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The Influence of Shear Strain on the Torsion Capacity of Hybrid Beams | ||
| Engineering and Technology Journal | ||
| Article 1, Volume 38, 7A, 2020, Pages 951-959 PDF (1.76 M) | ||
| Document Type: Research Paper | ||
| DOI: 10.30684/etj.v38i7A.371 | ||
| Authors | ||
| Alyaa H. Mohammed* 1; Kaiss F. Sarsam2; Qais A. Hasan2 | ||
| 1Civil Engineering Department, University of Technology - Iraq | ||
| 2Civil Engineering Department, University of Technology-Iraq | ||
| Abstract | ||
| This research discusses experimentally the shear strain of the reinforcement concrete hybrid beams composed of reactive powder concrete (RPC) at the peripheral and conventional concrete (CC) at the core beams under torsional strength tests. Shear strain is usually represented by is explained as the tangent of the angle and is be like the length of deformation at its maximum divided by the length of perpendicular in the plane of the force application. Twelve reinforced concrete beams are tested having the following dimensions: 100, 200 and 1500mm as width, height and length respectively with thickness of the RPC concrete were 40 and 20mm. The beams were cast and tested to failure in torsion by using two opposite cantilevers steel arms that contribute to transferring the torque to the centre of the beams. Two control (CC and RPC) beams were poured, and the ten other beams were all poured as hybrid ones. Experimental data of the three strain gauges locations in the middle of the beams in one of the side surface face, to calculate shear strain (). The percentage of shear strain at ultimate torsion capacity was reduced by about 76% for RPC (RP) to CC (NC) beams and 63% for hybrid beam (H1) to CC (NC) beam. | ||
| Keywords | ||
| Shear strain; Conventional concrete; hybrid concrete; Reactive powder concrete; Steel fibre | ||
| References | ||
|
[1] A. M. Jassim, “Torsional behavior of hybrid reinforced concrete box girders composed of conventional concrete and modified reactive powder concrete,” MSc. Thesis, Civil Eng. Dept., Univ. of AL-Mustansiryah, Iraq, 2017. [2] J. R. Hillman, “Hybrid - composite beam (HCB) design and maintenance manual,” The Missouri Department of transportation. 27 Aug., 2012. [3] S. M. Al-Zuabidi, “Strengthening of RPC beams with external CFR in torsion,” MSc. Thesis, Civil Eng. Dept., Univ. of Technology, Iraq, 2016. [4] P. Kumar, M. Mahanty and A. Chattopadhyay, “An overview of stress-strain analysis for elasticity equations,” 20018. [5] ACI Committee 318, “Building code requirements for structural concrete (ACI318M) and commentary (ACI318RM),” American Concrete Institute, Michigan, USA, 2014. [6] Tokyo Sokki Kenkyujo Co., Ltd. (TML). “Strain gauges types [PL-60-11-3LJC-F],” www.tml.jp. [7] ASTM C 39/C39M-14, „„Standard test method for compressive strength of cylindrical concrete specimens,‟‟ ASTM International, 100Barr Harbor Drive, west Conshohocken, United States, 2014. [8] ASTM C496/C496M-11, „„Standard test method for splitting tensile strength of cylindrical concrete specimens,‟‟ ASTM International, 100Barr Harbor Drive, west Conshohocken, United States, 2011. [9] ASTM C 469/C469M-14, „„Standard test method for static modulus of elasticity and poisson's ratio of concrete in compression,‟‟ ASTM International, 100Barr Harbor Drive, west Conshohocken, United States, 2014. [10] N. J Pagano and P.C. Chou, “The importance of signs of shear stress and shear strain in composites,” Journal of Composite Materials, 1996. [11] G. Timoshenko, “Mechanics of materials,” 3rd edition, Ch.6, 1990. | ||
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