梁端翼缘削弱型节点空间钢框架抗震性能试验研究
发布时间：2018-11-08 12:45
【摘要】：为研究梁端翼缘削弱型节点钢框架的抗震性能,设计钢框架试验加载装置,进行1∶3缩尺比例的2榀2层1跨梁端翼缘削弱型节点空间钢框架的低周往复荷载试验,研究其受力特点及破坏形态,对模型框架结构的荷载-位移滞回曲线、骨架曲线、刚度退化、承载力退化、塑性耗能能力等抗震性能进行分析。试验结果表明:空间钢框架的8个梁端翼缘削弱型节点塑性铰均外移至圆弧削弱区域,所有节点的梁柱连接焊缝均未出现裂缝,荷载-位移滞回曲线饱满,破坏时结构位移延性系数介于3.05~3.82之间,等效黏滞阻尼系数介于0.34~0.41之间,弹塑性极限位移层间转角介于0.035 5~0.044 5 rad之间。钢框架梁柱连接采用圆弧削弱型节点可使梁端应力平缓过渡,避免梁柱连接焊缝处产生应力集中现象,钢框架塑性内力重分布后对圆弧削弱型节点的耗能性能没有明显影响。圆弧削弱型节点在钢框架中表现出较好的延性性能,提高了钢框架整体结构的抗震性能及塑性耗能能力。
[Abstract]:In order to study the seismic behavior of steel frame with weakened flange at beam end, the experimental loading device of steel frame was designed, and the low cycle reciprocating load test of 2 steel frames with 2 stories and 1 span flange weakening joint at 1:3 scale was carried out. The load-displacement hysteretic curve, skeleton curve, stiffness degradation, bearing capacity degradation and plastic energy dissipation capacity of the model frame structure are analyzed. The test results show that the plastic hinge of 8 beam flange weakened joints in the space steel frame is moved outward to the arc-weakening zone, and no cracks are found in the joint weld of all the joints, and the load-displacement hysteretic curve is full. The displacement ductility coefficient of the structure is between 3.05 and 3.82, the equivalent viscous damping coefficient is between 0.34 and 0.41, and the rotation angle of the elastic-plastic limit displacement layer is between 0.035 5 and 0.044 5 rad. The circular arc weakening joint used in the connection of steel frame Liang Zhu can make the stress of beam end smooth transition and avoid the phenomenon of stress concentration in the welds of Liang Zhu connection. After the distribution of plastic internal force of steel frame is redistributed, the energy dissipation performance of circular arc weakening joint is not obviously affected. The circular arc-weakened joints exhibit better ductility in steel frames and improve the seismic performance and plastic energy dissipation capacity of the steel frame structure as a whole.
【作者单位】： 青岛理工大学土木工程学院;
【基金】：国家自然科学基金项目(51278259)
【分类号】：TU391;TU352.11
本文编号：2318544
[Abstract]:In order to study the seismic behavior of steel frame with weakened flange at beam end, the experimental loading device of steel frame was designed, and the low cycle reciprocating load test of 2 steel frames with 2 stories and 1 span flange weakening joint at 1:3 scale was carried out. The load-displacement hysteretic curve, skeleton curve, stiffness degradation, bearing capacity degradation and plastic energy dissipation capacity of the model frame structure are analyzed. The test results show that the plastic hinge of 8 beam flange weakened joints in the space steel frame is moved outward to the arc-weakening zone, and no cracks are found in the joint weld of all the joints, and the load-displacement hysteretic curve is full. The displacement ductility coefficient of the structure is between 3.05 and 3.82, the equivalent viscous damping coefficient is between 0.34 and 0.41, and the rotation angle of the elastic-plastic limit displacement layer is between 0.035 5 and 0.044 5 rad. The circular arc weakening joint used in the connection of steel frame Liang Zhu can make the stress of beam end smooth transition and avoid the phenomenon of stress concentration in the welds of Liang Zhu connection. After the distribution of plastic internal force of steel frame is redistributed, the energy dissipation performance of circular arc weakening joint is not obviously affected. The circular arc-weakened joints exhibit better ductility in steel frames and improve the seismic performance and plastic energy dissipation capacity of the steel frame structure as a whole.
【作者单位】： 青岛理工大学土木工程学院;
【基金】：国家自然科学基金项目(51278259)
【分类号】：TU391;TU352.11
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1 郁有升;王建;黄伟平;王燕;;钢框架梁柱弱轴栓焊混合连接翼缘削弱型节点破坏形态试验研究[J];建筑结构;2014年17期
，本文编号：2318544
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