Repair of Slab–Column Connections Using Epoxy and Carbon Fiber Reinforced Polymer
Publication: Journal of Composites for Construction
Volume 8, Issue 5
Abstract
Repair, strengthening, and retrofit of reinforced and prestressed concrete members have become increasingly important issues as the World’s infrastructure deteriorates with time. Buildings and bridges are often in need of repair or strengthening to accommodate larger live loads as traffic and building occupancies change. In addition, inadequate design and detailing for seismic and other severe natural events has resulted in considerable structural damage and loss of life, particularly in reinforced concrete buildings. Numerous buildings and bridges suffer damage during such events and need to be repaired. The use of carbon fiber reinforced polymer (CFRP) composite fabric bonded to the surface of concrete members is comparatively simple, quick and virtually unnoticeable after installation. The use of composites has become routine for increasing both the flexural and shear capacities of reinforced and prestressed concrete beams. Earthquake retrofit of bridge and building structures has relied increasingly on composite wrapping of columns, beams and joints to provide confinement and increase ductility. This paper presents the results of cyclic testing of three large-scale reinforced concrete slab–column connections. Each of the specimens was a half-scale model of an interior slab–column connection common to flat-slab buildings. The specimens were reinforced according to ACI-318 code requirements and included slab shear reinforcement. While supporting a slab gravity load equivalent to dead load plus 30% of the live load, the specimens were subjected to an increasing cyclic lateral loading protocol up to 5% lateral drift. The specimens were subjected to the same loading protocol after they were repaired with epoxy crack sealers and CFRP sheet on the surfaces of the slab. Repair with epoxy and CFRP on the top surface of the slab was able to restore both initial stiffness and ultimate strength of the original specimen.
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References
1.
American Concrete Institute (ACI) Committee 318. ( 2002). “Building code requirements for reinforced concrete.” ACI 318-99, Detroit.
2.
American Concrete Institute (ACI) Committee 440. ( 2002). “Guide for the design and construction of externally bonded FRP systems for strengthening concrete structures.” ACI 440R-02, Detroit.
3.
Farhey, D. N., Adin, M. A., and Yankelevsky, D. Z. (1995). “Repaired RC flat-slab-column subassemblages under lateral loading.” J. Struct. Eng., 121(11), 1710–1720.
4.
Federal Emergency Management Agency (FEMA) 356 ( 2000). Prestandard and commentary for the seismic rehabilitation of buildings, Washington, D.C.
5.
Ghali, A., and Megally, S. ( 2000). “Stud shear reinforcement for punching: North American and European practices.” Proc., Int. Workshop on Punching Shear Capacity of RC Slabs, Kungl Tekniska Hogskolan Institute for Byggkonstruktion, Stockholm, Sweden.
6.
Johnson, G., and Robertson, I.N. ( 2001). “Seismic repair and retrofit of reinforced concrete slab–column connections using CFRP.” Rep. No. UHM/CE/01-04, Univ. of Hawaii, Honolulu.
7.
Lee, J., and Robertson, I.N. ( 2001). “Cyclic lateral loading of slab-column connections with slab shear reinforcement.” Rep. No. UHM/CE/01-02, Univ. of Hawaii, Honolulu.
8.
Pan, A., and Moehle, J. P. (1992). “An experimental study of slab–column connections.” ACI Struct. J., 89(6), 626–638.
9.
Robertson, I. N., Kawai, T., Enomoto, B., and Lee, J. (2002). “Cyclic lateral loading of slab–column connections with slab shear reinforcement.” ACI Struct. J., 99(5), 605–613.
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Copyright © 2004 ASCE.
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Published online: Oct 1, 2004
Published in print: Oct 2004
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