Flexural Performance of Steel Fiber Magnesium Phosphate Cement Concrete Beams

被引：0
|
作者：
Wu F.-W. [1 ]
Liu Y.-F. [1 ]
He L.-Q. [1 ]
Cheng W.-H. [1 ]
Li Z.-R. [1 ]
Yang F. [2 ]
机构：
[1] School of Highway, Chang'an University, Shaanxi, Xi'an
[2] School of Civil Engineering, Chang'an University, Shaanxi, Xi'an
来源：
Zhongguo Gonglu Xuebao/China Journal of Highway and Transport | 2023年 / 36卷 / 09期
基金：
中国国家自然科学基金;
关键词：
bridge engineering; calculation of flexural capacity; finite element; flexural performance; steel fiber magnesium phosphate cement concrete beam; test study;
D O I：
10.19721/j.cnki.1001-7372.2023.09.009
中图分类号：
学科分类号：
摘要：
Magnesium phosphate cement concrete can be applied to the flexural members of emergency bridge construction projects. To study the flexural performance of magnesium phosphate cement concrete beams with steel fiber reinforced, four-point flexural tests were conducted on five magnesium phosphate cement concrete beams with different steel fiber contents (0%, 0. 5%, 1. 0%, 1. 5%, and 2. 0%). The effects of the steel fiber content on the failure form, crack distribution, flexural capacity, and ductility of magnesium phosphate cement concrete beams were analyzed. The test results showed that the failure mode of the test beams was a typical flexural failure. Under the same load, the number of cracks in the test beam mixed with steel fibers was more, but the widths of the cracks were smaller and the distribution was denser, thus the cracking condition of the beam body was improved. With an increase in the steel fiber content, the cracking load, yield load, peak load, and ductility coefficient of the test beam increase, particularly the ductility coefficient. Based on ABAQUS finite-element analysis, the test results were compared, and a finite-element parameterized analysis was conducted with the steel fiber content and ratio of longitudinal reinforcement as parameters. The results showed that increasing the ratio of longitudinal reinforcement could significantly improve the flexural capacity of the magnesium phosphate cement concrete beam but reduced the ductility of the beam, whereas increasing the steel fiber content could significantly improve the ductility of the beam. Finally, by exploring the action mechanism of steel fibers in concrete, the tensile strength contributed by steel fibers in the direction of the load was determined, and a formula for calculating the flexural capacity of steel fiber magnesium phosphate cement concrete beams was established. The calculated results agreed well with the experimental results. © 2023 Xi'an Highway University. All rights reserved.
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页码：106 / 118
页数：12
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