Interface shear behavior of stud shear connectors composite plate with constrained measure

被引：0
|
作者：
Qi J. [1 ]
Wu J. [1 ]
Jiang L. [2 ]
Cao H. [3 ]
Xie Z. [1 ]
Lü W. [1 ]
Huang Z. [1 ]
机构：
[1] School of Civil Engineering, Hunan University of Science and Technology, Xiangtan
[2] School of Civil Engineering, Central South University, Changsha
[3] Hunan Architectural Design Institute Limited Company, Changsha
来源：
Journal of Railway Science and Engineering | 2023年 / 20卷 / 07期
关键词：
Interfacial shear behavior; Mechanical performance; Shear stiffness; Stud connector;
D O I：
10.19713/j.cnki.43-1423/u.T20221461
中图分类号：
学科分类号：
摘要：
The problem of concrete cracking of composite beam during application will decrease of the member stiffness and bearing capacity, and become one of the important reasons restricting the development and application of composite structure. In order to solve the problem of concrete slab in negative bending moment zone of composite structure, a composite platec measure based on stud connector with constraint was proposed. By adding an additional steel plates to the concrete flange plate in the negative bending moment area of the composite beam, the additional steel plates and steel beams were welded with stud connectors with constraint structures respectively. The two were interlocked and staggered on both sides of the concrete plate. The feasibility of using additional steel plates to help concrete tensile in negative bending moment region and the effectiveness of this composite plate measure to prevent concrete slabs from opening crack were verified by double interface shear test. The interfacial shear performance of stud connector with constraint structure were studied. The results show that the stud connector with constraint structure can restrain the cracks within the range of 6 times the diameter of the stud, avoid longitudinal penetrating cracks of concrete slab, and give full play to the advantages of high compressive strength of concrete material. The constraint structure can effectively improve the shear stiffness of the stud. It is proved that it is feasible to use additional steel plate to replace the concrete plate and the tensile steel bar in the negative moment zone, and the stud connector with constraint structure can reduce the amount of transverse steel bar. A formula for calculating shear stiffness of stud connectors with constraint structures is proposed, and a shear stiffness ratio-shear angle curve is proposed to evaluate material utilization efficiency and shear efficiency of stud connectors with different length-diameter ratios. It is suggested that the maximum elastic shear stiffness of stud connector with constraint structure. It lays a good experimental and theoretical foundation for the engineering application of this kind of shear connector. © 2023, Central South University Press. All rights reserved.
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页码：2629 / 2642
页数：13
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