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Steel and Composite Structures Volume 42, Number 6, March25 2022 , pages 765-777 DOI: https://doi.org/10.12989/scs.2022.42.6.765 |
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Experimental investigation on the behaviour of UHPC-steel composite slabs under hogging moment |
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Xiao-Long Gao, Jun-Yan Wang, Chen Bian, Ru-Cheng Xiao and Biao Ma
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| Abstract | ||
| Ultra high performance concrete (UHPC) can be used in the UHPC-steel composite structures especially for bridge structures to achieve high stiffness and high fatigue resistance with low self-weight. The structural performances of UHPC-steel composite slabs subjected to hogging moment have a significant influence on the global stiffness and durability of UHPC-steel composite structures. In order to study the structural behaviors of non-steam-cured UHPC-steel composite slabs subjected to negative moment, five composite slabs combined the thin UHPC layers to steel plates via shear stud connecters with the diameter of 16mm were fabricated and tested under negative moment. The test program aimed to investigate the effect of stud spacing and longitudinal reinforcement ratios on the failure mode, load-deflection behaviors, cracking patterns, bond-slips, and carrying capacities of composite slabs subjected to negative moment. In addition, direct tensile tests for the dog-bone UHPC specimens with longitudinal reinforcement bars were carried out to study the effect of reinforcement bars on the tensile strength of UHPC in the thin structure members. Based on the experimental results, analytical models were also developed to predict the cracking load and ultimate load of UHPC-steel composite slabs subjected to negative moment. | ||
| Key Words | ||
| composite structure; cracking load; direct tensile test; negative moment; UHPC | ||
| Address | ||
| Xiao-Long Gao:1) Key Laboratory of Advanced Civil Engineering Materials, Tongji University, Ministry of Education, Shanghai 201804, China 2) College of Civil Engineering and Architecture, Henan University of Technology, Zhengzhou 450001, China Jun-Yan Wang: Key Laboratory of Advanced Civil Engineering Materials, Tongji University, Ministry of Education, Shanghai 201804, China Chen Bian: Key Laboratory of Advanced Civil Engineering Materials, Tongji University, Ministry of Education, Shanghai 201804, China Ru-Cheng Xiao: College of civil engineering, Tongji University, Shanghai 200092, China Biao Ma: Shanghai Municipal Engineering Design Institute(Group) Co., Ltd., Shanghai 200092, China | ||