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Abstract
Recently, works have been undertaken 10 strcugth reinforced c:oncrete members using non-corroded, light-weight. high-stmJgtb fiber sheets which am bonded to the surface of the member. The used sheet in this rcseard1 work is glass fiber reinfbrced polymer sbeet(GFRP).
This research work prescnIB the results of an experime:mal investigation into the fleJanI, shear, and long term loading behavior of COIIC1’C1I: beams. Plain concrete beams used to study the t1cxural bcbavior of ~ beams. Rcinfuroed concrete beams used to study tbe flexural behavior in addition to shear and long term loeding behavior •
The inf1ueoce of number of layers of GFRP sheet aM the ambient tI:mpenture am discussed in 1he flexural behavior of plain ccncn:Ie beams. For reintim:cd c:onaete beams, the intlueoce of CODCI’ete compressive strcugth and DUmber of layers of OFRP &beet D aJso discussed.
The shl’Jar behavior of strengthenrd reinforced beams includes beams with and without internal shear reinforcement. The influence: of the shear strengthcniug method is discussed.
For flexural long term loading behavior up to 400 days of reiDfon:ed c:onacte beams stnmgtbened wtth GFRP sbeet.the effect of number of layers and .concrete compressive sIrCIIgtb D studied.
AJso, theorctica1 method to pcedict IoBd- det1cc:tion relation for ~
. the use of GFRP sheets as flexural external reinforcement increases the ultimate load carrying cap8City. This enhancement increases as the nwnbcr of layers increase
In addition to the longitudinal layers. the GFRP sheet oriented in the vertical direction forming U-strips and U:iad«:t around the beam cross section reduces deflection at the same load JIIld increases load carrying capacity.
For flexural long tenn behavior, it can be concluded that the increase of OFRP number oflaycrs cfl.ectively decreases the def1cction ofbcams after 400 days.
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