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http://dx.doi.org/10.4334/JKCI.2009.21.1.075

Strain-Based Shear Strength Model for Prestressed Beams  

Kang, Soon-Pil (Dept. of Architecture, Seoul National University)
Choi, Kyoung-Kyu (Dept. of Architectural Engineering, Dankook University)
Park, Hong-Gun (Dept. of Architecture, Seoul National University)
Publication Information
Journal of the Korea Concrete Institute / v.21, no.1, 2009 , pp. 75-84 More about this Journal
Abstract
An analytical model for predicting the shear strength of prestressed concrete beams without shear reinforcement was developed, on the basis of the existing strain-based shear strength model. It was assumed that the compression zone of intact concrete in the cross-section primarily resisted the shear forces rather than the tension zone. The shear capacity of concrete was defined based on the material failure criteria of concrete. The shear capacity of the compression zone was evaluated along the inclined failure surface, considering the interaction with the compressive normal stress. Since the distribution of the normal stress varies with the flexural deformation of the beam, the shear capacity was defined as a function of the flexural deformation. The shear strength of a beam was determined at the intersection of the shear capacity curve and the shear demand curve. The result of the comparisons to existing test results showed that the proposed model accurately predicted the shear strength of the test specimens.
Keywords
shear strength; prestressed concrete; compression zone; failure surface;
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1 Sozen, M. A., Zwoyer, E. M., and Siess, C. P., “Investigation of Prestressed Concrete for Highway Bridge, Part1-Strength in Shear of Beams without Web Reinforcement,” Engineering Experiment Station Bulletin, No. 452, University of Illinois, Urbana, 1959, 69 pp.
2 Kar, J. N., “Diagonal Cracking in Prestressed Concrete Beams,” Proceedings, ASCE, Vol. 94, ASCE 1968, pp. 83-109.
3 Kupfer, H., Hilsdorf, H. K., and Rusch, H., “Behavior of Concrete Under Biaxial Stresses,”ACI Journal, Proceedings, Vol. 66, No. 8, 1969, pp. 656-666.
4 Choi, K. K., Park, H. G., and Wight, J. K., “Unified Shear Strength Model for Reinforced Concrete beams-Part:Development,” ACI Structural Journal, Vol. 104, No. 2, 2007, pp. 142-152.
5 ACI Committee 318, Building Code Requirements for Structural Concrete (ACI 318-05) and Commentary (ACI 318R-05), American Concrete Institute, Farmington Hills, MI, 2005, 430 pp.
6 Eurocode 2, “Design of Concrete Structures-Part1-1:General Rules and Rules for Buildings,”CEN, EN 1992-1-1, Brussels, Belgium, 2004, 225 pp.
7 Tureyen, A. K. and Frosch, R. J., “Concrete Shear Strength:Another Perspective,”ACI Structural Journal, Vol. 100, No. 5, 2003, pp. 609-615.
8 Chen, W. F., Plasticity in Reinforced Concrete, McGraw - Hill, New York, 1982, 474 pp.
9 Park, H. G., Choi, K. K., and Wight, J. K., “Strain-Based Shear Strength Model for Slender Beams without Web Reinforcement,”ACI Structural Journal, Vol. 103, No. 6, 2006, pp. 783-793.
10 Vecchio, F. J. and Collins, M. P., “The Modified Compression-Field Theory for Reinforced Concrete Elements Subject to Shear,”ACI Journal, Proceedings, Vol. 83, No. 2, 1986, pp. 219-231.
11 Zararis, P. D. and Papadakis, G. C., “Diagonal Shear Failure and Size Effect in RC Beams without Web Reinforcement,” Journal of Structural Engineering, ASCE, Vol. 127, No. 7, 2001, pp. 733-742.   DOI   ScienceOn
12 Choi, K. K., Reda Taha, M. M., Park, H. G., and Maji, A.K. “Punching Shear Strength of Interior Concrete Slab-Column Connections Reinforced with Steel Fibers,”Cement and Concrete Composites, Vol. 29, No. 5, 2007, pp. 409-420.   DOI   ScienceOn
13 MacGregor, J. G., Strength and Behavior of Prestressed Concrete Beams with Web Reinforcement, PhD thesis, Dept. of Civil Engrg. University of Illinois, 1960, 295 pp.
14 Baznt, Z. P. and Cao, Z., “Size Effect of Shear Failure in Prestressed Concrete Beams,”ACI Journal, Proceedings, Vol. 83, No. 2, 1986, pp. 260-268.
15 Wolf, T. S. and Frosch R. J., “Shear Design of Prestressed Concrete:A Unified Approach,”Journal of Structural Engineering, ASCE, Vol. 133, No. 11, 2007, pp. 1512-1519.   DOI   ScienceOn