Flexural behavior of steel-UHPC composite slabs with demountable shear connectors

被引：0
|
作者：
Guo J. [1 ]
Wang J. [1 ]
Gao X. [1 ,2 ]
Bian C. [1 ,3 ]
机构：
[1] Key Lab of Advanced Civil Engineering Materials, Tongji University, Ministry of Education, Shanghai
[2] College of Civil Engineering and Architecture, Henan University of Technology, Zhengzhou
[3] Zhejiang Institute of Communications Co. Ltd., Hangzhou
来源：
Harbin Gongye Daxue Xuebao/Journal of Harbin Institute of Technology | 2024年 / 56卷 / 01期
关键词：
demountable shear connectors; flexural behavior; flexural capacity; flexural stiffness; steel - UHPC composite structure; ultra-high performance concrete;
D O I：
10.11918/202206110
中图分类号：
学科分类号：
摘要：
To improve the ductility of steel-ultra-high performance concrete (UHPC) composite structures, we proposed a type of demountable steel-UHPC composite slab based on demountable shear connectors. The flexural tests for demountable steel - UHPC composite slabs with different shear connection degrees were designed and completed. The failure mode, ultimate capacity, stiffness, cracking behavior, and relative slip of demountable steel-UHPC composite slabs were analyzed and compared with those of steel-UHPC composite slabs with welded shear connectors. The demountability of demountable steel-UHPC composite slabs was discussed. The ultimate flexural capacity and flexural stiffness of demountable steel-UHPC composite slabs were theoretically analyzed, and related calculation formulas were deduced. Results showed that the failure mode of demountable steel - UHPC composite slabs was longitudinal horizontal shear bonding failure. Reducing the stud spacing could enhance the cooperative deformation capacity of demountable steel-UHPC composite slabs, resulting in the improvement of their ultimate flexural capacity, stiffness at the elastic-plastic stage, and crack control ability. Different from the steel-UHPC composite slabs with welded shear connectors, the steel slab and UHPC slab of the demountable steel-UHPC composite slabs could be easily disassembled even in the condition of large deformation. The formulas for the ultimate flexural capacity and flexural stiffness of demountable steel-UHPC composite slabs were derived. It was proposed that the height of UHPC slab should be reduced when calculating the flexural stiffness, and the reduction coefficient (βU) was suggested to be 0. 85 in serviceability state. The theoretical calculation results were in good agreement with the test results. The research results can provide theoretical basis for the design and application of steel-UHPC composite slabs with demountable shear connectors. © 2024 Harbin Institute of Technology. All rights reserved.
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页码：63 / 72
页数：9
相关论文
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