Steel-Concrete Bond versus Primary Crack Opening in Reinforced Concrete Beams

IF 16.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Accounts of Chemical Research Pub Date : 2024-07-23 DOI:10.1007/s12205-024-1566-6

Jianming Wang, Jian Guo, Chunyu Fu

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Abstract

Bond deterioration between steel bars and concrete in reinforced-concrete beams mostly occurs close to the primary (i.e., bending induced) cracks. To investigate bond-cracking interaction, a novel bond-slip relationship is introduced in this study, where bond parameters are a function of crack-opening displacement. Such a displacement is in turn evaluated based on the highly variable strain profiles in the concrete, through an iterative procedure. The effectiveness of the proposed approach is validated against a set of tests on RC beams well-documented in the literature, which show a clear trend for the local bond stresses to decrease close to the primary cracks. The bond-slip relationships along the bar and the maximum bond stress depend on the applied loads and on the crack pattern, with a mutual interaction that affects both the crack-opening displacement and the bond stresses, causing a nonlinear increase in the steel strains. Nevertheless, the bond-slip relationships display descending branches characterized by remarkably similar slopes within a given region, irrespective of the loads. Consequently, if the descending branch for this region is known under a particular load, the branches under other loads can be obtained by horizontally translating the known branch. The proposed approach may provide a useful tool to describe bond behavior in RC members and to understand the complex interaction among the displacements due to crack opening, bond stresses and their structural effect.

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钢筋混凝土梁中的钢-混凝土粘结力与原裂缝开度

钢筋混凝土梁中钢筋与混凝土之间的粘结劣化大多发生在主裂缝（即弯曲引起的裂缝）附近。为研究粘结-开裂相互作用，本研究引入了一种新的粘结-滑移关系，其中粘结参数是开裂位移的函数。这种位移又是通过迭代程序，根据混凝土中高度可变的应变曲线进行评估的。文献中对 RC 梁进行了大量测试，验证了所建议方法的有效性，测试结果表明，靠近主裂缝的局部粘结应力有明显的下降趋势。沿钢筋的粘结滑移关系和最大粘结应力取决于所施加的荷载和裂缝形态，两者相互影响，既影响开裂位移，也影响粘结应力，从而导致钢筋应变的非线性增加。尽管如此，无论荷载如何，粘结-滑移关系在给定区域内都显示出明显相似斜率的下降分支。因此，如果已知该区域在特定载荷下的下降支线，则可以通过水平平移已知支线来获得其他载荷下的支线。所提出的方法可为描述 RC 构件的粘结行为提供有用的工具，并帮助理解裂缝开裂导致的位移、粘结应力及其结构效应之间复杂的相互作用。

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

Accounts of Chemical Research 化学-化学综合

CiteScore

31.40

自引率

1.10%

发文量

312

审稿时长

2 months

期刊介绍： Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.