钢管混凝土柱−钢梁下栓上焊隔板贯通节点抗震试验研究  

Experimental study on seismic performance of bottom-flange-bolted upper-flange-welded through-diaphragm connection between CFST column and steel beam

作　　者：余玉洁 林思文 张超 丁发兴[1,2] 蒋丽忠 魏标[1] YU Yujie;LIN Siwen;ZHANG Chao;DING Faxing;JIANG Lizhong;WEI Biao(School of Civil Engineering,Central South University,Changsha 410075,China;Engineering Technology Research Center for Prefabricated Construction Industrialization,Changsha 410075,China)

机构地区：[1]中南大学土木工程学院,湖南长沙410075 [2]湖南省装配式建筑工程技术研究中心,湖南长沙410075

出　　处：《中南大学学报（自然科学版）》2022年第6期2143-2154,共12页Journal of Central South University:Science and Technology

基　　金：国家自然科学基金资助项目(51708402)。

摘　　要：钢管混凝土柱−钢梁下栓上焊隔板贯通节点下翼缘采用螺栓连接代替传统的对接焊缝连接,以解决下翼缘焊缝处容易发生断裂的问题,但该构造使得钢梁上下翼缘的连接方式不对称。为此,通过对5个下栓上焊隔板贯通节点和1个传统栓焊混合连接节点进行低周往复荷载试验,研究下翼缘螺栓连接和楼板的组合作用对下栓上焊节点抗震性能和工作机理的影响。研究结果表明:下栓上焊节点中由于下翼缘处螺栓滑移导致其滞回曲线表现出一定程度的捏缩现象,但该类节点具有较强的变形能力,可转动0.06000 rad且不破坏;随着节点转角增大,下翼缘连接传力机制由摩擦传力转变为螺杆与孔壁的接触承压传力,节点具有较强的极限承载能力;上下翼缘连接方式不同导致节点正负向受弯时表现出非对称承载强度;无楼板节点具有较大的负弯矩强度,采用组合式楼板时,混凝土板与立柱的挤压承载对于节点正向承载能力有更显著的增强效应,最终使得组合梁节点的正负向弯曲承载强度相近;楼板可有效抑制钢梁上翼缘的局部鼓曲变形,延缓节点的峰值后承载力退化现象;下翼缘螺栓连接的板件滑移有助于降低钢梁下翼缘应力集中现象,避免出现过早断裂的脆性破坏;通过提高下翼缘螺栓连接强度和下贯通隔板厚度,可以增大节点的承载稳定性和变形能力。The bottom-flange-bolted upper-flange-welded(BFB-UFW)through-diaphragm concrete filled steel tube(CFST)column connection adopts the bolted connection instead of traditional welded approach to connect the bottom flange to the bottom diaphragm.The construction can solve the brittle rupture failure problem of the bottom flange welds,but also induces the asymmetric connecting construction between upper and bottom flanges.In order to investigate the influence of bottom-flange-bolted connection and composite beam effect on seismic performance of the BFB-UFW connection,cyclic loading tests were performed on five BFB-UFW connections and one traditional welded flange through-diaphragm connection.The results show that BFB-UFW connections have pinched hysteretic loops due to the bolt sliding behaviors in the bottom flange connection,but this connection has strong deformation ability with a drift angle of 0.06000 rad.The working mechanism of the bottom flange connection changes from the contact friction resistance to bolt bearing when the drift angle increases,leading to the stronger ultimate bearing capacity.Different connecting methods in the upper and bottom flanges will cause asymmetric moment strength developments in upward and downward bending conditions.The bare beam connection has a higher level of negative moments than positive strengths.However,the extrusion between slab and column in the composite beam connection imposes a stronger strengthening effect on the positive moment strength,leading to similar positive and negative strength levels.The slab can effectively restrain the local buckling deformation at upper beam flange and delay the strength degradation behavior.The bolted bottom flange design and the plate sliding behaviors can reduce stress concentrations at the bottom flange,which effectively reduces brittle failure risks from the premature fracture.The bearing stability and deformation capacity of BFBUFW connections can be strengthened by increasing the strength of bolted bottom flange connection and the

关 键 词：钢管混凝土柱 组合梁 滞回性能 抗弯强度 层间位移角 摩擦滑移 

分 类 号：TU398.2[建筑科学—结构工程]