Shear design of high strength concrete prestressed girders

Emad L. LABIB, Hemant B. DHONDE, Thomas T. C. HSU, Y. L. MO

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Front. Struct. Civ. Eng. ›› 2014, Vol. 8 ›› Issue (4) : 373-387. DOI: 10.1007/s11709-014-0087-7
RESEARCH ARTICLE

Shear design of high strength concrete prestressed girders

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Abstract

Normal strength prestressed concrete I-girders are commonly used as the primary superstructure components in highway bridges. However, shear design guidelines for high strength PC girders are not available in the current structural codes. Recently, ten 7.62 m (25 feet) long girders made with high strength concrete were designed, cast, and tested at the University of Houston (UH) to study the ultimate shear strength and the shear concrete contribution (Vc) as a function of concrete strength (f\hskip -3ptc). A simple semi-empirical set of equations was developed based on the test results to predict the ultimate shear strength of prestressed concrete I-girders. The UH-developed set of equations is a function of concrete strength (f\hskip -3ptc), web area (bwd), shear span to effective depth ratio (a/d), and percentage of transverse steel (ρt). The proposed UH-Method was found to accurately predict the ultimate shear strength of PC girders with concrete strength up to 117 MPa (17000 psi) ensuring satisfactory ductility. The UH-Method was found to be not as overly conservative as the ACI-318 (2011) code provisions, and also not to overestimate the ultimate shear strength of high strength PC girders as the AASHTO LRFD (2010) code provisions. Moreover, the proposed UH-Method was found fairly accurate and not exceedingly conservative in predicting the concrete contribution to shear for concrete strength up to 117 MPa (17000 psi).

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shear design / high strength concrete / prestressed girders / full-scale tests

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Emad L. LABIB, Hemant B. DHONDE, Thomas T. C. HSU, Y. L. MO. Shear design of high strength concrete prestressed girders. Front. Struct. Civ. Eng., 2014, 8(4): 373‒387 https://doi.org/10.1007/s11709-014-0087-7

