ANALYSIS OF CONCRETE BEAMS WITH CIRCULAR WEB OPENINGS USING STRUT-AND-TIE MODELS

Authors

  • M.A. Mansur M.A. Mansur Department of Structures and Materials, Faculty of Civil Engineering, Universiti Teknologi Malaysia, 81310 Johor Bahru, Johor
  • Kiang-Hwee Tan Department of Civil Engineering, National University of Singapore
  • W. Weng W. Weng Planning Engineer, Paul Y(S) Construction Pte Ltd. Singapore

DOI:

https://doi.org/10.11113/mjce.v18.15733

Keywords:

Cracking, Failure Modes, Reinforced Concrete.

Abstract

This study examines the strut-and-tie model for the analysis of reinforced concrete beams that contain geometric discontinuities in the form of a transverse circular opening in the web. Three T-beams with circular openings tested earlier by the authors have been chosen, and a strut-and-tie model was constructed for each beam. A comparison of the theoretical predictions concerning the ultimate strength, mode of failure and the proportion of applied shear carried by the chord members above and below the opening show good agreement with test results. The truss model also explains clearly the role of diagonal reinforcement in relieving concrete distress at the throat section by transferring a significant amount of applied shear across the discontinuity.

References

Collins, M.P. and Mitchell, D. (1980) Shear and torsion design of prestressed and nonprestressed concrete beams. Journal of the Prestressed Concrete Institute, 25(5): 32-100.

MacGregor, J.G.(1998) Reinforced Concrete: Mechanics and Design. Prentice Hall, London, UK.

Rogowsky D.M. and MacGregor J.G. (1986) Design of deep reinforced concrete continuous beams. Concrete International: Design and Construction, 8(8):49-58. Tan, K.H., Mansur, M.A. and Weng, W. (2001) Design of R/C beams with circular openings. ACI Structural Journal, 98(3): 407-415.

Weng, W. (1998) Concrete Beams with Small Openings Under bending and Shear. MEng Thesis, Department of Civil Engineering, National University of Singapore, Republic of Singapore.

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Published

2018-05-22

Issue

Vol. 18 No. 2 (2006)

Section

Articles

How to Cite

ANALYSIS OF CONCRETE BEAMS WITH CIRCULAR WEB OPENINGS USING STRUT-AND-TIE MODELS. (2018). Malaysian Journal of Civil Engineering, 18(2). https://doi.org/10.11113/mjce.v18.15733