几何缺陷对双向偏压作用下矩形钢管混凝土柱受力性能影响分析  

Analysis of the influence of geometric imperfection on mechanic behavior of concrete-filled rectangular hollow section columns under bi-eccentric loading

作　　者：温晓飞 王蕊[1] 周侃[2] 

机构地区：[1]太原理工大学建筑与土木工程系,太原030024 [2]清华大学土木工程系,北京100084

出　　处：《建筑结构》2017年第S1期857-861,共5页Building Structure

基　　金：国家自然科学基金项目(51378290)

摘　　要：矩形钢管混凝土柱与钢筋混凝土梁具有便捷的连接方式和节点构造,被广泛用作现代建筑中的结构柱,其常常处于双向压弯状态。考虑组合柱中的相互作用和截面扭转变形的影响,建立了精细化的矩形钢管混凝土柱双向偏心受压作用下力学性能分析的有限元模型,计算结果与已有双向偏压矩形钢管混凝土柱试验结果吻合较好。文章重点分析了初始几何缺陷对构件受力性能的影响。分析结果表明,初始几何缺陷会减小构件沿强轴变形的刚度,增强沿弱轴变形的刚度;几何缺陷控制在构件长度的1/1000以内时,其对极限承载力的影响可忽略。Concrete-filled rectangular hollow section(RHS) columns are widely used as structural columns to take the eccentric vertical loading,as it is convenient to be connected with reinforced concrete beams in the way of connection and the construction of joint.It is usually often in a state of bi-axial bending.The influences of the interaction of members and rigid rotation were considered,and then elaborate finite element model to analysis the mechanic behavior of concrete-filled RHS columns under bi-eccentric loading was established.The results show the calculation results by finite element model agree well with experimental results.The influence of the initial geometric imperfection on the mechanic behavior was focused on and studied.The analysis results show that initial geometric imperfection can reduce the stiffness around the strong axis and increase the stiffness around the weak axis.When the geometric imperfection of component is controlled within 1/1000 of the column length,the influnce of geometric imperfection on ultimate bearing capacity can be ignored.

关 键 词：双向压弯 矩形钢管混凝土 有限元模型 扭转 几何缺陷 

分 类 号：TU398.9[建筑科学—结构工程]