节点连接方式对BRBF结构抗震性能的影响研究  

Research on the influence of node connection mode on the seismic performance of BRBF structure

作　　者：虞爱平 毛飞腾[2] 刘祥泰 王翠红 陈宣东 Yu Ai-ping;Mao Fei-teng;Liu Xiang-tai;Wang Cui-hong;Chen Xuan-dong(Guangxi Key Laboratory of Geomechanics and Geotechnical Engineering,Guilin 541004,China;College of Civil Engineering and Architecture,Guilin University of Technology,Guilin 541004,China)

机构地区：[1]广西岩土力学与工程重点实验室,广西桂林541004 [2]桂林理工大学土木与建筑工程学院,广西桂林541004

出　　处：《工程抗震与加固改造》2022年第6期15-21,共7页Earthquake Resistant Engineering and Retrofitting

基　　金：国家自然科学基金资助项目(51968014);广西岩土力学与工程重点实验室资助项目(2015-B-01)。

摘　　要：梁柱节点刚接形式在工程抗震结构上应用较为广泛,但不可拆卸,不易于现场施工,螺栓连接具有结构简单、连接可靠、装卸方便等优点,在一定程度上可以替代刚接。为了探究梁柱节点连接方式对于屈曲约束支撑钢框架(BRBF)结构抗震性能的影响,设计了梁柱节点连接方式分别为刚接和螺栓连接,屈曲约束支撑BRB水平力分担率β分别为20%、30%、40%的6个研究模型,利用CLAP软件分析了各个模型的塑性铰形成顺序以及7条地震波在峰值加速度分别为400cm/s2、620cm/s2时的最大层间位移、最大层剪力和塑性能力。结果表明:各模型最大层间位移均控制在1/250~1/50范围内,梁柱节点由刚接转变为螺栓连接后,最大层间位移增大,当地震峰值加速度为600cm/s2时,相同β值的2种连接模型的最大层间位移相差分别为1.54、2.26、1.47cm;螺栓连接的耗能减震效果比刚接模型更好,且随着地震峰值加速度的增大,螺栓连接节点发挥出其耗能减震的效果越明显。Rigid connection of beam-column nodes is widely used in engineering seismic structures, but it cannot be disassembled and is not easy for on-site construction. Bolted connection has the advantages of simple structure, reliable connection, convenient installation and unloading, and can replace rigid connection to a certain extent. In order to study the influence of the beam-column joints on the seismic performance of buckling restrained braced frame(BRBF), six models with rigid connection and bolt connection, buckling-restrained brace(BRB)horizontal force sharing rate β of 20%, 30%, 40% are designed, the plastic hinge formation sequence of each model and the maximum interlayer displacement, maximum layer shear force and plastic capacity when the peak accelerations of 7 seismic waves are 400 cm/s~2 and 620 cm/s~2 respectively are conducted in CLAP. The results show that the maximum inter-story displacement of each model is controlled within the range of 1/250~1/50. After the beam-column connection is changed from rigid connection to bolt connection, the maximum inter-story displacement increases. When the seismic peak acceleration is 600 cm/s~2, the maximum displacement difference between the two connection models with the same β value is 1.54 cm, 2.26 cm, 1.47 cm, respectively;the energy dissipation and shock absorption effect of the bolt connection is better than that of the rigid connection model, and with the increase of the seismic peak acceleration, the effect of bolted joints on energy consumption and shock absorption is more obvious.

关 键 词：BRBF结构 节点刚接 节点螺栓连接 抗震性能 

分 类 号：TU973.13[建筑科学—结构工程] TU973.31