Geiger型索穹顶冲击动力响应与失效机理研究  

Dynamic response and failure mechanism of Geiger cable dome stractures under impact load

作　　者：陈联盟[1] 黄奔程 曾一洪 李泽斌 黄开宇 李桅[1] 董石麟[2] CHEN Lianmeng;HUANG Bencheng;ZENG Yihong;LI Zebin;HUANG Kaiyu;LI Wei;DONG Shilin(College of Civil Engineering and Architecture,Wenzhou University,Wenzhou 325035,China;Space Structures Research Center,Zhejiang University,Hangzhou 310027,China)

机构地区：[1]温州大学建筑工程学院,浙江温州325035 [2]浙江大学空间结构研究中心,杭州310027

出　　处：《振动与冲击》2024年第18期145-154,共10页Journal of Vibration and Shock

摘　　要：针对当前索穹顶结构缺乏冲击荷载作用下结构动力响应和失效机理的研究现状,该文基于ANSYS/LS-DYNA分析软件,提出了Geiger型索穹顶结构冲击动力分析模型,详细分析了冲击作用下结构的节点位移和杆件内力响应,并进一步结合美国规范UFC4-023-03的倒塌准则,对结构的失效模式进行评价,提出了三种失效模式,即结构轻微损伤、结构局部损伤和结构整体失效。随后,基于冲击破坏杆件数和杆件内力损伤程度,提出了结构整体损伤指数的概念,通过参数分析,探索了索穹顶结构在不同冲击物参数下整体损伤指数的变化特点及不同设计参数下的抗冲击性能。研究发现了整体损伤指数与三种失效模式之间的关系:当失效模式为结构轻微损伤时,其整体损伤指数小于0.3;当失效模式为结构局部损伤时,其整体损伤指数位于0.3~0.8之间;当失效模式为结构整体失效时,其整体损伤指数大于0.8。基于此提出了失效模式控制方程。冲击荷载越靠近结构中心,结构发生整体失效概率越大,反之则局部损伤和轻微损伤概率越大。提高初始预应力水平和杆件截面面积能有效提高结构的抗冲击性能。In line with the review of related studies and aiming at lack of literature on the dynamic response and failure mechanism of cable dome structures under impact load,based on ANSYS/LS-DYNA analysis software,an impact dynamic analysis model for Geiger cable dome structures was proposed.The displacement response and internal force response of an examplic typical Geiger cable dome structure were analyzed in detail,and the failure mode of the structure was further evaluated in conjunction with the collapse criteria in the American standard UFC4-023-03.Three typical failure modes were proposed,namely,minor structural damage,partial structural damage,and overall structural failure.Then,based on the number of impact damage members and the degree of internal force damage of the members,the concept of overall damage index of structures was proposed.Through parameter analysis,the variation characteristics of the overall damage index of cable dome structures under different impact parameters were explored.The study shows the relationship between the overall damage index and three failure modes.When the failure mode is minor structural damage,the overall damage index is less than 0.3.When the failure mode is partial structural damage,the overall damage index is between 0.3 and 0.8.When the failure mode is overall structural failure,the overall damage index is greater than 0.8.According to the above observation,a failure mode control equation was established.The closer the impact load is applied to the center of the structure,the greater the probability of overall failure.Conversely,the greater the probability of partial or minor damage.Increasing the initial prestress level and the cross-sectional area of the members can effectively improve the impact resistance of the structure.

关 键 词：索穹顶结构 冲击荷载 失效模式 动力响应 参数分析 

分 类 号：TU35[建筑科学—结构工程]