摘要
结合钢管混凝土(CFST)柱和钢筋混凝土(RC)梁各自的优点,提出一种采用U形钢板-栓钉组合连接的新型CFST柱-RC梁节点.为研究新型节点的抗震性能,设计并制作了2个足尺CFST柱-RC梁节点及1个传统的RC节点试件,对其进行了低周往复荷载作用下的试验研究.结果表明:该类新型CFST柱-RC梁节点破坏模式与传统的RC节点相似,均发生梁端弯曲破坏,破坏区域主要在U形连接板外,实现塑性铰外移.按照试验现场的试件安装位置,十字节点的梁分别命名为S梁和N梁.CFST中柱节点、CFST边节点N梁承载力较RC节点分别提高11.6%(负向提高13.0%)和5.3%(负向提高7.5%);中柱节点的S梁承载力提高20.2%(负向提高19.6%).荷载-位移曲线饱满,累计耗能与RC节点相比提高约17.0%(S梁提高36.0%)、20.1%,各试件的位移延性系数均大于4.0,新型CFST柱-RC梁中柱节点、边节点的位移延性系数分别提高2.4%、21.3%,具有较好的变形能力.
Based on the advantages of concrete filled steel tube(CFST)column and reinforced concrete(RC)beam,a new type of CFST column-RC beam joint connected by U-shaped steel plate and studs is proposed in this paper.In order to study the seismic performance of the new type of joint,two full-scale CFST column-RC beam joints and one traditional RC joint were designed and manufactured,and the low-cycle reciprocating load test was carried out.Results show that the failure mode of the CFST column-RC beam joint was similar to that of the traditional RC joint that both of the joints had flexural failure at beam ends.The failure area was mainly outside the U-shaped steel plate edge,and the plastic hinge area moved outwards.The beams of the cross joint were named as S beam and N beam according to the specimen installation positions of the test site.Compared with the RC joint,the bearing capacity of the N beam of CFST column interior joint and side joint increased by 11.6%(13.0%in negative direction)and 5.3%(7.5%in negative direction)respectively,and that of the S beam of the CFST column interior joint increased by 20.2%(19.6%in negative direction).The load-displacement hysteresis curves showed a plump shape.The accumulative energy dissipation of the CFST column interior joint and side joint increased by 17.0%(36.0%for S beam)and 20.1%compared with the RC joint.The displacement ductility coefficient of each specimen was higher than 4.0,and that of the interior joint and side joint of the CFST column-RC beam increased by 2.4%and 21.3%.Therefore,the new type of CFST column-RC beam joint showed good deformation ability.
作者
刘亚双
李振宝
马华
王倩倩
LIU Yashuang;LI Zhenbao;MA Hua;WANG Qianqian(The Key Lab of Urban Security and Disaster Engineering(Beijing University of Technology),Ministry of Education,Beijing 100124,China;College of Exploration Technology and Engineering,Hebei GEO University,Shijiazhuang 050031,China)
出处
《哈尔滨工业大学学报》
EI
CAS
CSCD
北大核心
2020年第8期20-29,共10页
Journal of Harbin Institute of Technology
基金
国家重点研发计划(2016YFC0701100)。