References

[1]
Laskar A, Hsu T T C, Mo Y L. Shear strength of prestressed concrete girders part 1: Experiments and shear design equations. ACI Structural Journal, 2010, 107(3): 330–339
[2]
Belarbi A, Hsu T T C. Constitutive laws of concrete in tension and reinforcing bars stiffened by concrete. ACI Structural Journal, 1994, 91(4): 465–474
[3]
Belarbi A, Hsu T T C. Constitutive Laws of Softened Concrete in Biaxial Tension-Compression. ACI Structural Journal, 1995, 92(5): 562–573
[4]
Pang X B, Hsu T T C. Fixed-angle softened-truss model for reinforced concrete. ACI Structural Journal, 1996, 93(2): 197–207
[5]
Hsu T T C, Zhang L X. Tension stiffening in reinforced concrete membrane elements. ACI Structural Journal, 1996, 93(1): 108–115
[6]
Zhang L X, Hsu T T C. Behavior and analysis of 100MPa concrete membrane elements. Journal of Structural Engineering, 1998, 124(1): 24–34
[7]
Laskar A, Wang J, Hsu T T C, Mo Y L. Rational Shear Provisions for AASHTO LRFD Specifications. Technical Report 0−4759−1 to Texas Department of Transportation, Department of Civil and Environmental Engineering, University of Houston, Houston, TX, 2007, 216
[8]
Loov R E. Shear Design of Uniformly Loaded Girders. Presented at the Sixth International Conference on Short and Medium Span Bridges, Vancouver, Canada, 2002-July-31
[9]
Laskar A. Shear behavior and design of prestressed concrete members. Dissertation for the Doctoral Degree. Houston: University of Houston, 2009, 322
[10]
TxDOT 0−4759−1. Rational Shear Provisions for AASHTO LRFD specifications. Technical Report 0−4759−1, by Laskar A, Wang J, Hsu T T C, Mo Y L. Texas Department of Transportation, TX, University of Houston, TX, 2007
[11]
ASTM C 494/C 494M−99. Standard Specification for Chemical Admixtures for Concrete. ASTM International, West Conshohocken, P A, 1999, 10
[12]
ACI-318. Building Code Requirements for Structural Concrete Commentary. American Concrete Institute, Farmington Hills, Michigan, 2011
[13]
AASHTO. AASHTO LRFD Bridge Design Specifications. 4th ed. American Association of State Highway and Transportation Officials (AASHTO), Washington, D C, 2010
[14]
Labib E L. Shear behavior and design of high strength concrete prestressed bridge girders. Dissertation for the Doctoral Degree. Houston: University of Houston, 2012, 592
[15]
Bennett E W, Balasooriya B M A. Shear strength of prestressed girders with thin webs failing in inclined compression. ACI Journal Proceedings, 1971, 69(3): 204–212
[16]
Rangan B V. Web crushing strength of reinforced and prestressed concrete girders. ACI Structural Journal, 1991, 88(1): 12–16
[17]
Ma Z J, Tadros M K, Baishya M. Shear behavior of pretensioned high-strength concrete bridge I-girders. ACI Structural Journal, 2000, 97(1): 185–193
[18]
NCHRP 549. Simplified Shear Design of Structural Concrete Members. NCHRP Report 549, Transportation Research, 2005
[19]
TxDOT 0-6152-2. Shear in High Strength Concrete Bridge Girders. Technical Report 0−6152−2, by Labib E L, Dhonde B H, Howser R, Mo Y L, Hsu T T C, Ayoub A. Texas Department of Transportation, Department of Civil and Environmental Engineering, University of Houston, Houston, TX, 2013, 303
[20]
Hernandez G. Strength of Prestressed Concrete Girders with Web Reinforcement. Report, the Engineering Experiment Station, University of Illinois, Urbana, Illinois, 1958, 135
[21]
Mattock A H, Kaar P H. Precast-prestressed concrete bridges – 4: Shear tests of continuous girders. Journal of the PCA Research Development Laboratories, 1961, 19–47
[22]
Hanson J M, Hulsbos C L. Overload Behavior of Pretensioned Prestressed Concrete I-Girders with Web Reinforcement. Highway Research Record 76, Highway Research Board, 1965, 1–31
[23]
Elzanaty A H, Nilson A H, Slate F O. Shear capacity of prestressed concrete girders using high-strength concrete. ACI Journal, 1986, 83(3): 359–368
[24]
Kaufman M K, Ramirez J A. Re-evaluation of ultimate shear behavior of high-strength concrete prestressed I-girders. ACI Structural Journal, 1988, 85(3): 295–303
[25]
MacGregor J G, Sozen M A, Siess C P. Strength and Behavior of Prestressed Concrete Girders with Web Reinforcement. Research Report, The Engineering Experiment Station, University of Illinois, Urbana, Illinois, 1960
[26]
Bruce R N. An experimental study of the action of web reinforcement in prestressed concrete girders. Dissertation for the Doctoral Degree. Champaign: University of Illinois Urbana, 1962
[27]
Lyngberg B S. Ultimate shear resistance of partially prestressed reinforced concrete I-girders. ACI Journal, 1976, 73(4): 214–222
[28]
Robertson I N, Durrani A J. Shear strength of prestressed concrete T girders with welded wire fabric as shear reinforcement. PCI Journal, 1987, 32(2): 46–61
[29]
Shahawy M A, Batchelor B. Shear behavior of full-scale prestressed concrete girders: Comparison between AASTHO specifications and LRFD code. PCI Journal, Precast/Prestressed Concrete Institute, 1996, 41(3): 48–62

Acknowledgements

The authors gratefully acknowledge the financial support provided by the Texas Department of Transportation (TxDOT) through TxDOT project number 0-4759. The cooperation of precasters- Texas Concrete Company, Victoria TX, USA and Flexicore of Texas, Houston-TX, USA is highly appreciated.

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2014 Higher Education Press and Springer-Verlag Berlin Heidelberg
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