狗骨式钢结构梁柱节点的冲击荷载试验研究和有限元分析  

Tests and FE analysis for impact behavior of RBS beam-column connections of steel frames

作　　者：王海涛[1] 张素清 霍静思[1,2] WANG Haitao;ZHANG Suqing;HUOJingsi(MOEKey Lab of Building Safety and Energy Efficiency,Hunan University,Changsha 410082,China;College of Civil Engineering,Huaqiao University,Xiamen 361021,China)

机构地区：[1]湖南大学教育部建筑安全与节能重点实验室,长沙410082 [2]华侨大学土木工程学院,福建厦门361021

出　　处：《振动与冲击》2018年第11期107-114,共8页Journal of Vibration and Shock

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)

摘　　要：设计采用FEMA标准过焊孔构造的2个削弱型狗骨式全焊连接的钢结构梁柱节点试件,对试件施加落锤冲击荷载来模拟结构的动态倒塌效应,考察狗骨式节点削弱程度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荷载和位移时程曲线,分析试件冲击过程动态响应规律以及节点动态转角和耗能能力。试验结果表明:节点试件的主要破坏形态是钢梁塑性铰截面上翼缘屈服的面外变形和腹板扭曲变形;2个节点试件均具有良好的抗冲击转动能力,其最大转角均远远超过FEMA350标准抗震设计的转角限值(θ=0.077 rad)要求;削弱型狗骨式全焊连接节点相对普通全焊接节点的耗能能力和延性均明显提高。采用ABAQUS软件建立了狗骨式梁柱节点子结构的有限元分析模型,通过分析狗骨式梁柱节点在冲击作用下内力发展规律可知,狗骨式节点设计有助于构件向悬链线效应转换。Two reduced beam section（ RBS） welded beam-column connection specimens of steel frames with FEMA standard over-welded hole structure were designed. Impact tests using drop-hammer were conducted to simulate structure’s collapse behavior under impact loading to observe effects of RBS beam-column connection on impact resistance performance of steel frame beam-column connections. The connection specimens’ failure modes and time histories of impact load and deformation were obtained. The dynamic response laws of specimens,connections’ dynamic rotary angle and energy dissipation capacity were analyzed. Test results showed that the failure modes of RBS welded beam-column connection specimens mainly are out-of-plane deformation and web distortional one due to upper flange yield of steel beam plastic hinge section; two specimens have a good rotary capacity to resist impact loading,while their maximum rotary angles far exceed the FEMA350 design limit θ = 0. 077 rad）; their energy dissipation capacity and ductility are superior to those of the ordinary welded connections. The FE model for RBS welded beam-column connection structure was established using the software ABAQUS. The internal force varying law of specimens during impact loading was analyzed.It was shown that RBS welded beam-column connection design is helpful for the transfer of structural deformation to the catenary effect.

关 键 词：钢框架梁柱节点 狗骨式 动力性能 延性 有限元 内力分析 

分 类 号：TU392[建筑科学—结构工程]