first repair of the column base,re-tightening the bolts,the overall seismic performance can be restored by re-tightening the bolts,but it will aggravate the damage of the connectors.The second repair by replacing the friction plate,high-strength bolts,and connectors,overall seismic performance can be restored to the initial level.
作者
李成玉
王义龙
陈焰周
吴东平
LI Chengyu;WANG Yilong;CHEN Yanzhou;WU Dongping(School of urban construction,Wuhan University of Science and Technology,Wuhan 430065,China;Institute of High Performance Engineering Structure,Wuhan University of Science and Technology,Wuhan 430065,China;Central-South Architectural Design Institute Co.,Ltd,Wuhan 430071,China)
出处
《建筑结构学报》
EI
CAS
CSCD
北大核心
2023年第S02期331-340,437,共11页
Journal of Building Structures
基金
国家自然科学基金项目(51878522)。
关键词
柱脚节点
损伤控制
滑移摩擦
拟静力试验
恢复性能
抗震性能
column base
damage control
sliding friction
quasi-static test
recoverable performance
seismic performance
