圆钢管混凝土柱-钢梁削弱式节点抗震性能研究  

Study on seismic performance of concrete-filled circular steel tubular column-steel beam weakened joints

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作  者:孙昊 李吉人 SUN Hao;LI Jiren(School of Civil Engineering,University of Science and Technology Liaoning,Anshan 114000,China)

机构地区:[1]辽宁科技大学土木工程学院,辽宁鞍山114051

出  处:《辽宁科技大学学报》2023年第3期222-231,共10页Journal of University of Science and Technology Liaoning

基  金:国家级大学生创新创业训练计划(202110146029);教育部产学合作协同育人项目(202002129034);辽宁省普通高等教育本科教学改革研究项目(辽教办[2021]254号-No.230);辽宁科技大学实验教学改革项目(SYJG202351)。

摘  要:为探究圆钢管混凝土柱-钢梁结构体系中梁柱削弱式节点的抗震性能,建立翼缘犬骨削弱和腹板圆孔削弱两种形式的节点在水平往复荷载作用下的有限元计算模型,对两种节点的破坏模式、能量耗散性能和节点延性进行对比研究。计算结果表明,不同削弱形式的节点翼缘板均发生弯扭破坏,腹板区域发生屈曲破坏。两种削弱形式极限承载力和刚度退化规律相似,建议对梁翼缘犬骨削弱范围不大于0.25bf,梁腹板圆孔削弱范围不大于0.35hb。相对于翼缘削弱节点,腹板削弱节点在水平往复荷载作用下易发生面外失稳,但其具有更好的耗能能力。实际工程中,对面外稳定性有更高要求时可采用翼缘削弱式节点,对于梁端约束且削弱区段可替换情况下可采用腹板削弱式节点,以满足不同的梁柱节点对抗震性能的要求。In order to study the seismic performance of beam-column weakened joints for concrete-filled circular steel tubular column-steel beam structure,the finite element calculation models of flange reduced section and web reduced section joints under the action of lateral reciprocating load were established.The failure modes,energy dissipation performance,and ductility of the two different joints were compared.It is shown that flange plates of different weakened joints exhibit flexural-torsional failure,and the web regions exhibit buckling failure.The ultimate bearing capacity and stiffness degradation of the two different joints are similar.It is suggested that the size of the flange reduced section is less than 0.25 b_(f) and the size of the web reduced section is less than 0.35 h_(b).Compared with flange reduced section joint,out-plane buckling failure occurs easily in the web reduced section joint and the energy dissipation capacity is better.In the actual project,flange reduced section joint will be selected for the requirement of out-plane stability.Web reduced section joint will be selected for the constrained beam end and replaceable weakened parts.The requirements of seismic performance for the different beam-column joints will be satisfied.

关 键 词:钢管混凝土柱 翼缘犬骨削弱 腹板圆孔削弱 梁柱节点 抗震性能 

分 类 号:TU318.9[建筑科学—结构工程]

 

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