Flexural Capacity of UHPC Reinforced Ordinary Concrete Composite Beam

被引：2

作者：

Luo M. ^{[1
]}

Lin P. ^{[1
]}

Yang Z. ^{[1
]}

机构：

[1] School of Civil Engineering, Lanzhou Jiaotong University, Lanzhou

来源：

Zhongguo Tiedao Kexue/China Railway Science | 2021年 / 42卷 / 05期

关键词：

Composite beam; Experiment; Flexural capacity; Strain; UHPC height; Ultra-high performance concrete;

D O I：

10.3969/j.issn.1001-4632.2021.05.03

中图分类号：

学科分类号：

摘要：

The flexural capacity of Ultra-High Performance Concrete (UHPC) reinforced ordinary concrete composite beams was experimentally studied, and the calculation formula for the flexural capacity of composite beams was proposed based on meso-mechanics theory. The results show that there is a good linear relationship between the cross-section strain and the section height of the composite beam in the loading process, and the composite beam satisfies the flat section assumption. The flexural failure of composite beams includes three stages: elastic stage, crack stage and failure stage. With the increase of UHPC height, the time from crack appearance to the failure of the composite beam increases obviously, and the cracks in the beam body increase and grow significantly, showing a state of multi-slit cracking. The failure mode tends to plastic failure. The flexural capacity of composite beams increases with the increase of UHPC height. When the UHPC height exceeds half of the section height, the increase rate of the composite beam flexural capacity slows down and remains constant. The calculation formula for the flexural capacity of composite beams considers the UHPC height, fiber ratio, fiber length and flexural compressive strength, which has a high calculation accuracy. © 2021, Editorial Department of China Railway Science. All right reserved.

引用

页码：21 / 29

页数：8

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