火灾对钢筋混凝土配筋深梁结构性能的实验与理论影响

IF 16.4 1区 化学 Q1 CHEMISTRY, MULTIDISCIPLINARY
Abbas Kareem, Shatha D. Mohammed
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引用次数: 1

摘要

带状钢筋混凝土(LRC)结构单元包括连续倾斜的剪切钢筋,其形式是连接结构单元两面的纵向钢筋。本研究对LRC深梁进行了理论研究,以预测其在火灾和高温下的行为。考虑长度为1500mm、宽度为200mm、深度为240mm的四根简支钢筋混凝土梁。试件在抗压强度(40 MPa)和钢筋细部方面相同。钢筋配筋率为0.0035。三个样品在不同的持续时间和稳态温度下燃烧(在500℃和600℃下燃烧1小时,在500℃下燃烧2小时)。采用ABAQUS软件对深简支梁在中三分之一处受两个同心荷载作用下的抗弯性能进行了研究。结果表明,倾角为45˚的加筋改善了深梁的结构性能,抗破坏,延长了模型的使用寿命。试件的结构响应达到最优。加筋改善了破坏模式,使其由剪切破坏转变为弯剪破坏。参数化研究表明,加筋能显著提高深梁的强度,且不受稳态温度和持续时间的影响。此外,与参考LRC深梁相比,承载能力的更大增加与弯曲直径约12和16 mm分别增加约24.77%和87.61%有关。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
The Experimental and Theoretical Effect of Fire on the Structural Behavior of Laced Reinforced Concrete Deep Beams
A Laced Reinforced Concrete (LRC) structural element comprises continuously inclined shear reinforcement in the form of lacing that connects the longitudinal reinforcements on both faces of the structural element. This study conducted a theoretical investigation of LRC deep beams to predict their behavior after exposure to fire and high temperatures. Four simply supported reinforced concrete beams of 1500 mm, 200 mm, and 240 mm length, width, and depth, respectively, were considered. The specimens were identical in terms of compressive strength ( 40 MPa) and steel reinforcement details. The same laced steel reinforcement ratio of 0.0035 was used. Three specimens were burned at variable durations and steady-state temperatures (one hour at 500 °C and 600 °C, and two hours at 500 °C). The flexural behavior of the simply supported deep beams, subjected to the two concentric loads in the middle third of the beam, was investigated with ABAQUS software. The results showed that the laced reinforcement with an inclination of 45˚ improved the structural behavior of the deep beams, and the lacing resisted failure and extended the life of the model. The optimal structural response was observed for the specimens. The laced reinforcement improved the failure mode and converted it from shear to flexure-shear failure. The parametric study showed that the lacing bars remarkably improved the strength of the deep beams and they were not affected more by the steady-state temperature and duration. Furthermore, a greater increase in load-carrying capacity was associated with an increase in the flexural diameter of approximately 12 and 16 mm by approximately 24.77% and 87.61%, respectively, compared to the reference LRC deep beams.
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来源期刊
Accounts of Chemical Research
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.
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