Loading Methods Effect on Behavior of RC Beam-Column Sub-assemblages to Resist Progressive Collapse

IF 16.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Accounts of Chemical Research Pub Date : 2024-09-12 DOI:10.1007/s12205-024-0672-9

Tianqi Xue, Xiaolan Yuan, Zhi Li

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Abstract

This paper investigated the effect of different loading methods on the collapse mechanism of reinforced concrete (RC) structures by conducting tests on two RC beam-column sub-assemblages. Tests employed two loading methods, i.e., concentrated loading (CL) method and uniformly distributed loading (UDL) method. Failure modes and load-displacement curves of the sub-assemblages were obtained by the tests. The results revealed that the specimens subjected to different loading methods exhibited different failure modes. The CL method would over-estimate the deformation capacity of the sub-assemblages. The ultimate displacement of the specimen subjected to CL was 3.5% higher than that subjected to UDL. The ANSYS/LS-DYNA based finite element (FE) analyses were performed to discuss the effects of different initial uniform loads on UDL specimen beams. The FE results indicated that the deformation capacity decreased with the increase of initial uniform loads. A 200% increase in initial uniform load decreased the ultimate displacement by 10.3%. Moreover, comparison of results under single- and multi-point loading demonstrated that the failure modes of specimens were influenced by the number of loading points.

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加载方法对钢筋混凝土梁柱次组合抗渐进式坍塌行为的影响

本文通过对两种钢筋混凝土梁柱分组合进行试验，研究了不同加载方法对钢筋混凝土（RC）结构坍塌机理的影响。试验采用了两种加载方法，即集中加载（CL）法和均匀分布加载（UDL）法。试验得出了次组合件的破坏模式和荷载-位移曲线。结果显示，采用不同加载方法的试样表现出不同的破坏模式。CL 加载法会高估子组件的变形能力。采用 CL 加载法的试样的极限位移比采用 UDL 加载法的试样高出 3.5%。为讨论不同初始均布荷载对 UDL 试样梁的影响，进行了基于 ANSYS/LS-DYNA 的有限元（FE）分析。FE 结果表明，变形能力随着初始均布荷载的增加而降低。初始均布荷载增加 200% 时，极限位移减少了 10.3%。此外，单点和多点加载下的结果对比表明，试样的破坏模式受加载点数量的影响。

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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.