索桁架结构冲击力学响应及破坏模式分析方法

IF 5.7 1区工程技术 Q1 ENGINEERING, CIVIL

Thin-Walled Structures Pub Date : 2025-05-10 DOI:10.1016/j.tws.2025.113438

Guoliang Shi , Zhansheng Liu , Dechun Lu , Xiuli Du , Qingwen Zhang

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引用次数: 0

摘要

如何连续、动态地分析冲击荷载对结构的影响，并给出合理的维护措施，已成为大型索结构健康监测的关键。本研究以索桁架结构为研究对象。提出了一种冲击力学响应和失效模式分析方法。首先，根据索桁架结构的实验模型，设计了冲击载荷工况和力学响应采集机构。以实测参数作为评价模型仿真精度的指标。建立了结构仿真模型，得到了不同冲击荷载作用下的力学响应。提出了结构破坏模式的评价方法和结构整体损伤指数的概念。通过建立破坏模式与损伤指标的对应关系，形成结构破坏模式的控制方程。为了给出有效的措施来维护结构的安全，对结构的关键参数进行了分析。考虑到冲击载荷的随机性，提出了一种基于IPSO优化的CNN-BiLSTM力学响应预测方法。结合有限元模拟数据样本和预测方法，建立了冲击载荷状态与结构整体损伤指标之间的映射关系。研究结果表明，所建立的仿真模型和计算方法的精度为95%，有效地获得了结构破坏模式的性能规律。改进的深度学习预测模型实现了结构力学响应的连续动态分析，分析误差和时间成本分别降低了10.3%和25.3%。

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Analysis method for impact mechanical response and failure mode of cable truss structure

How to continuously and dynamically analyze the influence of impact load on the structure and give reasonable maintenance measures has become the key to health monitoring of large cable structures. In this study, a cable truss structure is taken as the research object. An analysis method of impact mechanical response and failure mode is proposed. Firstly, according to the experimental model of a cable truss structure, the impact load condition and mechanical response acquisition mechanism are designed. The measured parameters are used as indicators to evaluate the simulation accuracy of the model. A structural simulation model is established to obtain the mechanical response under various impact loads. The evaluation method of structural failure mode and the concept of structural overall damage index are proposed. By establishing the corresponding relationship between the failure mode and the damage index, the control equation of the structural failure mode is formed. In order to give effective measures to maintain the safety of the structure, the key parameters of the structure are analyzed. Considering the randomness of impact load, a mechanical response prediction method based on CNN-BiLSTM optimized by IPSO is proposed. Combined with the finite element simulation data samples and prediction methods, the mapping relationship between the impact load condition and the overall damage index of the structure is established. The research results show that the accuracy of the established simulation model and calculation method is >95 %, and the performance law of the structural failure mode is effectively obtained. The improved deep learning prediction model realizes the continuous dynamic analysis of structural mechanical response, and the analysis error and time cost are reduced by 10.3 % and 25.3 % respectively.

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来源期刊

Thin-Walled Structures 工程技术-工程：土木

CiteScore

9.60

自引率

20.30%

发文量

801

审稿时长

66 days

期刊介绍： Thin-walled structures comprises an important and growing proportion of engineering construction with areas of application becoming increasingly diverse, ranging from aircraft, bridges, ships and oil rigs to storage vessels, industrial buildings and warehouses. Many factors, including cost and weight economy, new materials and processes and the growth of powerful methods of analysis have contributed to this growth, and led to the need for a journal which concentrates specifically on structures in which problems arise due to the thinness of the walls. This field includes cold– formed sections, plate and shell structures, reinforced plastics structures and aluminium structures, and is of importance in many branches of engineering. The primary criterion for consideration of papers in Thin–Walled Structures is that they must be concerned with thin–walled structures or the basic problems inherent in thin–walled structures. Provided this criterion is satisfied no restriction is placed on the type of construction, material or field of application. Papers on theory, experiment, design, etc., are published and it is expected that many papers will contain aspects of all three.