基于数字孪生的索膜结构构件失效机制研究  

Research on Failure Mechanism of Components in Cable-Membrane Structure Based on Digital Twin

作　　者：刘占省[1,2] 史国梁 王泽强 赵一峰[4] 贾玮寒 Liu Zhansheng;Shi Guoliang;Wang Zeqiang;Zhao Yifeng;Jia Weihan(College of Architecture and Civil Engineering,Beijing University of Technology,Beijing 100124,China;Key Laboratory of Urban Security and Disaster Engineering of Ministry of Education,Beijing University of Technology,Beijing 100124,China;School of Civil Engineering,Tianjin University,Tianjin 300072,China;Beijing Building Construction Research Institute Co.,Ltd.,Beijing 100039,China)

机构地区：[1]北京工业大学建筑工程学院,北京100124 [2]北京工业大学城市与工程安全减灾教育部重点实验室,北京100124 [3]天津大学建筑工程学院,天津300072 [4]北京市建筑工程研究院有限责任公司,北京100039

出　　处：《天津大学学报(自然科学与工程技术版)》2025年第4期357-367,共11页Journal of Tianjin University:Science and Technology

基　　金：国家自然科学基金资助项目(52178095);国家土建结构预制装配化工程技术研究中心资助项目(2023CPCCE-K01).

摘　　要：索膜结构在运维过程中容易受到风荷载、温度等外界环境因素的影响,导致节点松动、构件失效进而严重影响了结构的安全性能.如何实现结构服役期安全状态的精准仿真,有效提高结构的抗倒塌性能,同时降低健康监测的成本是实现索膜结构智慧运维所面临的关键问题.本文提出了基于数字孪生的索膜结构构件失效机制分析方法.首先从几何和物理两个层面修正虚拟模型,形成高保真的数字孪生模型的建立方法,从而高效精准地映射结构受力状态.其次,在孪生模型的基础上,给出构件失效前后力学响应的分析流程.在孪生模型中设置构件失效工况,获取结构的力学响应规律.根据失效前后结构力学性能的变化情况,计算构件重要性系数,捕捉关键受力构件.在关键构件失效后分析结构内力分布情况,得到结构倒塌前的传力机理.以长春东收费罩棚索膜结构为研究对象进行方法应用,验证了理论方法的可行性.案例应用结果表明:所建立的孪生模型可以有效仿真结构的受力状态,计算误差在3%以内;通过分析各类构件失效后的结构力学性能得到了力学响应表现规律和关键受力构件;基于关键受力构件失效前后的力学响应,建立了传力机理,获取了内力传递路径,明确了结构健康监测对象.本研究方法为制定结构安全的智慧运维策略和提高结构抗倒塌性能提供了可靠支撑.The cable-membrane structure is easily affected by factors in the external environment such as wind load and temperature during its operation and maintenance process,which leads to the relaxation of joints and the failure of components and thus seriously affects its safety performance.Therefore,how to realize an accurate simulation of its safety state during its service period and effectively improve its collapse resistance performance while reducing the cost of health monitoring is a key problem that the intelligent operation and maintenance of the cable-membrane structure faces.In this paper,a failure mechanism analysis method for the components in a cable-membrane structure based on digital twin was proposed.First,the virtual model was modified at the geometric and physical levels to form a high-fidelity digital twin model,so as to efficiently and accurately map the stress state of the structure.Then,based on the twin model,the analysis process of mechanical response before and after the component failure was given.The component failure condition was set in the twin model to obtain the mechanical response law of the structure.According to the changes in structural mechanical properties before and after the failure,the importance coefficient of components was calculated to capture the key stressed components.After the failure of key components,the internal force distribution in the structure was analyzed,and the force transfer mechanism before the collapse of the structure was obtained.The cable-membrane structure of Changchun East Toll Shed was taken as a research object,and the feasibility of the proposed theoretical method was verified.The application results of the case study show that the established twin model can effectively simulate the stress state of the structure,with a calculation error less than 3%.Through the analysis of the structural mechanical properties after the failure of various components,the mechanical response performance law and key stressed components were obtained.Based on the mechani

关 键 词：索膜结构 数字孪生 构件失效 力学响应 传力机理 

分 类 号：TU393.3[建筑科学—结构工程]