爆炸与冲击2025，Vol.45Issue(4)：122-132,11.DOI:10.11883/bzycj-2024-0192
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
摘要
Abstract
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Key words
lattice columns/secondary impact/dynamic response/energy distribution分类
数理科学引用本文复制引用
陈鹏程,尹小莉,王琳,路国运,焦晋峰..连续两次侧向冲击下格构式钢构件的力学性能[J].爆炸与冲击,2025,45(4):122-132,11.基金项目
国家自然科学基金(12172244) （12172244）
山西省基础研究计划资助项目(202103021223105,202203021211184,202203021212256) （202103021223105,202203021211184,202203021212256）
山西省住建厅科学技术计划项目(K20220319) （K20220319）
