摘要
通过拟静力试验研究箱型截面柱、厚底板和混凝土基础组成的外露式柱脚在极大变形下的抗弯性能及传力机制。通过试验研究锚栓的材质、数量和排列方式以及轴压比等参数对外露式柱脚的抗弯承载力、抗弯刚度、延性及耗能的影响。结果表明,增加2个锚栓可以提高20%左右的抗弯承载力,并提高耗能能力,但对初始刚度的提高并不明显。冷拔锚栓严重降低了柱脚的延性和耗能能力,不宜采用。柱脚承受竖向拉力时,柱脚节点将主要通过剪切变形来抵抗水平荷载,柱脚的抗弯承载力低、刚度小、耗能和延性较差。
A hollow steel column with rigid base plate connected to concrete foundation was loaded with stable vertical loading and cyclic horizontal loading to study the flexural behavior of exposed column base under large deformation. The flexural capacity,the rotational stiffness,the ductility and energy dissipation influenced by the material,the number and the arrangement of anchor bolts were investigated. The results showed that the additional two anchor bolts could increase the flexural capacity by 20%,however,not affected the initial rotational stiffness significantly. The cold-drawn anchor rods reduced the column base’s ductility and energy dissipation significantly,which should not be adopted. When column base was loaded with tension force,the joints mainly resisted horizontal loads with shear deformation,which had a terrible flexural capacity,initial rotational stiffness,energy dissipation,and ductility.
作者
刘浩
崔瑶
殷福新
Liu Hao Cui Yao Yin Fuxin(State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian 116024, China)
出处
《钢结构》
北大核心
2017年第1期40-44,共5页
Steel Construction
基金
国家自然科学基金项目(51208076)
中央高校基本科研业务费专项课题(DUT14LK04)
关键词
外露式钢柱脚
锚栓
轴压比
抗弯承载力
滞回性能
exposed column base
anchor bolts
axial force ratio
flexural capacity
hysteretic behavior
