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Computers and Concrete
  Volume 23, Number 5, May 2019 , pages 335-349
DOI: https://doi.org/10.12989/cac.2019.23.5.335
 


Experimental study on shear damage and lateral stiffness of transfer column in SRC-RC hybrid structure
Kai Wu, Jiangpeng Zhai, Jianyang Xue, Fangyuan Xu and Hongtie Zhao

 
Abstract
    A low-cycle loading experiment of 16 transfer column specimens was conducted to study the influence of parameters, likes the extension length of shape steel, the ratio of shape steel, the axial compression ratio and the volumetric ratio of stirrups, on the shear distribution between steel and concrete, the concrete damage state and the degradation of lateral stiffness. Shear force of shape steel reacted at the core area of concrete section and led to tension effect which accelerated the damage of concrete. At the same time, the damage of concrete diminished its shear capacity and resulted in the shear enlargement of shape steel. The interplay between concrete damage and shear force of shape steel ultimately made for the failures of transfer columns. With the increase of extension length, the lateral stiffness first increases and then decreases, but the stiffness degradation gets faster; With the increase of steel ratio, the lateral stiffness remains the same, but the degradation gets faster; With the increase of the axial compression ratio, the lateral stiffness increases, and the degradation is more significant. Using more stirrups can effectively restrain the development of cracks and increase the lateral stiffness at the yielding point. Also, a formula for calculating the yielding lateral stiffness is obtained by a regression analysis of the test data.
 
Key Words
    lateral stiffness; transfer column; SRC-RC hybrid structure; shear distribution; concrete damage
 
Address
Kai Wu: College of Civil and Transportation Engineering, Hohai University, No. 1 Xikang Road, Gulou District, Nanjing city, PR China; Department of Civil and Environmental Engineering, National University of Singapore, 21 Lower Kent Ridge Road, Singapore
Jiangpeng Zhai: College of Civil and Transportation Engineering, Hohai University, No. 1 Xikang Road, Gulou District, Nanjing city, PR China
Jianyang Xue: School of Civil Engineering, Xi\'an University of Architecture & Technology, No. 13 Yanta Road Middle Section, Beilin District, Xi\'an City, PR China
Fangyuan Xu: College of Civil and Transportation Engineering, Hohai University, No. 1 Xikang Road, Gulou District, Nanjing city, PR China
Hongtie Zhao: School of Civil Engineering, Xi\'an University of Architecture & Technology, No. 13 Yanta Road Middle Section, Beilin District, Xi\'an City, PR China
 

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