Techno Press


Steel and Composite Structures   Volume 27, Number 4, May25 2018, pages 495-508
DOI: http://dx.doi.org/10.12989/scs.2018.27.4.495
 
Shear behavior of composite frame inner joints of SRRC column-steel beam subjected to cyclic loading
Hui Ma, Sanzhi Li, Zhe Li, Yunhe Liu, Jing Dong and Peng Zhang

 
Abstract     [Full Text]
    In this paper, cyclic loading tests on composite frame inner joints of steel-reinforced recycled concrete (SRRC) column.steel beam were conducted. The main objective of the test was to obtain the shear behavior and analyze the shear strength of the joints. The main design parameters in the test were recycled coarse aggregate (RCA) replacement percentage and axial compression ratio. The failure process, failure modes, hysteresis curves and strain characteristics of the joints were obtained, and the influences of design parameters on the shear strength of the joints have been also analysed in detail. Results show that the failure modes of the joints area are typical shear failure. The shear bearing capacity of the joints maximally decreased by 10.07% with the increase in the RCA replacement percentage, whereas the shear bearing capacity of the joints maximally increased by 16.6% with the increase in the axial compression ratio. A specific strain analysis suggests that the shear bearing capacity of the joints was mainly provided by the three shear elements of the recycled aggregate concrete (RAC) diagonal compression strut, steel webs and stirrups of the joint area. According to the shear mechanism and test results, the calculation formulas of the shear bearing capacity of the three main shear elements were deduced separately. Thus, the calculation model of the shear bearing capacity of the composite joints considering the adverse effects of the RCA replacement percentage was established through a superposition method. The calculated values of shear strength based on the calculation model were in good agreement with the test values. It indicates that the calculation method in this study can reasonably predict the shear bearing capacity of the composite frame inner joints of SRRC column–steel beam.
 
Key Words
    SRRC columns; steel beams; composite frame; inner joints; shear bearing capacity; cyclic loading
 
Address
(1) Hui Ma, Sanzhi Li, Zhe Li, Yunhe Liu, Jing Dong, Peng Zhang:
School of Civil Engineering and Architecture, Xi'an University of Technology, Xi'an, China;
(2) Hui Ma, Yunhe Liu:
State Key Laboratory Base of Eco-hydraulic Engineering in Arid Area, Xi'an University of Technology, Xi'an, China.
 

Techno-Press: Publishers of international journals and conference proceedings.       Copyright © 2019 Techno Press
P.O. Box 33, Yuseong, Daejeon 305-600 Korea, Tel: +82-42-828-7996, Fax : +82-42-828-7997, Email: technop@chol.com