Effect of Construction Joint on the Shear Friction Strength of Concrete

Title & Authors
Effect of Construction Joint on the Shear Friction Strength of Concrete
Hwang, Yong-Ha; Yang, Keun-Hyeok;

Abstract
To evaluate the shear friction performance of concrete interfaces with construction joint, a total of 18 push-off specimens were tested under direct shear and constant axial compressive forces. The main parameters investigated were concrete unit weight, arrangement type of transverse reinforcement (V-type for perpendicular configuration to the shear plane and X-type for $\small{45^{\circ}}$-degree inclined configuration), and the magnitude of axial compressive stresses. The initial shear cracking stress and the slope at the ascending branch of the shear load-relative slip relationship were independent of the type of transverse reinforcement and concrete unit weight, whereas they tended to increase as the axial compressive stresses increases. The shear friction strength increased in proportion to the summation of the applied axial stresses and shear transfer capacity ($\small{{\rho}_{vf}f_y}$) of transverse reinforcement. The X-type transverse reinforcement had higher shear transfer capacity than the V-type reinforcement. From the mechanical model derived using the upper bound theorem of concrete plasticity, the concrete cohesion and coefficient of friction at the interfaces with construction joint could be estimated to be 1.56 MPa and $\small{36.3^{\circ}}$, respectively.
Keywords
Shear Friction Capacity;Construction Joint;Relative Slip;Transverse Reinforcement;Compressive Stress;
Language
Korean
Cited by
1.
Shear Stress-Relative Slip Relationship at Concrete Interfaces, Advances in Materials Science and Engineering, 2016, 2016, 1
References
1.
AASHTO. (2012). AAHSTO LRFD Bridge Design Specifications, American Association of State Highway and Transportation Officials, 5.78-5.80.

2.
ACI Committee 318. (2011). Building Code Requirements for Structural Concrete (ACI 318-11) and Commentary, American Concrete Institute, Farmington Hills, Michigan, USA.

3.
European Committee. (2004). Eurocode 8 : Design of structures for Earthquake Resistance(BS EN-1998), European Commission.

4.
Hofbeck, J. A., Ibrahim, I. O., & Mattock, A. H. (1969). Shear Transfer in Reinforced Concrete, ACI Structural Journal, 66(2), 119-128.

5.
Kim, S. C., & Park, S. Y. (2005). A Study on Shear Steel Effect on RC Deep Beams, Journal of the Korean Society of Civil Engineers, 25(2), 365-373.

6.
Mattock, A. H. (1976). Shear Transfer under Monotonic Loading, Acrossan Interface Between Concretes Cast at Different Times, Report No. SM76-3, University of Washington Department of Civil Engineering, Seattle, Washington, 1-35.

7.
Mattock, A. H. (2001). Shear Friction and High-Strength Concrete, ACI Structural Journal, 98(1), 50-59.

8.
Mattock, A. H., & Hawkins, N. M. (1972). Shear Transfer in Reinforced Concrete - Recent Research, PCI Journal, 17(2), 76-93.

9.
Mattock, A. H., Johal, L., & Chow, H. C. (1975). Shear Transfer in Reinforced Concrete with Moment or Tension Acting Across the Shear Plane, PCI Journal, 20(4), 76-93.

10.
Mattock, A. H., Li, W. K., & Wang, T. C. (1976). Shear Transfer in Lightweight Reinforced Concrete, PCI Journal, 32(1), 20-39.

11.
Nielsen, M. P., & Hoang, L. C. (2010). Limit Analysis and Concrete Plasticity, CRC Press, USA, 629-644.

12.
Yang, K. H. (2015). Development of performance-based design guideline for high-density concrete walls, University of Kyonggi Department of Plant.Architectural Engineering, Suwon, Korea, 25-63.