初始损伤金属耗能器冲击动力特性研究  

Dynamic Behavior Analysis of Metal Energy Absorbers with Initial Damage under Impact

作　　者：闫帅星 何思明[1,2,4] 王东坡[5] 毕钰璋 

机构地区：[1]中国科学院水利部山地灾害与地表过程重点实验室,成都610041 [2]中国科学院水利部山地灾害与环境研究所,成都610041 [3]中国科学院大学,北京100049 [4]中国科学院青藏高原地球科学卓越创新中心,北京100101 [5]成都理工大学地质灾害与地质环境保护国家重点实验室,成都610059

出　　处：《科学技术与工程》2016年第16期1-8,共8页Science Technology and Engineering

基　　金：国家自然科学基金项目(41272346,41502297)资助

摘　　要：通过在棚洞支座处设置金属耗能器代替传统砂石垫层,吸收滚石冲击能量,可最大程度减小滚石冲击力。常用的金属耗能器存在初始屈服荷载远高于平均压垮荷载的缺陷。为此,提出一种新型带初始损伤的金属耗能器,通过降低其初始屈服荷载,达到优化棚洞工程的目的。基于LS-DYNA研究轴向冲击荷载下不同初始损伤模式金属耗能器的动力响应,比较了其破坏模式、冲击力-位移关系与耗能效果。结果表明:合理的初始损伤设置可有效降低金属耗能器初始屈服荷载达40%;而平均压垮荷载、吸收的总能量基本保持不变,研究成果可为金属耗能器在棚洞工程中的应用提供依据。New-typed structurally dissipating rock-shed can maximum decrease rock-fall impact force and reduce engineering investment by installing metal shock absorbers. Traditional energy absorber has a peak yield load which is much larger than average post buckling load,thus the rock-shed RC slab is requested a larger shock resistance and higher investment. A new metal energy absorber with initial damage is proposed to reduce the maximum load while maintaining the effect of energy absorption. The dynamic response of metal absorbers with different initial damage modes under axial impact is studied by LS-DYNA,failure modes,force-displacement response and energy dissipation are compared. Results show that,reasonable initial damage can effectively reduce peak yield load up to40%,while average collapse load,total energy absorption remain basically unchanged,thus the metal energy absorber is optimized.

关 键 词：初始损伤 棚洞 金属耗能器 动力响应 

分 类 号：O347.3[理学—固体力学]