Punching Shear Behavior of Flat Slabs Strengthened with Fiber Reinforced Polymer Laminates
Publication: Journal of Composites for Construction
Volume 8, Issue 5
Abstract
The present work reports the test results of seven full-scale reinforced concrete slab-column edge connections strengthened against punching shear using different methods. In this study, three slabs contained openings in the vicinity of the column, and the other four were without openings. The dimensions of the slabs were 1,540×1,020×120 mm with square columns (250×250 mm). The openings in the specimens were square (150×150 mm) with the sides parallel to the sides of the column. The slabs were reinforced with an average reinforcement ratio of 0.75%. Except for the two reference slabs, two different strengthening techniques were considered. Technique I applies externally bonded fiber reinforced polymer (FRP) flexible sheets on the slab around the column in two schemes with one or two layers of FRP sheets glued to the tension face or both tension and compression faces of the slab. Both glass and carbon FRP sheets were considered. Technique II applies externally bonded FRP sheets using either the first or second scheme combined with installing steel bolts through holes across the slab thickness around the column. Based on the test results, it is concluded that the presence of FRP sheets and steel bolts substantially increased the punching capacity of the connections. Code design expressions were conservative in predicting the experimental results.
Get full access to this article
View all available purchase options and get full access to this article.
References
1.
American Concrete Institute (ACI). (2002a). “Building code requirements for structural concrete and commentary.” ACI 318-02, Farmington Hills, Mich.
2.
American Concrete Institute (ACI). (2002b). “Design and construction of externally bonded FRP systems for strengthening concrete structures.” ACI 440.2R-02, Farmington Hills, Mich.
3.
Canadian Standards Association (CSA). (1994). “Design of concrete structures for buildings.” A23.3–94, Rexdale, Ont., Canada.
4.
Canadian Standards Association (CSA). (2002). “Design and construction of building components with fibre-reinforced polymers.” CSA S806–02, CSA, Rexdale, Ont., Canada.
5.
Chen, C.C., and Li, C.Y. ( 2000). “An experimental study on the punching shear behaviour of RC slabs.” Proc., Int. Workshop on Punching Shear Capacity on RC Slabs, Royal Institute of Technology, Stockholm, 415–422.
6.
El-Salakawy, E. F., Polak, M. A., and Soliman, M. H. (1999). “Reinforced concrete slab–column edge connections with openings.” ACI Struct. J., 96(1), 79–87.
7.
El-Salakawy, E. F., Polak, M. A., and Soliman, M. H. (2000). “Shear studs reinforcement in slab-column edge connections.” Can. J. Civ. Eng., 27(2), 338–348.
8.
El-Salakawy, E. F., Polak, M. A., and Soudki, K. A. (2002). “Rehabilitation and strengthening of reinforced concrete slab–column connections.” Can. J. Civ. Eng., 29(4), 602–611.
9.
El-Salakawy, E. F., Polak, M. A., and Soudki, K. A. (2003). “New shear strenghtening technique for concrete slab–column connections.” ACI Struct. J., 100(3), 297–304.
10.
Erki, M.A., and Heffernan, P.J. ( 1995). “Reinforced concrete slabs externally strengthened with fibre reinforced plastics materials.” Proc., 2nd Int. Symp. on Nonmetalic FRP reinforcement for Concrete Structures, L. Taerwe, ed., University of Ghent, Belgium, 509–516.
11.
Ghali, A., Sargious, M.A., and Huizer, A. ( 1974). “Vertical prestressing of flat plates around columns.” Shear in Reinforced Concrete, ACI Special Publication No. SP-42(2), Farmington Hills, Mich., 905–920.
12.
Harajli, M. H., and Soudki, K. A. (2003). “Shear strengthening of interior slab–column connections using carbon fiber-reinforced polymer sheets.” J. Compos. Constr., 7(2), 145–153.
13.
Ichimasu, H., Maruyama, M., Watanabe, H., and Hirose, T. ( 1993). “RC slabs strengthened by bonded carbon FRP plates.” Int. Symp. on Fibre Reinforced Polymer Reinforcements for Concrete Structures, ACI Special Publication No. SP-138, Farmington Hills, Mich., 932–955.
14.
ISIS Canada. (2001), “Strengthening reinforcing concrete structures with externally- bonded fibre reinforced polymers.” The Canadian Network of Centers of Excellence on Intelligent Sensing for Innovative Structures, ISIS M04–01, Univ. of Winnipeg, Man., Canada.
15.
Karbhari, V.M., Seible, F., Seim, W., and Vasques, A. ( 1996). “Poststrengthening of concrete slabs.” Int. Symp. on Fibre Reinforced Polymer Reinforcements for Concrete Structures, ACI Special Publication No. SP-188, Farmington Hills, Mich., 1163–1173.
16.
Malvar, L.J., Warren, G.E., and Inaba, C.M. ( 2000). “Large scale tests on Navy reinforced concrete pier decks strengthened with CFRP sheets.” Proc., 3rd Int. Conf. on Advanced Composite Materials in Bridges and Structures, Humar and Razaqpur, eds., Canadian Society of Civil Engineering (CSCE), Montreal, 497–504.
17.
Ramos, A.M., Lucio, V.J., and Regan, P.E. ( 2000). “Repair and strengthening methods of flat slabs for punching.” Proc., Int. Workshop on Punching Shear Capacity on RC Slabs, 125–133.
18.
Tan, K.H. ( 1996). “Punching shear strength of RC slabs bonded with FRP systems.” Proc., 2nd Int. Conf. on Advanced Composite Materials in Bridges and Structures, El-Badry, ed., Canadian Society of Civil Engineering (CSCE), Montreal, 387–394.
Information & Authors
Information
Published In
Journal of Composites for Construction
Volume 8 • Issue 5 • October 2004
Pages: 384 - 392
Copyright
Copyright © 2004 ASCE.
History
Published online: Oct 1, 2004
Published in print: Oct 2004
Authors
Metrics & Citations
Metrics
Citations
Download citation
If you have the appropriate software installed, you can download article citation data to the citation manager of your choice. Simply select your manager software from the list below and click Download.