索桁架结构施工误差评估的孪生仿真与模型试验  

Twinning simulation and model test for construction error assessment of cable truss structures

作　　者：史国梁 刘占省[1,2] 路德春 黄春[1,2] 及炜煜 王泽强 HI Guoliang;LIU Zhansheng;LU Dechun;HUANG Chun;JI Weiyu;WANG Zeqiang(College of Architecture and Civil Engineering,Beijing University of Technology,Beijing 100124,China;The Key Laboratory of Urban Security and Disaster Engineering of Ministry of Education,Beijing University of Technology,Beijing 100124,China;Beijing Building Construction Research Institute Co.,Ltd.,Beijing 100039,China)

机构地区：[1]北京工业大学城市建设学部,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]北京市建筑工程研究院有限责任公司,北京100039

出　　处：《建筑结构学报》2024年第4期107-119,共13页Journal of Building Structures

基　　金：国家自然科学基金项目(52178095)。

摘　　要：索结构施工复杂,施工误差具有很强的随机性,严重影响结构的安全状态。而已有的施工误差对结构力学性能影响的研究,存在模型不统一、精度及效率不足等问题。为此,针对索桁架结构进行了施工误差评估的孪生仿真与模型试验,建立了索桁架结构参数化模型和施工误差空间模型,并获取了影响因素与结构受力性能间的非线性映射关系。在所提施工误差评估方法的基础上进行了四个基本输入参数的参数化分析,得到了不同类型施工误差耦合作用下结构受力性能的变化规律。并以带刚性环的索桁架结构为例,开发了数字孪生仿真平台,进一步验证了评估方法的有效性。研究结果表明:基于数字孪生的数据映射关系可以有效获取施工误差下的受力性能;通过评估方法获取的试验模型力学性能与试验值高度吻合,验证了该方法的可行性;减小径向索尺寸和增加拉索成形态索力是降低施工误差影响的有效措施;为满足索力误差不超出±10%的要求,制定了施工误差的控制指标,在满足结构自身成形态应力的要求下,应控制最不利组合工况下长度误差在索长的1/350以内。The construction process of cable structures is complicated,and the construction errors are highly unpredictable,which has a negative impact on the structural safety.Existing research of the influence of construction error on structural mechanical performance has issues such as a lack of consistency in the model,insufficient accuracy and efficiency.Therefore,twinning simulation and model test of construction error assessment for cable truss structure were carried out.Parametric model and construction error space model of cable truss were developed,and the nonlinear mapping relationship between influencing factors and structural mechanical properties was obtained.Driven by the proposed construction error assessment method,parametric analysis considering four basic input parameters was conducted,and the change law of structural stress performance under the coupling of different types of construction errors was derived.Using the cable truss structure with rigid ring as an example,a digital twin simulation platform was developed to assess the effectiveness of the evaluation method further.The results show that the data mapping relationship based on digital twins can effectively obtain the mechanical property under the influence of construction error.The mechanical property of the test model obtained by the evaluation method is highly consistent with the test values,confirming the feasibility of the method.Based on the parametric analysis of twin simulation platform,reducing the radial cable size and increasing the cable force are effective measures to reduce the influence of construction error.To meet the requirement that the cable force error must not exceed ±10%,a construction error control index was formulated.In order to meet the self-forming stress of the structure,the length error under the most unfavorable combined working condition should be controlled within 1/350 of the cable length.

关 键 词：索桁架结构 数字孪生 施工误差 受力性能 智能评估 

分 类 号：TU745[建筑科学—建筑技术科学] TU311.41