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Concrete Beams with Fiber-Reinforced Polymer Shear Reinforcement
Kim, Dae-Jin,Kim, Min Sook,Choi, Jonghoon,Kim, Heecheul,Scanlon, Andrew,Lee, Young Hak American Concrete Institute 2014 ACI structural journal Vol.111 No.4
<p>A new type of fiber-reinforced polymer (FRP) shear reinforcement is proposed for reinforced concrete beams. The new FRP shear reinforcement consists of FRP plate material with openings. The performance of the proposed shear reinforcement was investigated by performing tests on nine concrete beam specimens with a shear span-depth ratio of 2.4. Test parameters include the type of FRP, shape of FRP shear reinforcement, and the amount of the FRP reinforcement. The effects of these parameters on the shear strength of the FRP plate shear reinforced concrete beam were examined. A shear strength equation for concrete beams with the proposed FRP shear reinforcement is proposed based on modifying the existing shear strength equation for concrete beams with steel stirrups in ACI 318-11. The comparison between the test results and the estimations by the proposed equation generally shows good agreement, and the test results indicate that the proposed system is a promising candidate for shear reinforcement in FRP reinforced concrete beams.</p>
Kim, Jeong Tai,Kim, Heecheul,Kim, Sun-Kuk,Kumar, M. Dharmendira,Prabu, Arun Anand American Chemical Society 2012 Journal of chemical and engineering data Vol.57 No.1
<P>In this work, the effect of two dissolved inorganic salts (cadmium chloride, CdCl<SUB>2</SUB>; ammonium chloride, NH<SUB>4</SUB>Cl) on the enthalpy of mixing (<I>H</I><SUP>E</SUP>) of the pyridine + water binary system measured at 303.15 K using an isothermal displacement calorimeter with vapor space is investigated. Compared with the salt-free system, the addition (0.05 mass fraction) of the salts altered the magnitude of <I>H</I><SUP>E</SUP> values to some extent depending on the mole fraction of <I>x</I><SUB>1</SUB>. The importance of the solute–solvent and solvent–solvent interactions was demonstrated from the increasing exothermic <I>H</I><SUP>E</SUP> values with increasing salt concentration (0.10 mass fraction). The experimental values of <I>H</I><SUP>E</SUP> were fitted into the Redlich–Kister polynomial, and the adjustable parameters obtained by the least-squares method are reported.</P>
Flexural behavior of concrete beams reinforced with aramid fiber reinforced polymer (AFRP) bars
Kim, Min Sook,Lee, Young Hak,Kim, Heecheul,Scanlon, Andrew,Lee, Junbok Techno-Press 2011 Structural Engineering and Mechanics, An Int'l Jou Vol.38 No.4
Due to the low elastic modulus of FRP, concrete members reinforced with FRP rebars show greater deflections than members reinforced with steel rebars. Deflection is one of the important factors to consider the serviceability of horizontal members. In this study flexural test of AFRP reinforced concrete beams was performed considering reinforcement ratio and compressive strength as parameters. The test results indicated that flexural capacity and stiffness increase in proportion to the reinforcement ratio. The test results were compared with existing proposed equations for the effective moment of inertia including ACI 440. The most of the proposed equations were found to over-estimate the effective moment of inertia while the equation proposed by Bischoff and Scanlon (2007) most accurately predicted the values obtained through actual testing.
Shear Behavior of Concrete Beams Reinforced with GFRP Shear Reinforcement
Kim, Heecheul,Kim, Min Sook,Ko, Myung Joon,Lee, Young Hak Hindawi Limited 2015 International journal of polymer science Vol.2015 No.-
<P>This paper presents the shear capacities of concrete beams reinforced with glass fiber reinforced polymer (GFRP) plates as shear reinforcement. To examine the shear performance, we manufactured and tested a total of eight specimens. Test variables included the GFRP strip-width-to-spacing ratio and type of opening array. The specimen with a GFRP plate with a3×2opening array showed the highest shear strength. From the test results, the shear strength increased as the strip-width-to-strip-spacing ratio increased. Also, we used the experimental results to evaluate whether the shear strength equations of ACI 318-14 and ACI 440.1R can be applied to the design of GFRP shear reinforcement. In the results, the ACI 440 equation underestimated the experimental results more than that of ACI 318.</P>