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Advances in Materials Science and Engineering
Volume 2016, Article ID 6475161, 9 pages
http://dx.doi.org/10.1155/2016/6475161
Research Article

Shear Stress-Relative Slip Relationship at Concrete Interfaces

Department of Plant & Architectural Engineering, Kyonggi University, Suwon, Republic of Korea

Received 1 May 2016; Revised 29 May 2016; Accepted 28 June 2016

Academic Editor: Pavel Lejcek

Copyright © 2016 Keun-Hyeok Yang. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

This study develops a simple and rational shear stress-relative slip model of concrete interfaces with monolithic castings or smooth construction joints. In developing the model, the initial shear cracking stress and relative slip amount at peak stress were formulated from a nonlinear regression analysis using test data for push-off specimens. The shear friction strength was determined from the generalized equations on the basis of the upper-bound theorem of concrete plasticity. Then, a parametric fitting analysis was performed to derive equations for the key parameters determining the shapes of the ascending and descending branches of the shear stress-relative slip curve. The comparisons of predictions and measurements obtained from push-off tests confirmed that the proposed model provides superior accuracy in predicting the shear stress-relative slip relationship of interfacial shear planes. This was evidenced by the lower normalized root mean square error than those in Xu et al.’s model and the CEB-FIB model, which have many limitations in terms of the roughness of the substrate surface along an interface and the magnitude of equivalent normal stress.