隔板贯通式箱形截面梁柱节点边梁抗震性能研究  

Study on seismic behavior of steel box side beam connected to steel box column with linear strengthened through diaphragm

作　　者：王万祯[1] 朱放[1] 孙韶江 刘涛[1] 郭戈[1] 

机构地区：[1]宁波大学建筑工程与环境学院,浙江宁波315211

出　　处：《建筑结构学报》2016年第11期77-85,共9页Journal of Building Structures

基　　金：基金项目:浙江省"新世纪151人才工程"(11-3-079);宁波市领军和拔尖人才工程

摘　　要：对5个折线加强隔板贯通箱形柱-翼缘开孔箱形边梁框架子结构试件和1个常规隔板贯通箱形柱-箱形边梁框架子结构试件进行了低周往复加载试验,并进行了基于结构钢椭球面断裂模型及耦联的屈服模型的数值分析,对比研究了隔板折线加强和梁翼缘开孔构造对箱形边梁破坏模式、滞回性能、承载力、塑性转角、刚度退化、耗能性能的影响,以及梁端对接焊缝断裂和屈服的演化规律。结果表明：箱形边梁梁端荷载-位移的滞回性能稳定,贯通式隔板“割断”柱的构造对箱形边梁的抗震性能并无影响。常规试件在几何变化剧烈、应力集中严重的箱形梁翼缘对接焊缝处脆断,箱形梁的塑性转角约为0.01 rad;折线隔板加强试件在隔板末端形成塑性铰,极限荷载下箱形梁翼缘对接焊缝被拉断,呈延性破坏。折线隔板加强试件箱形梁的塑性转角可达0.025～0.035 rad,承载力和耗能能力较常规试件分别提高36.3%～62.9%和136%～272%。Quasi-static tests and numerical analysis, based on an elliptical fracture model coupled with an yield model of structural steel, were performed on steel box side beam connected to steel box column with diaphragm , including five specimens with linear strengthened through diaphragm and openings in beam flanges elliptical through and one specimen with conventional through diaphragm. The effects of linear strengthened through diaphragm and openings in beam flanges on failure mode, hysteretic loops, bearing capacity, plastic rotation, stiffness degradation, energy dissipation, evolution law of fracture and yield of steel box side beam connected to steel box column with through diaphragm were studied. The test and numerical analysis results show that the hysteretic loops of beam end load- displacement are very stable and there are no adverse effect of through diaphragm on seismic behavior of steel box side beam connected to steel box column with through diaphragm. The specimen with conventional through diaphragm is brittle fractured at butt weld of beam flanges with the sharply changed geometry where the stress concentration is serious and the plastic rotation of steel box side beam is about 0. 01 rad. For the specimens with linear strengthened through diaphragm, plastic hinges form at the end of the linear strengthened junctures and butt weld of beam flanges ductile fracture in the ultimate loading. The plastic rotation of steel box side beam connected to steel box column with through diaphragm may range from 0. 025 rad to 0. 035 rad and the load bearing capacity and the energy dissipation capacity increase by 36. 3% -62.9% and 136% -272% compared with those of steel box side beam connected to steel box column with conventional through diaphragm.

关 键 词：箱形柱-箱形边梁节点 折线加强贯通隔板 拟静力试验 塑性转角 承载力 耗能能力 

分 类 号：TU391.03[建筑科学—结构工程]