冲击作用下钢框架狗骨式梁柱子结构动态性能分析  

Dynamic performance analysis of steel frame reduced beam section connections under impact loading

作　　者：彭维弟 刘康宁[2] PENG Weidi;LIU Kangning(Gansu Wantai Construction Engineering Co.Ltd.,Lanzhou 730000,China;SCEGC-XJTU Joint Research Center for Future City Construction and Management Innovation,Xi'an Jiaotong University,Xi'an 710116,China)

机构地区：[1]甘肃万泰建设工程有限公司,甘肃兰州730000 [2]陕西建工集团西安交通大学未来城市建设与管理创新联合研究中心,陕西西安710116

出　　处：《兵器材料科学与工程》2025年第2期78-86,共9页Ordnance Material Science and Engineering

基　　金：甘肃省教育厅青年博士基金(2022QB-210);陕西省自然科学基金(2021JQ-844)。

摘　　要：用Abaqus软件对狗骨式节点试件的落锤冲击试验进行数值模拟,通过有限元结果与试验结果对比,验证有限元建模方法的正确性,并探究落锤质量与冲击速度对狗骨式结构冲击力和竖向位移的影响,同时,分析了不同削弱区域尺寸在落锤冲击下的冲击力、冲击时程、竖向位移及破坏模式的变化规律。结果表明:狗骨式结构动力响应分为惯性力阶段、平台力阶段和分离阶段;落锤质量对冲击力峰值影响较小,但与落锤速度呈正相关;平台冲击力与落锤质量和速度均呈正相关,速度对冲击时程影响更显著;在相同能量下,改变落锤质量的最大平台冲击力与最大位移均大于改变落锤速度时的对应值;狗骨式结构破坏模式随冲击能量增大,应力集中在削弱区域,初期钢梁下翼缘断裂,随后扩展至梁腹板和上翼缘,最终导致整体断裂,削弱区域长度b会影响结构的破坏模式;削弱区域离梁端越远,结构越早破坏但承载力影响较小;结构的破坏位置约在距离削弱区域的40%处;削弱区域长度b增大会显著增加破坏时冲击力和延性,延长破坏时间。bstract This study used Abaqus software to perform numerical simulations of drop⁃weight impact tests on reduced beam section connection specimens.The accuracy of the finite element modeling method was verified by comparing the finite element results with experimental data.The study also explored the effects of drop hammer mass and impact velocity on the impact force and vertical displacement of reduced beam section structures.Additionally,it analyzed the variation patterns of impact force,impact duration,vertical displacement,and failure mode under different sizes of weakened areas during drop hammer impact.The results show that the dynamic response of reduced beam section structures can be divided into inertial force phase,platform force phase and separation phase.The impact force peak is minimally affected by the drop hammer mass but is positively correlated with the impact velocity.Both platform impact force and impact velocity has significant positive correlations,with velocity having a more pronounced effect on the impact duration.Under the same energy,the maximum platform impact force and displacement are greater when changing the drop hammer mass than when changing the impact velocity.The failure mode of reduced beam section structures show stress concentration in the weakened region,with initial fractures occurring at the lower flange of the steel beam,then extending to the web and upper flange,ultimately leading to total fracture.The Increased length b of the weakened area affected the failure mode of the structure.As the weakened region moved further from the beam end,the structure failed earlier with a smaller effect on bearing capacity.The failure location of the structure is about 40%away from the weakened area.Increased length b of the weakened area significantly raised the impact force and ductility during failure,prolonging the failure time.

关 键 词：连续倒塌 狗骨式连接 数值模拟 梁柱子结构 落锤冲击 

分 类 号：TU398.9[建筑科学—结构工程] TU317.1