不同空心率的方形聚丙烯纤维轻骨料混凝土空心柱的轴压性能

doi:10.11896/cldb.20080291

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Abstract In order to study the effect of different hollow ratios on the axial compression performance of high performance polypropylene fiber reinforced lightweight aggregate concrete square hollow columns, 7 groups (14) of axial compression column tests were carried out and four reinforced concrete columns were performed numerical simulations by using finite element numerical simulation software ABAQUS. The results showed that as the hollow rate increased, the number of cracks on the concrete surface of the specimen increased, and the peak load decreased; most of the unreinforced hollow columns were two vertical main cracks penetrating from top to bottom concentrated near the square holes. The concrete da-mage was serious and the elastic stiffness was significantly reduced; however, most of the reinforced hollow columns had a diagonal main crack with small crack width, and the concrete had good integrity; the ductility of hollow columns increased first and then decreased and when the hollow rate was 9%, the ductility coefficient of the hollow column obtained the maximum value. Generally speaking, the ductility of hollow columns was better than that of solid columns. The finite element simulation results showed that the concrete began to fail and the longitudinal bars yielded in the elastoplastic stage, and the concrete was seriously damaged in the descending section.

Key words： hollow rate square hole lightweight aggregate axial compression performance

Published: 25 November 2021 Online: 2021-12-13

CLC number:	TU528.2
	TU375.3

Fund:National Natural Science Foundation of China (51968058), the Natural Science Foundation of Inner Mongolia Autonomous Region (2020BS05020,2021MS05058), the Higher Education Science and Technology Research Project of Inner Mongolia Autonomous Region (NJZY20097), the Innovation Fund of Inner Mongolia Science and Technology University (2019QDL-B50), the Climbing Plan of Inner Mongolia Science and Technology University (XZ-TJ-01), Open Fund Project of Institute of Building Science, Inner Mongolia University of Science and Technology (JYSJJ-2021Q04).

About author: Jingjun Lireceived his Ph.D. degree in Engineering from Chongqing University in 2018. He is currently a lecturer in Inner Mongolia University of Science and Technology. He is engaged in scientific research and technical development of high performance cement-based materials.
Jiangang Niureceived his Ph.D. degree in Enginee-ring from Xi'an University of Architecture and Technology in 2008. He is currently a professor in Inner Mongolia University of Science and Technology. He is engaged in scientific research concrete durability.

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Cite this article:

LI Jingjun,LIU Weiheng,NIU Jiangang, et al. Axial Compression Properties of Square Polypropylene Fiber Lightweight Aggregate Concrete Hollow Columns with Different Hollow Rates[J]. Materials Reports, 2021, 35(22): 22057-22062.

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http://www.mater-rep.com/EN/10.11896/cldb.20080291 OR http://www.mater-rep.com/EN/Y2021/V35/I22/22057

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