基于理论与LS-DYNA耗能减震棚洞结构研究  

Research on energy dissipation shed-tunnel structure based on theory and LS-DYNA

作　　者：梅华 王星[3,4] 夏永旭 董子文[2] MEI Hua;WANG Xing;XIA Yongxu;DONG Ziwen(School of Architecture Engineering and Art Design,Hunan Institute of Technology,Hengyang Hunan 421002,China;School of Safety and Environment Engineering,Hunan Institute of Technology,Hengyang Hunan 421002,China;Aeronautics Engineering College,Air Force Engineering University,Xi’an 710038,China;School of Highway,Chang’an University,Xi’an 710064,China)

机构地区：[1]湖南工学院建筑工程与艺术设计学院,湖南衡阳421002 [2]湖南工学院安全与环境工程学院,湖南衡阳421002 [3]空军工程大学航空工程学院,西安710038 [4]长安大学公路学院,西安710064

出　　处：《北京交通大学学报》2022年第1期115-122,共8页JOURNAL OF BEIJING JIAOTONG UNIVERSITY

基　　金：国家自然科学基金(51804107);湖南省教育厅科学研究(19C0519,20C0572);衡阳市科技计划(2019jh010652)

摘　　要：落石灾害是我国三大地质灾害之一,现有棚洞结构一旦遭遇落石冲击便导致结构损坏、失效.为了更有效地进行落石冲击防护,基于落石冲击棚洞结构的几何关系,推导出棚洞顶板极限抵抗力与落石平均冲击应力计算式,考虑弗拉索夫板原理得到落石最大冲击应力.通过建立落石冲击棚洞结构的LS-DYNA计算模型,获得在不同冲击速度下顶板腹部正中单元的应力波动曲线.研究表明:以落石平均冲击应力判断棚洞结构安全与否会存在一定偏差;理论与数值模拟算法下棚洞顶板腹部正中单元的最大冲击应力计算结果相吻合;抗冲击力算法、极限抗拉应力算法下,棚洞顶板结构均会在12 m/s落石冲击速度下发生破坏.Rockfall is one of the three major geological disasters in China.Once the existing shed-tunnel structure is impacted by rockfall,it will lead to structural damage and failure.In order to protect the shed from rockfall more effectively,this study deduces the calculation formula of the roof ultimate resistance and the average rockfall impact stress based on the geometric relationship of the shed structure under rockfall impact.It then deduces the maximum rockfall impact stress considering the Vlasov torsion principle.By establishing the LS-DYNA calculation model of shed-tunnel structure under rockfall impact,the stress fluctuation curve of midline unit of middle roof under different impact velocity is obtained.The results show that there is a certain deviation in judging the safety of shed-tunnel structure by the average impact stress of rockfall;the calculation results of the maximum impact stress of the midline unit in the middle roof of the shed tunnel are consistent with the theoretical and numerical simulation results;under the impact resistance algorithm and ultimate tensile strength algorithm,the roof shed-tunnel structure will be destroyed under the impact velocity of 12 m/s.

关 键 词：棚洞结构 落石冲击 理论计算 LS-DYNA 

分 类 号：U458.3[建筑科学—桥梁与隧道工程]