Eurocode-compliant system-level reliability analyses of trussed portal frames under climatic loads

IF 5.7 1区工程技术 Q1 ENGINEERING, CIVIL

Structural Safety Pub Date : 2024-02-20 DOI:10.1016/j.strusafe.2024.102451

Lauri Jaamala , Henna Hietikko-Kaukola , Kristo Mela , Juha Tulonen , Anssi Hyvärinen

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Abstract

Eurocode 3 provides Geometrically and Materially Nonlinear Analysis with Imperfections-method (GMNIA) in which the entire structure can be designed in system-level. In GMNIA, reliability of structural system is verified by using a system safety factor which is obtained in Eurocode 3 based on numerical or experimental capacity test results. Unfortunately, such test results are scarcely published in the literature thus complicating the determination of the factor for a design engineer. In the so-called Direct Design Method, however, system safety factors are provided in advance for the design engineer by system-level reliability studies. This study determines the Eurocode-compliant GMNIA system safety factor for Warren truss portal frames by using the approach of the Direct Design Method. Advanced numerical models are utilized to perform Monte Carlo-simulations for entire structural systems. These simulations provide statistical distributions of system resistances which are employed in the First-Order Reliability Method to derive the system safety factors. Studied structures are made of S700 cold-formed hollow sections. Various system geometries, system configurations and load combinations consisting of snow and wind loads are investigated and a suitable system safety factor is proposed for the ultimate limit state design of Warren truss portal frames. The proposed system safety factor is applied in a practical comparison in which Warren system is designed both by the conventional Eurocode 3 method and GMNIA. This comparison reveals that GMNIA has a remarkable potential to offer reduced material consumption in design compared to the conventional method.

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符合欧洲规范的气候荷载下桁架式门式框架系统级可靠性分析

欧洲规范 3 提供了带缺陷的几何和材料非线性分析方法 (GMNIA)，可在系统级对整个结构进行设计。在 GMNIA 中，结构系统的可靠性是通过使用系统安全系数来验证的，而系统安全系数是 Eurocode 3 根据数值或实验承载力测试结果得出的。遗憾的是，此类测试结果很少在文献中公布，因此使设计工程师确定安全系数的工作变得更加复杂。然而，在所谓的直接设计法中，系统安全系数是通过系统级可靠性研究提前提供给设计工程师的。本研究采用直接设计法确定沃伦桁架门式框架符合欧洲规范的 GMNIA 系统安全系数。利用先进的数值模型对整个结构系统进行蒙特卡罗模拟。这些模拟提供了系统阻力的统计分布，并通过一阶可靠性方法得出系统安全系数。所研究的结构由 S700 冷弯空心型钢制成。研究了各种系统几何形状、系统配置以及由雪荷载和风荷载组成的荷载组合，并为沃伦桁架门式框架的极限状态设计提出了合适的系统安全系数。提出的系统安全系数被应用于实际比较中，其中沃伦系统的设计采用了传统的 Eurocode 3 方法和 GMNIA 方法。比较结果表明，与传统方法相比，GMNIA 在减少设计材料消耗方面具有显著的潜力。

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

Structural Safety 工程技术-工程：土木

CiteScore

11.30

自引率

8.60%

发文量

审稿时长

53 days

期刊介绍： Structural Safety is an international journal devoted to integrated risk assessment for a wide range of constructed facilities such as buildings, bridges, earth structures, offshore facilities, dams, lifelines and nuclear structural systems. Its purpose is to foster communication about risk and reliability among technical disciplines involved in design and construction, and to enhance the use of risk management in the constructed environment