摘要
缓冲泡沫构型防护措施具有优良的防护效果,为探究所设计防护的钢筋混凝土(reinforced concrete,RC)柱在碰撞过程中的耗能效果及防撞机理,基于摆锤冲击试验数据,采用LS-DYNA软件对冲击作用下RC柱的动态响应与破坏模式进行数值模拟与模型有效性验证。对比研究了无防护、采用聚氨酯(polyurethanes,PU)泡沫防护以及钢丝网砂浆综合防护等三种措施下的不同设计参数的RC柱抗冲击性能,结果表明,该研究所采取的两种防护措施均可显著提高RC柱抗冲击性能。在摆锤冲击荷载作用下,钢丝网砂浆-PU泡沫防护措施具有优异的抗冲击防护效果,相对于仅使用PU泡沫防护,在同样的防护厚度下,PU泡沫外层设置钢丝网复合砂浆相比来说可以分别降低冲击力峰值与位移峰值约20%、25%;在不同冲击速度下均有较好的耐撞性能,增加缓冲层的厚度与密度均能有效提升RC柱的抗冲击性能。
The cushioning foam structure protection measures exhibit excellent protective effect.To investigate the energy dissipation effect and impact resistance mechanism of the reinforced concrete(RC)columns designed for protection during collisions,based on the pendulum impact test data,numerical simulations were conducted by using LS-DYNA to analyze the dynamic response and failure modes of the RC columns under impact loading,and the effectiveness of the numerical model was validated.The impact resistance of RC columns with three different protective measures:unprotected,polyurethane(PU)foam protection,and a composite protection using wire mesh and mortar was investigated.The results indicate that both of the protective measures designed by the authors can significantly enhance the impact performance of the RC columns.Under pendulum impact loading,the protective measure made of wire mesh-mortar composite with PU foam demonstrates excellent impact resistance.Specifically,compared to PU foam protection alone,incorporating wire mesh with composite mortar on the outer layer of PU foam reduces the peak impact force and displacement by approximately 20%and 25%,respectively,with the same protective thickness.The columns demonstrate enhanced impact resistance at various impact velocities,and increasing the thickness and density of the cushioning layer effectively improves the impact resistance of the RC columns.
作者
何庆锋
张俊峰
易帆
唐志龙
HE Qingfeng;ZHANG Junfeng;YI Fan;TANG Zhilong(Department of Civil Engineering,Hunan University,Changsha 410082,China)
出处
《振动与冲击》
北大核心
2025年第14期120-131,共12页
Journal of Vibration and Shock
基金
国家自然科学基金面上项目(52478169)。
作者简介
第一作者:何庆锋,男,工学博士,高级工程师,1979年生,E-mail:sammyhqf@163.com。
