预制装配式混合框架屈曲约束狗骨式节点抗震性能试验研究  

Experimental study on seismic performance of prefabricated hybrid joints with buckling-restrained dog-bone steel beam

作　　者：冯世强 杨勇[1,2] 薛亦聪 于云龙 王先铁[1] FENG Shiqiang;YANG Yong;XUE Yicong;YU Yunlong;WANG Xiantie(School of Civil Engineering,Xi’an University of Architecture and Technology,Xi’an 710055,China;Key Lab of Structural Engineering and Earthquake Resistance of the Ministry of Education,Xi’an University of Architecture and Technology,Xi’an 710055,China)

机构地区：[1]西安建筑科技大学土木工程学院,陕西西安710055 [2]西安建筑科技大学结构工程与抗震教育部重点实验室,陕西西安710055

出　　处：《建筑结构学报》2022年第1期59-68,共10页Journal of Building Structures

基　　金：国家自然科学基金项目(51778525,51978565);国家重点研发计划(2016YFC0701403);陕西省杰出青年科学基金项目(2019JC-30)。

摘　　要：为充分发挥装配式混凝土结构施工便捷的特性及钢结构中狗骨式钢梁的抗震性能优势,提出了预制装配式混合框架屈曲约束狗骨式节点。该混合框架节点由预制钢筋混凝土柱和预制钢-混凝土混合梁通过高强螺栓连接而成,其中混合梁由屈曲约束狗骨式钢梁段与混凝土梁段采用高强螺栓连接。完成了2个框架中节点及2个框架边节点的低周往复加载试验。通过对节点的破坏形态、滞回曲线、骨架曲线、耗能能力及变形能力、承载力及刚度退化的研究,对节点类型及梁内是否布置预应力筋对该节点抗震性能的影响进行了分析。研究结果表明:该节点的拼装方式采用全螺栓连接,施工便捷;节点的破坏主要集中于钢梁段,达到了塑性铰外移的目的;节点梁内布置预应力筋能明显提高混凝土梁段的抗裂性能及节点整体抗震能力;提出了该节点中梁端受弯承载力计算方法,试验值与计算值吻合较好。In order to combine the advantages of convenient construction of precast concrete structures and seismic performance of dog-bone-shaped members in steel structures,a novel prefabricated hybrid joint with buckling-restrained dog-bone steel beam was proposed in this paper.The joint was assembled by one precast reinforced concrete column and prefabricated steel-concrete hybrid beams using high-strength bolts,and the hybrid beams were assembled by buckling-restrained dog-bone steel beam section and RC beam section using high-strength bolts.With the aim of investigating the seismic performance of the joints,quasi-static tests of two interior joints and two exterior joints were conducted.Through the analyses of failure modes,hysteretic loops,skeleton curves,cumulative energy dissipation,ductility,strength and stiffness degradation,the effects of joint shape and the application of posttensioning strands were taken into consideration.The results indicate that the joint is assembled completely using high-strength bolts,which can achieve a fast construction.The failure of specimens is basically concentrated in the steel beam section,which achieves the purpose of keeping plastic hinge regions away from the joint core zone.The concrete beam section of the prestressed joints has better crack resistance than the unstressed joint,and the overall seismic performance of the prestressed joint is also improved.The calculation method for the flexural capacity of the beam end in the joint is proposed,which are in good agreement with the test results.

关 键 词：装配式钢-混凝土混合结构 梁柱节点 屈曲约束狗骨式钢梁 拟静力试验 抗震性能 

分 类 号：TU378.4[建筑科学—结构工程] TU317.1