落石冲击荷载作用下EPE垫层棚洞缓冲作用研究  

Study on the cushioning properties of shed with EPE cushion under rock-fall load

作　　者：黎良仆 袁松[3] 谢凌志[2,4] 赵鹏[1,2] 

机构地区：[1]四川大学建筑与环境学院,四川成都610065 [2]能源工程安全与灾害力学教育部重点实验室,四川成都610065 [3]四川省交通运输厅交通勘察设计研究院,四川成都610065 [4]四川大学新能源与低碳技术研究院,四川成都610065

出　　处：《四川建筑科学研究》2016年第3期46-49,共4页Sichuan Building Science

基　　金：四川省交通科技项目(2012B4-2)

摘　　要：针对目前棚洞结构传统砂垫层自重大、建设成本高等缺点的现状,提出使用EPE(聚乙烯)缓冲材料替换一部分砂土垫层以达到减轻结构自重、提高抗落石冲击性能的目的。采用显式动力计算,基于LS-DYNA动力有限元软件建立数值计算模型,模拟了落石冲击EPE垫层棚洞结构的全过程,以棚洞结构底部钢筋动态应变时程曲线、棚洞T型梁跨中挠度变形等为依据,判断结构的极限承载力,并与传统砂垫层进行了对比,从而揭示了EPE垫层在棚洞结构设计中的耗能减震作用。结果表明:EPE缓冲材料的缓冲性能与抗冲击性能较好,能广泛应用于实际工程;其最优填充厚度为0.6 m,结构承载力是传统砂垫层棚洞结构的1.75倍。The main shortages of conventional concrete shed is heavy load of dead weight,and constructing such a structure is usually expensive due to sand cushion. In order to tackle this issue,a proposal was made to replace a part of sand filling with EPE（ Expandable Polyethylene） material. By using the explicit algorithm of LS-DYNA,simulation of the whole process of rock-fall impact on the structure with EPE cushion was made. Based on the results of simulation,and compared with the conventional shed,the results show that at the same impact energy,the EPE cushion can dissipate more impact force with the optimal thickness is 0. 6 m,and the structure carrying capacity is 1. 75 times that of traditional shed.

关 键 词：棚洞 落石冲击 数值分析 EPE垫层 冲击响应 

分 类 号：TU375.4[建筑科学—结构工程]