Shear Friction Strength Model of Concrete considering Transverse Reinforcement and Axial Stresses

- Journal title : Journal of the Korea Concrete Institute
- Volume 28, Issue 2, 2016, pp.167-176
- Publisher : Korea Concrete Institute
- DOI : 10.4334/JKCI.2016.28.2.167

Title & Authors

Shear Friction Strength Model of Concrete considering Transverse Reinforcement and Axial Stresses

Hwnag, Yong-Ha; Yang, Keun-Hyeok;

Hwnag, Yong-Ha; Yang, Keun-Hyeok;

Abstract

Shear friction strength model of concrete was proposed to explain the direct friction mechanism at the concrete interfaces intersecting two structural elements. The model was derived from a mechanism analysis based on the upper-bound theorem of concrete plasticity considering the effect of transverse reinforcement and applied axial loads on the shear strength at concrete interfaces. Concrete was modelled as a rigid-perfectly plastic material obeying modified Coulomb failure criteria. To allow the influence of concrete type and maximum aggregate size on the effectiveness strength of concrete, the stress-strain models proposed by Yang et al. and Hordijk were employed in compression and tension, respectively. From the conversion of these stress-strain models into rigidly perfect materials, the effectiveness factor for compression, ratio of effective tensile strength to compressive strength and angle of concrete friction were then mathematically generalized. The proposed shear friction strength model was compared with 91 push-off specimens compiled from the available literature. Unlike the existing equations or code equations, the proposed model possessed an application of diversity against various parameters. As a result, the mean and standard deviation of the ratios between experiments and predictions using the present model are 0.95 and 0.15, respectively, indicating a better accuracy and less variation than the other equations, regardless of concrete type, the amount of transverse reinforcement, and the magnitude of applied axial stresses.

Keywords

shear friction strength;upper-bound theorem;transverse reinforcement;axial stresses;

Language

Korean

Cited by

References

1.

ACI Committee 318, Building Code Requirements for Structural Concrete (ACI 318-11) and Commentary, American Concrete Institute, Farmington Hills, Michigan, USA, 2011, p.187.

2.

Mun, J. H., Mun, J. S., and Yang, K. H., "Stress-Strain Relationship of Heavyweight Concrete Using Magnetite Aggregate", Architectural Institute of Korea, Vol.29, No.8, 2013, pp.85-92.

3.

Yang, K. H., Sim, J. I., Kang, J. H., and Ashour, A. F., "Shear Capacity of Monolithic Concrete Joints Without Transverse Reinforcement", Magazine of Concrete Research, Vol.64, No.9, 2012, pp.767-780.

4.

AASHTO, AAHSTO LRFD Bridge Design Specifications, American Association of State Highway and Transportation Officials, 2012, pp.5.78-5.80.

5.

Shaikh, A. F., "Proposed Revisions to Shear-Friction Provisions", PCI Journal, Vol.23, No.2, 1978, pp.12-21.

6.

Walraven, J. C., Frenay, J., and Pruijssers, A., "Influence of Concrete Strength and Load History on the Shear Friction Capacity of Concrete Members", PCI Journal, Vol.32, No.1, 1987, pp.66-84.

7.

Loov, R. E., and Patnaik, A. K., "Horizontal Shear Strength of Composite Concrete Beams With a Rough Interface", PCI Journal, Vol.39, No.1, 1994, pp.48-69.

8.

Mattock, A. H., "Shear Friction and High-Strength Concrete", ACI Structural Journal, Vol.98, No.1, 2001, pp.50-59.

9.

Nielsen, M. P., Limit Analysis and Concrete Plasticity, CRC Press, USA, 2010, pp.629-644.

10.

Mattock, A. H., 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, 1976, pp.1-35.

11.

Hofbeck, J. A., Ibrahim, I. O., and Mattock, A. H., "Shear Transfer in Reinforced Concrete", ACI Structural Journal, Vol.66, No.2, 1969, pp.119-128.

12.

Mattock, A. H., Li, W. K., and Wang, T. C., "Shear Transfer in Lightweight Reinforced Concrete", PCI Journal, Vol.32, No.1, 1976, pp.20-39.

13.

Mattock, A. H., and Hawkins, N. M., "Shear Transfer in Reinforced Concrete - Recent Research", PCI Journal, Vol.17, No.2, 1972, pp.76-93.

14.

Mattock, A. H., Johal, L., and Chow, H. C., "Shear Transfer in Reinforced Concrete with Moment or Tension Acting Across the Shear Plane", PCI Journal, Vol.20, No.4, 1975, pp.76-93.

15.

Yang, K. H., Mun, J. H., Cho, M. S., and Kang, T. H. K., "A Stress-Strain Model for Various Unconfined Concrete in Compression", ACI Structural Journal, Vol.111, No.4, 2014, pp.819-826.

16.

Hodrdok, D. A. "Local Approach to Fatigue of Concrete", PhD thesis, Delft University of Technology, Delft, Netherlands, 1991, p.210.

17.

CEB-FIP, CEB-FIP Modle Code 1990 for Concrete Structures, Committee Euro International Du Beton, Lausanne, Switzerland, 1993, pp.213-214.