摘要
为研究装配式混凝土框架节点的抗震性能,提出一种基于局部钢套筒与混凝土组合结构形式的梁柱节点,通过螺栓来实现构件间的可靠连接,对其进行了拟静力试验研究,在试验研究的基础上通过ABAQUS软件对结构节点在低周往复加载作用下进行数值分析,并与试验数据进行对比,验证有限元分析的合理性。并采用所建模型增加影响参数范围,分析了相同轴压比下梁纵筋配筋率、端板厚度、加劲肋设置以及螺栓数量对试件的刚度、屈服荷载和极限荷载、耗能等性能的影响。研究结果表明:有限元模拟结果与试验结果吻合较好;纵筋配筋率增加时,节点的承载力、刚度显著提高,但延性和耗能能力降低;通过设置加劲肋,节点的极限承载力、延性、等效黏滞阻尼系数均提高;合理的选择端板厚度,可以使梁内钢筋、预埋的端板和混凝土协同工作,增强节点抗震性能;减少一定数量的螺栓,构件仍能保持可靠连接。
In order to analyze the seismic performance of prefabricated concrete frame joints,a beam and column joint based on the combined structure of local steel sleeve and concrete is proposed,and the reliable connection between components is realized by bolts,and the quasi-static test is carried out on the basis of experimental research,and the numerical analysis of structural joints under low cycle reciprocating loading is carried out through ABAQUS software,and compared with the experimental data to verify the rationality of finite element analysis.Then,the established model is used to increase the range of influencing parameters,and the effects of longitudinal reinforcement ratio,end plate thickness,stiffener setting and bolt number on the stiffness,yield load,ultimate load,energy dissipation and other properties of the specimen under the same axial compression ratio are analyzed.The analysis results show that the results of finite element analysis are in good agreement with the experimental results.When the reinforcement ratio of longitudinal reinforcement increases,the bearing capacity and stiffness of the node are significantly increased,but the ductility and energy dissipation capacity are reduced.By setting stiffeners,the ultimate load,ductility and equivalent viscous damping coefficients of the joint are significantly improved.Reasonable selection of end plate thickness can make the steel bar in the beam,the embedded end plate and the concrete work together to enhance the seismic performance of the joint;By reducing a certain number of bolts,the components can still maintain a reliable connection.
作者
吴东平
裴明晓
李成玉
WU Dongping;PEI Mingxiao;LI Chengyu(School of Urban Construction,Wuhan University of Science and Technology,Wuhan,Hubei 430065,China)
出处
《水利与建筑工程学报》
2023年第2期178-184,212,共8页
Journal of Water Resources and Architectural Engineering
基金
国家自然科学基金(51878522)。
关键词
装配式梁柱节点
抗震性能
有限元模拟
参数分析
prefabricated beam and column joints
seismic performance
finite element simulation
parametric analysis
