Reliability design for bearing capacity of steel plate strengthened RC beams based on the improved design value method

IF 3 3区工程技术 Q2 CONSTRUCTION & BUILDING TECHNOLOGY Structural Concrete Pub Date : 2024-07-22 DOI:10.1002/suco.202400311

Yuting Tong, Jitao Yao, Luyang Zhang

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Abstract

The partial factor method is widely employed as a design approach for structural reliability and serves as a crucial foundation for structural design codes. However, in practical applications, this method has gradually revealed shortcomings, such as issues with generality and insufficient precision in reliability control. In this article, an improved design value method for the bearing capacity design of steel plate strengthened RC beams was established. Additionally, considering the impact of the live‐to‐dead load effect ratio on the partial safety factor of resistance, a simplified expression for the ultimate limit state design of bearing capacity was proposed. The results show that the reliability index calculated using the partial factor method for the bearing capacity of steel plate strengthened RC beams has a significantly larger relative error. In contrast, the reliability indexes calculated based on the improved design value method are all greater than the target reliability index, ensuring the requirements of reliability design and providing a higher degree of precision in reliability control.

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基于改进设计值法的钢板加固 RC 梁承载力可靠性设计

局部因素法作为一种结构可靠性设计方法被广泛采用，是结构设计规范的重要基础。然而，在实际应用中，该方法逐渐暴露出一些缺点，如通用性问题、可靠性控制精度不足等。本文建立了钢板加固 RC 梁承载力设计的改进设计值方法。此外，考虑到活死载效应比对部分抗力安全系数的影响，提出了承载力极限状态设计的简化表达式。结果表明，采用部分系数法计算的钢板加固 RC 梁承载力可靠性指数的相对误差明显较大。相比之下，基于改进设计值法计算的可靠度指数均大于目标可靠度指数，保证了可靠度设计的要求，提供了更高精度的可靠度控制。

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 Concrete CONSTRUCTION & BUILDING TECHNOLOGY-ENGINEERING, CIVIL

CiteScore

5.60

自引率

15.60%

发文量

284

审稿时长

3 months

期刊介绍： Structural Concrete, the official journal of the fib, provides conceptual and procedural guidance in the field of concrete construction, and features peer-reviewed papers, keynote research and industry news covering all aspects of the design, construction, performance in service and demolition of concrete structures. Main topics: design, construction, performance in service, conservation (assessment, maintenance, strengthening) and demolition of concrete structures research about the behaviour of concrete structures development of design methods fib Model Code sustainability of concrete structures.