初始损伤金属耗能器冲击动力特性研究
发布时间：2018-10-08 17:15
【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。
[Abstract]:In order to absorb the impact energy of rolling stone, the impact force of rolling stone can be minimized by setting metal energy dissipation device to replace the traditional sand and stone cushion at the support of shed hole. The commonly used metal dampers have the defect that the initial yield load is much higher than the average collapse load. For this reason, a new type of metal energy dissipation device with initial damage is proposed. By reducing its initial yield load, the purpose of optimizing the greenhouse tunnel project is achieved. Based on LS-DYNA, the dynamic response of metal dampers with different initial damage modes under axial impact load is studied, and the failure mode, the relationship between impact force and displacement and the energy dissipation effect are compared. The results show that the reasonable initial damage setting can effectively reduce the initial yield load of the metal dampers up to 40, while the average collapsing load and the total energy absorbed remain basically unchanged. The research results can provide the basis for the application of metal energy dissipation device in greenhouse tunnel engineering.
【作者单位】： 中国科学院水利部山地灾害与地表过程重点实验室;中国科学院水利部山地灾害与环境研究所;中国科学院大学;中国科学院青藏高原地球科学卓越创新中心;成都理工大学地质灾害与地质环境保护国家重点实验室;
【基金】：国家自然科学基金项目(41272346,41502297)资助
【分类号】：O347.5
本文编号：2257609
[Abstract]:In order to absorb the impact energy of rolling stone, the impact force of rolling stone can be minimized by setting metal energy dissipation device to replace the traditional sand and stone cushion at the support of shed hole. The commonly used metal dampers have the defect that the initial yield load is much higher than the average collapse load. For this reason, a new type of metal energy dissipation device with initial damage is proposed. By reducing its initial yield load, the purpose of optimizing the greenhouse tunnel project is achieved. Based on LS-DYNA, the dynamic response of metal dampers with different initial damage modes under axial impact load is studied, and the failure mode, the relationship between impact force and displacement and the energy dissipation effect are compared. The results show that the reasonable initial damage setting can effectively reduce the initial yield load of the metal dampers up to 40, while the average collapsing load and the total energy absorbed remain basically unchanged. The research results can provide the basis for the application of metal energy dissipation device in greenhouse tunnel engineering.
【作者单位】： 中国科学院水利部山地灾害与地表过程重点实验室;中国科学院水利部山地灾害与环境研究所;中国科学院大学;中国科学院青藏高原地球科学卓越创新中心;成都理工大学地质灾害与地质环境保护国家重点实验室;
【基金】：国家自然科学基金项目(41272346,41502297)资助
【分类号】：O347.5
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