连续两次侧向冲击下格构式钢构件的力学性能  

Mechanical performance of lattice steel columns under two consecutive lateral impacts

作　　者：陈鹏程 尹小莉 王琳 路国运[1] 焦晋峰 CHEN Pengcheng;YIN Xiaoli;WANG Lin;LU Guoyun;JIAO Jinfeng(College of Civil Engineering,Taiyuan University of Technology,Taiyuan 030024,Shanxi,China;Shanxi Second Construction Group Co.,Ltd.,Taiyuan 030013,Shanxi,China;Department of Architecture and Civil Engineering,Lyuliang University,Lyuliang 033001,Shanxi,China)

机构地区：[1]太原理工大学土木工程学院,山西太原030024 [2]山西二建集团有限公司,山西太原030013 [3]吕梁学院建筑与土木工程系,山西吕梁033001

出　　处：《爆炸与冲击》2025年第4期122-132,共11页Explosion and Shock Waves

基　　金：国家自然科学基金(12172244);山西省基础研究计划资助项目(202103021223105,202203021211184,202203021212256);山西省住建厅科学技术计划项目(K20220319)。

摘　　要：格构柱是工程结构中的主要承重构件,为评估格构柱在冲击载荷下的防护性能并优化其设计,对格构柱沿不同冲击方向进行了二次冲击试验,并与相同总能量下的单次冲击试验进行了对比,分析了格构柱在冲击荷载下的受力和变形特点。随后,基于试验验证的有限元模型对足尺格构柱进行连续二次冲击模拟,得到了总能量不变时遭受2次连续冲击的格构柱的动力响应,分析了不同能量分配对冲击力、残余位移和残余动能的影响。结果表明:总能量相同时,单次冲击作用下格构柱的位移大于二次冲击,数值模拟中,最优能量分配可使沿不同方向冲击的构件残余位移减小约12%;当格构柱第1次受到的冲击能占比越大,第2次受到的冲击能占比越小时,格构柱吸收的总能量越小。最终,基于试验与数值模拟结果,提出受损柱能承受第2次冲击的最大冲击速度的计算方法。The evaluation of protective performance and optimization of the design of building structures under impact loading is a key issue of concern in the fields of national defense,civil engineering,and other military and civilian use.Lattice columns are often used as the main load-bearing components in engineering structures and are inevitably impacted by other unintentional loads under engineering service environments.In this paper,1∶2 scaled-down secondary impact tests were carried out on lattice columns along different impact directions with the same impact energy each time and compared with single-impact lattice columns under the same total energy to analyze the force and deformation characteristics of the lattice columns under the impact loads.Then,based on the experimentally verified finite element model,a continuous secondary impact simulation was carried out on the foot-foot lattice column.The dynamic response of the lattice column subjected to two consecutive impacts with the same total energy was obtained,and the effects of different energy distributions on the impact force,residual displacement,and residual kinetic energy were analyzed.The results show that under the same total energy,the displacement of lattice columns under a single impact is greater than that of a secondary impact.The optimal energy distribution obtained by numerical simulation can reduce the residual displacement of members impacted along different directions by about 12%.When the lattice column is subjected to a larger proportion of energy for the first time or a smaller proportion of impact energy for the second time,the total energy absorbed by the column is smaller.Finally,based on the results of tests and numerical simulations,the maximum impact velocity at which the damaged column can withstand a second impact is proposed.The results of the study can provide a reference for the design method of lattice steel columns under such loading conditions.

关 键 词：格构柱 二次冲击 动力响应 能量分配 

分 类 号：O347[理学—固体力学] TU392.1[理学—力学]