钢框架加强型梁柱节点子结构的抗冲击性能试验研究

发布时间：2018-10-11 08:53

【摘要】：设计了采用FEMA 350过焊孔构造的1个普通栓焊连接和2个加强型(盖板和翼缘加强型)栓焊连接的钢框架梁柱节点子结构试件,对试件进行落锤冲击来模拟结构的动态倒塌过程,考察栓焊节点加强方式对钢框架梁柱节点抗冲击性能的影响。通过试验获得节点试件的破坏形态及其冲击作用和位移时程曲线,分析试件冲击作用和位移时程响应规律以及子结构动态转角和耗能变化趋势。试验结果表明:节点试件的主要破坏形态是显著整体弯曲变形和钢梁上翼缘塑性铰截面附近处受压屈曲,采用FEMA 350标准过焊孔构造的节点试件具有良好的抗冲击转动能力,3个试件的极限转角均达到了FEMA 350规范抗震设计的转角限值(普通栓焊节点为θ=0.054 rad、加强型节点为θ=0.070 rad)要求;改进后的盖板加强型和翼缘加强型节点试件的抗冲击能力均得到显著提高,优于普通栓焊节点。通过分析冲击过程中试件截面内力发展规律可知,由于节点过早破坏,限制了悬链线效应的形成,所有试件最终还处于塑性受弯向悬链线发展阶段。
[Abstract]:A substructure specimen of Liang Zhu joint of steel frame with FEMA 350 overwelding hole is designed, which is composed of one common bolted joint and two reinforced type (cover plate and flange reinforced type). The impact of drop hammer is carried out to simulate the dynamic collapse process of the structure. The effect of bolted joint reinforcement on impact resistance of Liang Zhu joint of steel frame was investigated. The failure pattern of the joint specimen and its impact action and displacement time history curve were obtained through the test. The impact action and displacement time history response law of the specimen and the changing trend of dynamic rotation angle and energy dissipation of the substructure were analyzed. The experimental results show that the main failure modes of the joint specimens are significant global bending deformation and compressive buckling near the plastic hinge section of the upper flange of the steel beam. The joint specimens constructed with FEMA 350 standard overwelded holes have good anti-impact rotation ability, and the limit angle of the three specimens is up to the limit value of the seismic design of FEMA 350 code (胃 = 0.054 rad, reinforced joint 胃 = 0.070 rad). The impact resistance of the improved plate reinforced joints and flange strengthened joints is improved significantly, which is superior to that of the common bolted joints. By analyzing the law of internal force development in the section of specimen during impact, it can be seen that due to premature failure of joints, the formation of catenary effect is limited, and all specimens are still in the stage of plastic bending catenary development.
【作者单位】：湖南大学教育部建筑安全与节能重点实验室;华侨大学土木工程学院;
【基金】：国家自然科学基金项目(51078139) 教育部新世纪优秀人才计划项目(NCET-11-0123)
【分类号】：TU391

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