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Steel and Composite Structures
  Volume 35, Number 2, April25 2020, pages 261-278
DOI: http://dx.doi.org/10.12989/scs.2020.35.2.261
 


Experimental study on steel-concrete composite beams with Uplift-restricted and slip-permitted screw-type (URSP-S) connectors
Linli Duan, Hongbing Chen, Xin Nie and Sanwei Han

 
Abstract
    In steel-concrete composite beams, to improve the cracking resistance of the concrete slab in the hogging moment region, a new type of connector in the interface, named uplift-restricted and slip-permitted screw-type (URSP-S) connector has been proposed. This paper focuses on the behavior of steel-concrete composite beams with URSP-S connectors. A total of three beam specimens including a simply supported beam with URSP-S connectors and two continuous composite beams with different connectors arrangements were designed and tested. More specifically, one continuous composite beam was equipped with URSP-S connectors in negative moment region and traditional shear studs in other regions. For comparison, the other one was designed with only traditional shear studs. The failure modes, crack evolution process, ultimate capacities, strain responses at different locations as well as the interface slip of the three tested specimens were measured and evaluated in-depth. Based on the experimental study, the research findings indicate that the larger slip deformation is allowed while using URSP-S connectors. Meanwhile, the tensile stress reduces and the cracking resistance of the concrete slab improves accordingly. In addition, the overall stiffness and strength of the composite beam become slightly lower than those of the composite beam using traditional shear studs. Moreover, the arrangement suggestion of URSP-S connectors in the composite beam is discussed in this paper for its practical design and application.
 
Key Words
    steel-concrete composite beam; uplift-restricted and slip-permitted screw-type (URSP-S) connector; experimental study; cracking resistance; interface slip
 
Address
Linli Duan: College of Civil Engineering, Hunan University, Changsha 410082, China
Hongbing Chen: Key Laboratory of Civil Engineering Safety and Durability of China Education Ministry,
Department of Civil Engineering, Tsinghua University, Beijing 100084, China
Xin Nie: Key Laboratory of Civil Engineering Safety and Durability of China Education Ministry,
Department of Civil Engineering, Tsinghua University, Beijing 100084, China;
National Engineering Laboratory for Green and Safe Construction Technology in Urban Rail Transit,
Tsinghua University, Beijing 100084, China
Sanwei Han: Key Laboratory of Civil Engineering Safety and Durability of China Education Ministry,
Department of Civil Engineering, Tsinghua University, Beijing 100084, China



 

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