循环荷载下的钢筋混凝土板承载能力分析:双重数值方法

IF 4.4 2区 工程技术 Q1 COMPUTER SCIENCE, INTERDISCIPLINARY APPLICATIONS Computers & Structures Pub Date : 2024-11-16 DOI:10.1016/j.compstruc.2024.107585
Phuc L.H. Ho , Canh V. Le , Dung T. Tran , Phuong H. Nguyen , Jurng-Jae Yee
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引用次数: 0

摘要

振动分析是一种强大而有效的工具,用于计算结构在可变和重复外部准静态荷载作用下的安全系数,可防止结构发生增量和替代塑性坍塌。实际工程应用中的钢筋混凝土板通常处于长期可变和循环荷载下,但其疲劳行为在文献中鲜有报道,尤其是受尼尔森屈服条件制约的疲劳行为。本文基于位移有限元和圆锥程序设计,提出了静态和运动学双重减震公式。由此产生的优化问题具有变量数量庞大的特点,但却能得到有效解决。研究了具有不同几何形状、荷载和边界条件的各种实用 RC 板,精确捕捉了局部塑性耗散能量的坍塌模式,并呈现了疲劳状态下的力矩分布。在具有局部塑性耗散能的区域实施了加固策略,结果表明,在防止增量和替代坍塌模式的同时,此类板的承载能力显著提高。
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Bearing capacity analysis of RC slabs under cyclic loads: Dual numerical approaches
Shakedown analysis is a powerful and efficient tool for calculating the safety factors of structures under variable and repeated external quasi-static loads, that can prevent structures from incremental and alternative plasticity collapses. RC slabs in practical engineering applications are usually under long-tern variable and cyclic loads, but their fatigue behavior was rarely reported in the literature, particularly for those governed by the Nielsen yield condition. In this paper, dual static and kinematic shakedown formulations based on displacement-finite elements and conic programming are developed. The resulting optimization problems, characterized by a huge number of variables, are effectively solved. A wide range of practical RC slabs with diverse geometries, loading and boundary conditions are investigated, precisely capturing the collapse modes in terms localized plastic dissipation energy and presenting moment distribution at fatigue state. Strengthening strategies are performed in regions with localized plastic dissipation energy, showing that the load-bearing capacity of such slabs increases significantly while incremental and alternative collapse modes are prevented.
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来源期刊
Computers & Structures
Computers & Structures 工程技术-工程:土木
CiteScore
8.80
自引率
6.40%
发文量
122
审稿时长
33 days
期刊介绍: Computers & Structures publishes advances in the development and use of computational methods for the solution of problems in engineering and the sciences. The range of appropriate contributions is wide, and includes papers on establishing appropriate mathematical models and their numerical solution in all areas of mechanics. The journal also includes articles that present a substantial review of a field in the topics of the journal.
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