Experimental and Theoretical Study on Shear Stiffness of Angle Shear Connectors

被引：0
|
作者：
Qiu S.-Y. [1 ,2 ]
Fan J.-S. [1 ,2 ]
Nie J.-G. [1 ,2 ]
Tang L. [3 ]
Song S.-Y. [4 ]
Xu G.-P. [3 ]
机构：
[1] Key Laboratory of Structural Engineering and Vibration of China Education Ministry, Tsinghua University, Beijing
[2] Beijing Engineering Research Center of Steel and Concrete Composite Structures, Tsinghua University, Beijing
[3] CCCC Highway Consultants Co. Ltd., Beijing
[4] Guangdong Highway Design Institute Co. Ltd., Guangzhou
来源：
Zhongguo Gonglu Xuebao/China Journal of Highway and Transport | 2021年 / 34卷 / 03期
关键词：
Angle shear connector; Bridge engineering; Curvature distribution; Foundation beam model; Push-out tests; Shear stiffness;
D O I：
10.19721/j.cnki.1001-7372.2021.03.009
中图分类号：
学科分类号：
摘要：
Angle shear connectors have garnered more applications in bridge and tunnel structures owing to their high shear strength, excellent fatigue performance, and convenient construction. Currently, angle shear connectors are mainly applied in immersed tunnels, and most studies related to angle shear connectors are mainly carried out in Japan. Existing research mainly focused on the shear strength of angle shear connectors and ignored their shear stiffness, whereas the shear stiffness will influence the interface slip, concrete crack, and the stiffness of structure members. To study the shear stiffness of angle shear connectors, 6 groups of full-size push-out specimens were designed based on practical engineering and standard provisions in China, including 3 sizes of angle steel and 2 grades of concrete. To reduce discreteness, three duplicate specimens are present in each group. All specimens failed in the concrete crush mode of the experiment, and the shear strength and shear stiffness increase as the concrete strength increases. When using the same grade concrete, the shear performance of specimens with 3 sizes of angle shear connectors is similar. According to the curvature distribution data, the web of angle steel burdens larger moments and shear forces at the bottom while the flange burdens small moments, which indicates the small contribution of flange to resisting shear force. Based on the existing theoretical models and experimental data of angle shear connectors, the foundation beam model of angle steel was proposed via theoretical analysis. This model was verified based on 10 groups of shear-slip curves and 12 groups of curvature data and its results reveal the accuracy of the proposed model. Because the formula used in the proposed model was too complex, the formula of the shear stiffness was simplified according to the practical construction. The simplified formula was verified based on 10 groups of shear-slip curves; the results reveal the excellent accuracy of the simplified formula. © 2021, Editorial Department of China Journal of Highway and Transport. All right reserved.
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页码：136 / 146
页数：10
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