摘要
屈曲约束支撑在建筑抗震中表现出优秀的耗能能力,在世界上得到广泛的开发和应用。国内大部分建筑为混凝土框架结构,屈曲约束支撑应用于混凝土框架结构时,由于连接节点较为复杂,需要对节点形式的可靠性进行研究和认证。考虑到H型钢自身刚度大、端部面积大等特性,设计出一种新型H型钢锚固连接节点,同时列举出另外两种衍生和改进的形式,分别为H型钢竖放、H型钢横放、H型钢横放锚板加长。利用ABAQUS有限元分析软件对其受力性能进行分析,在加载点进行单调位移加载,分别得到3种节点形式在受力情况下的位移-荷载曲线,证明3种新型节点的可靠性,以及彼此的性能差异。通过比较,发现3种节点形式的承载能力和受力性能依次提高,原因是H型钢在腹板方向刚度大,横放会增大加载面刚度;另外,加长锚板可以有效避免受压区混凝土过早出现应力集中。最后通过比较节点延性,总结出最实用的节点形式。
Buckling-restrained brace exhibits excellent energy dissipation capacity in earthquakes,therefore,it has been widely developed and applied all over the world.Most of the domestic buildings are concrete frame structure,the connection nodes are complex and the reliability of the node form need to be investigated and identified while buckling-restrained brace is applied in concrete frame.Considering the characteristics of H-section steel,such as high stiffness and large end,this paper provided a new type of connection nodes of H-beam anchor,and two other derivative and improved forms were proposed.The three different forms were upright H-beam,horizontal H-beam and lengthening the horizontal anchor plate of H-beam.The mechanical performance was analyzed by using ABAQUS,and the loading-displacement curve of three node types under stress was obtained by monotonous displacement loading in loading points.The reliability and performance differences of the three kinds of new nodes were verified.It was found that the carrying capacity and mechanical property of three kinds of node forms increased in turn through comparison.The reason is that the stiffness of H-beam is high in web direction and web placed horizontally will increase the stiffness of section.In addition,extension of anchor plate can effectively avoid stress concentration in compression zone early.Finally,through the comparison of the ductility of nodes,the most practical node form was summarized.
出处
《钢结构》
北大核心
2015年第8期6-11,共6页
Steel Construction
基金
国家自然科学基金资助(51178276)
