Mechanical properties of axially and eccentrically loaded CFRP-coral concrete columns

IF 1.2 4区工程技术 Q3 CONSTRUCTION & BUILDING TECHNOLOGY

Proceedings of the Institution of Civil Engineers-Structures and Buildings Pub Date : 2023-01-16 DOI:10.1680/jstbu.22.00134

Shuang Chen, Jiwen Guan, Shujia Liang

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Abstract

The eccentrically loaded bearing capacity tests on 6 CFRP reinforced coral concrete short columns were carried out. Parameters such as the ultimate bearing capacities, the stress of CFRP bars and surface concrete were measured and analyzed. The results showed that all the columns failed due to the crushing of concrete in the compression zone. Meanwhile, the increase of eccentricity not only decreased the ultimate bearing capacity, but also resulted in the shear fracture of CFRP longitudinal bars in compression zone. In general, the stress of longitudinal CFRP reinforcements in all specimens were always in quite low level. The maximum stress of CFRP bars in columns was just 105.78 MPa, only 23.5% of the ultimate compressive strength of CFRP reinforcement. The superior bonding performance between the CFRP bars and coral concrete conformed to the deformation coordination. Subsequently, the calculation method for bearing capacity of CFRP-coral concrete short columns was put forward, and the calculated results agreed well with the tested results.

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轴向和偏心加载cfrp -珊瑚混凝土柱的力学性能

对6根CFRP增强珊瑚混凝土短柱进行了偏心承载力试验。对CFRP筋和表面混凝土的极限承载力、应力等参数进行了测试和分析。结果表明，所有柱均因受压区混凝土破碎而失效。同时，偏心距的增大不仅降低了CFRP纵筋的极限承载力，而且导致了受压区CFRP纵筋的剪切断裂。总体而言，各试件的纵向CFRP筋应力一直处于较低水平。柱中CFRP筋的最大应力仅为105.78 MPa，仅为CFRP筋极限抗压强度的23.5%。CFRP筋与珊瑚混凝土具有良好的粘结性能，符合变形协调。随后，提出了cfrp -珊瑚混凝土短柱承载力计算方法，计算结果与试验结果吻合较好。

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

Proceedings of the Institution of Civil Engineers-Structures and Buildings 工程技术-工程：土木

CiteScore

3.40

自引率

6.20%

发文量

审稿时长

12 months

期刊介绍： Structures and Buildings publishes peer-reviewed papers on the design and construction of civil engineering structures and the applied research associated with such activities. Topics include the design, strength, durability and behaviour of structural components and systems. Topics covered: energy conservation, people movement within and around buildings, strength and durability of steel and concrete structural components, and the behaviour of building and bridge components and systems