Shear Behavior and Performance of RC Beams with Polymer Mortar Systems Under Cyclic Loading

Abstract

A series of static cyclic loading tests were carried out to investigate the shear behavior and performance of RC beams with three different polymer mortar systems: (1) a (typical) polymer mortar without fibers, (2) a short-fiber reinforced polymer mortar, and (3) a hybrid polymer mortar incorporating honeycomb steel mesh (HPM). The effectiveness of the three different systems under static cyclic loading was investigated through the crack patterns, failure modes, and load-deflection curves of the RC beams. Stiffness degradation and energy dissipation of the RC beams with the three different systems were identified, and the level of damage of structures caused by occurrence, growth, and increase in number of cracks was also analyzed. A hybrid polymer mortar system incorporating a honeycomb steel mesh (HPM system) appears to be a feasible strengthening system for shear-deficient concrete structures. In addition, a comparison between the present experimental result and theoretical result in accordance with the ACI 318 (Building Code Requirements for Reinforced Concrete (ACI 318-89) and Commentary-ACI 318R-89, American Concrete Institute, Farmington Hills) was made to evaluate the shear strength of a control beam as a deep beam.

Keywords

shear performance polymer mortar systems honeycomb steel mesh static cyclic loading arch action ACI 318.

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References

Sundarraja, M.C. , Rajamohan, S. and Bhaskar, D. (2008). Shear Strengthening of RC Beams Using GFRP Vertical Strips-An Experimental , Journal of Reinforced Plastics and Composites, 27(14): 1477-1495.

Ohama, Y. ( 1996). Polymer-based Materials for Repair and Improved Durability: Japanese Experience, Construction and Building Materials, 10(1): 77-82.

Mirza, J. , Mirzab, M.S. and Lapointeb, R. ( 2002). Laboratory and Field Performance of Polymer-modified Cement-based Repair Mortars in Cold Climates, Construction and Building Materials, 16: 365-374.

Afridi, M.U.K. and Chaudhary, Z.U. (1994). Strength and Elastic Properties of Powdered and Aqueous Polymer-modified Mortars, Cement and Concrete Research, 24(7): 1199-1213.

Chajes, M.J. , Januszka, T.F. , Mertz, D.R. and Thomson, T.A. ( 1995). Shear Strengthening of Reinforced Concrete Beams Using Externally Applied Composite Fabrics, ACI Structural Journal , 92: 295-303.

Khalifa, A. and Nanni, A. ( 2000). Improving Shear Capacity of Existing RCT-section Beams Using CFRP Composites, Cement & Concrete Composites , 22: 165-174.

Norris, T. , Saadatmanesh, H. and Ehsani, M.R. ( 1997). Shear and Flexural Strengthening of R/C Beams with Carbon Fiber Sheets, Journal of Structural Engineering , 123(7): 903-911.

Toutanji, H. , Zhao, L. , Deng , Y. , Zang, Y. and Balaguru, P. (2006). Cyclic Behavior of RC Beams Strengthened with Carbon Fiber Sheets Bonded by Inorganic Matrix, Journal of Materials in Civil Engineering , 18: 28-35.

Park, J.Y. , Kim, S.D. , Cho, B.S. and Cheung, J.H. ( 2006). Behavior of RC Beams Strengthened with Carbon Fiber Sheets Under Repeated Loading, Korea Institute for Structural Maintenance Inspection, KSMI, 10(4): 183-192.

10.

Koladi, M.K. and Branson, D. (1972). Short-time Deflections of Beams Under Single and Repeated Load Cycles, ACI Journal , 69(2): 110-117.

11.

Hosny, A. , Shaheen, H. , Abdelrahman, A. and Elafandy, T. ( 2006). Performance of Reinforced Concrete Beams Strengthened by Hybrid FRP Laminates, Cement and Concrete Composites, 28: 906-913.

12.

Bizindavyi, L. , Neale, K.W. and Erki, M. (2003). Experimental Investigation of Bonded Fiber Reinforced Polymer-concrete Joints Under Cyclic Loading, Journal of Composites for Construction , 7: 127-134.

13.

ACI Committee 318 (1989 ). Building Code Requirements for Reinforced Concrete (ACI 318-89) and Commentary-ACI 318R-89, American Concrete Institute , Farmington Hills.

14.

ISO 4012 (1978). Concrete-Determination of Compressive Strength of Test Specimens, International Organization for Standardization, Geneva. Origin software, downloaded from www.originlab.com.

15.

ASTM 3039/D 3039M ( 2007). Standard Test Method for Tensile Properties of Polymer Matrix Composite Materials , ASTM International, Philadelphia .

16.

Slight, B.W. (1970). Comparison of Length and Shear Span Parameters in Deep Beams, MEng Thesis, Faculty of Engineering, Carleton University, Ottawa, Ont.

17.

Rueter, D.A. (1972). Influence of Reinforcement Percentage on Deep Beam Behavior, MEng Thesis, Faculty of Engineering, Carleton University, Ottawa, Ont.

18.

Omeman, Z. , Nehdi, M. and El-Chabib, H. ( 2008). Experimental Study on Shear Behavior of Carbon Fiber-reinforced Polymer Reinforced Concrete Shear Beams Without Web Reinforcement , Canadian Journal of Civil Engineering, 35: 1-10.

19.

Ko, S.W. ( 2007). Behavior of Bending Failures in the R/C Beams Strengthened with FRP-rod, GFSP, Master’s Thesis, Kyungsung University .

20.

Crist, R.A. ( 1967). Shear Behavior of Deep Reinforced Concrete Beams, Static tests, AFWL-TR-67-61, Kirkland Air Force Base, Mexico, Oct.

21.

Crist, R.A. ( 1971). Static and Dynamic Shear Behavior of Uniformly Reinforced Concrete Deep Beams, Report No. AFWL-TR-71-74, University of New Mexico (CERF), Kirkland Air Force Base, Mexico , Nov.

22.

de Pavia, H.A.R. and Siess, C.P. (1965). Strength and Behavior of Deep Beams in Shear, ASCE Proceedings, 91: 19-41.

23.

Stephen, J.F. and Gilbert, R.I. (1998). Experimental Studies on High-strength Concrete Deep Beams, ACI Structural Journal , 95: 382-390.

24.

Joint ASCE-ACI Task Committee on Shear and Diagonal Tension of the Committee on Masonry and Reinforced Concrete of the Structural Division. (1973). The Shear Strength of Reinforced Concrete Members, Journal of the Structural Division, ASCE Proceedings, 99: 1091-1187.