Stability reliability analysis of kiewitt single-layer gridshells with experimentally validated topology-constrained initial imperfections

IF 6.6 1区工程技术 Q1 ENGINEERING, CIVIL

Thin-Walled Structures Pub Date : 2026-05-01 Epub Date: 2026-02-12 DOI:10.1016/j.tws.2026.114669

Chenyu Wu , Shouchao Jiang , Qiang Zeng , Shaojun Zhu

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引用次数: 0

Abstract

This study provides a comprehensive stability reliability analysis of the Kiewitt single-layer gridshell (SLG) under actual topology-constrained initial imperfection fields proposed by the constrained stochastic imperfection modal method (CSIMM). A measurement experiment of scaled SLG is carried out, and the consistency between the measured and simulation results further validates the rationality of the CSIMM. Based on the validated imperfection field simulation theory, the influence of key parameters variability on the probability distribution of nonlinear buckling capacity (NBC) for imperfect SLGs is revealed, among which the load condition variability significantly influences the probability distribution of NBC, whereas the effect of material properties variability remains minimal. Subsequently, NBC probability distributions of 24 typical perfect Kiewitt SLGs with consideration of key parameters variability are obtained for probability reliability analysis, on which basis the reliability significance of NBC derived from the prevalent eigenmode imperfection method (EIM) is clarified, indicating that the EIM fails to ensure sufficient safety margins under actual imperfection fields. Meanwhile, several recommendations for current specification revision are offered: the imperfection amplitude is suggested to be adjusted to 1/1500 of structural span; for designer acceptable assurance rates of 99% and 95%, the safety factors are advised to be 1.44 and 1.30, respectively. As a result of reliability analysis, a novel calculation method of NBC for imperfect SLGs with topology-constrained imperfection fields is proposed, which comprises a benchmark method using Monte Carlo simulation and a simplified method according to the modified specification.

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具有实验验证的拓扑约束初始缺陷的kiewitt单层网格壳稳定性可靠性分析

本文采用约束随机缺陷模态法（CSIMM）对实际拓扑约束初始缺陷场下的Kiewitt单层网格壳（SLG）进行了全面的稳定性可靠度分析。进行了缩放SLG的测量实验，测量结果与仿真结果的一致性进一步验证了CSIMM的合理性。基于已验证的缺陷场模拟理论，揭示了关键参数变异性对不完善slg非线性屈曲能力概率分布的影响，其中载荷条件变异性对非线性屈曲能力概率分布的影响显著，而材料性能变异性的影响较小。随后，获得了考虑关键参数变异性的24个典型完美Kiewitt slg的NBC概率分布，进行了概率可靠性分析，在此基础上，阐明了由流行特征模态缺陷法（EIM）推导出的NBC的可靠性意义，表明EIM在实际缺陷场下不能保证足够的安全裕度。同时，对现行规范的修订提出了几点建议：建议将缺陷幅值调整为结构跨度的1/1500；对于99%和95%的设计者可接受保证率，建议安全系数分别为1.44和1.30。在可靠性分析的基础上，提出了一种具有拓扑约束缺陷域的不完善slg的NBC计算方法，该方法包括蒙特卡罗模拟基准法和改进规范简化法。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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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.