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IRJET- Effect of Web Openings of Constant Area in Beams of Different Shape in Plan
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IRJET- Effect of Web Openings of Constant Area in Beams of Different Shape in Plan
1.
International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 06 Issue: 08 | Aug 2019 www.irjet.net p-ISSN: 2395-0072 © 2019, IRJET | Impact Factor value: 7.34 | ISO 9001:2008 Certified Journal | Page 1319 EFFECT OF WEB OPENINGS OF CONSTANT AREA IN BEAMS OF DIFFERENT SHAPE IN PLAN SANJEEV JADHAV1, Prof. VAHINI M2 1P.G. Student, Dept. of Civil Engineering, Govt. Engineering College, Devagiri, Haveri, Karnataka, India_581110 2Asst. Professor, Dept. of Civil Engineering, Govt. Engineering College, Devagiri, Haveri, Karnataka, India_581110 ---------------------------------------------------------------------***---------------------------------------------------------------------- Abstract – A Reinforced concrete beam with transverse web opening is a facility that allows the services such as telephone lines, air conditioning and ventilating ducts, to pass through the structure. Because of the change in the beam section the corners of the opening are subjected to large concentration of stress, possibly producing oblique cracks in the beam. The regions nearby the openings are measured as the weaker part of the beam. Therefore, a declineinbearingcapabilityandalso a change in the load transfer mechanism is experienced. Analytical study is carried out by using ANSYS 16.2. An attempt is made to analyse three beams of 3m span, with different shapes in plan such as curved (semicircular), half- hexagonal, straight beams withandwithoutwebopeningslike circular, rectangular and square openings of constant area. Beams are analyzed for with and without CFRP wrapping. Provision of CFRP wrapping reduces by 9 to 14% for deformation, stress and resultant reactions in all types of beams. Key Words: Circular beam, half-Hexagonal beam, Straight beam, Circular opening, Rectangular opening, square openings, CFRP wrapping, CATIA, ANSYS. 1. INTRODUCTION Nowadays the RC beam structures are constructed with web openings commonly used for passing of pipes and ducts. These web openings contain mainly building services such as water supplying, electricity; air congaing; Computer & Telecommunication network lines. The presence of an opening in the web of a RC beam leads to various troubles in the behavior of beam, like decrease the rigidity (stiffness) of beams, unnecessary cracking, unnecessary deformations and decrease in the beam strength. Also rapid change in the dimension of cross section of the beam leads to high stress focus at the corner's of opening. That possibly will direct to cracking, unacceptable from visual and durability viewpoints. The reduced rigidity of the beam may also give increase to unnecessary deflection under service load and result in a considerable redistribution of internal forces and moments in a continuous beam. Concrete is a brittle material so, number of methods are used to make stronger the structural elements. They consist of surface laminates or wrapping of fiber reinforced polymers in addition to make stronger with a variety of fibrous materials. The FRP materials are light in weight. It gives the excellent mechanical strength and being good resistant to the corrosive nature of aggressive environment under wide range of temperature. FRP is fine replacement for steel reinforcement in reinforced concrete structure. The openings are classified based on their dimension and positions. Web openings have been established in different shapes, for example rectangular, square, circular, hexagonal, elliptical and irregular shapes. Circular, square and rectangular type of openings is generally used. If the opening dia is 1/4th of the web depth, that considered as large opening. 1.1 Types of Beam and their openings Consideredin this Project A. Straight beam Straight beam carries only bending moment and shear force. Some examples of straight beams are ceiling beams, entrance of buildings, hidden or merged beams Fig -1: Water pipe passing through straight beam B. Curved beam A beam in which the neutral axis in the unloaded condition in curved instead of straight beamorIfthebeamis originally curved before applying the bending moment are termed as curved beam. A horizontally curved beamsloaded transversely to its plane is subjected to torsioninaddition to bending and shear. Its C.G always fallows a certain curve i.e. axis and the plane of figure is normal to the curve. The curved beam can be an arch but an arch is not necessarily made from a curved beam. A few examples of curved beams uses for; circular water tanks, circular ceiling, balconies,
2.
International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 06 Issue: 08 | Aug 2019 www.irjet.net p-ISSN: 2395-0072 © 2019, IRJET | Impact Factor value: 7.34 | ISO 9001:2008 Certified Journal | Page 1320 entrance of public buildings, windows,bridgedecks,interior of homes and external decorative purpose Fig -2: Curved beam of a building under construction C. Half Hexagonal beam These beams are geometrically half hexagonal in shape. These beams are used for a few of the fallowing examples, entrance of buildings, watching towers, windows sill, interior of homes and external decorative purpose Fig -3: Watch towers in hexagonal beams shape 2. OBJECTIVES 1. To study the behavior of straight beam, semicircular beam and half hexagonal shaped beam without openings. 2. To study the behavior of straight beam, semicircular beam and half hexagonal shaped beam with circular, square and rectangular openings for constant area. 3. To study the effect of strengthening of opening with CFRP laminates for different beams. 3. METHODOLOGY 3.1 Dimensional Details of Beams In this work, three different shapes of beams in plan are used. All are having a span of 3m and constant cross sectional area of 120x230 i.e., 27600 mm2 and subjected to concentrated load of 10kN each at 750mm from the support and application of load is above the webopenings.Bearing of 120x50x8 is provided at each side of support section and same sized two steel plates are used to applying the load. 3.2 Cross Section of Beams Beams are having constant cross sectional area. A Concrete beams of 120x230 i.e., 27600 mm2, And beam with 2mm thick CFRP wrapping is provided at opening zone on top surface of the beam up to 500mm in length.Area ofCFRP is 1416mm2 used. Fig -4: Cross section of concrete beams 3.3 Curved Beam (Semi-Circular) Fig -5: Curved beam in plan 3.4 Straight Beam Fig -6: Straight beam in plan
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International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 06 Issue: 08 | Aug 2019 www.irjet.net p-ISSN: 2395-0072 © 2019, IRJET | Impact Factor value: 7.34 | ISO 9001:2008 Certified Journal | Page 1321 3.5 Half Hexagonal Beam Fig.7: Half-hexagonal beam in plan 3.6 Sizes of different web openings for constant area of opening A. Circular opening B. Rectangular opening C. Square opening The openings are provided in the center of beam web for constant area, 10000mm2 web opening is provided. 3.7 Modeling by CATIA All shape of beams are modeled by using CATIA and analysed by ANSYS forward. A. Curved Beam Models by CATIA Fig -8: Curved beam with circular web opening B. Half hexagonal Beam Models by CATIA Fig -9: Half-hexagonal beam with circular web opening C. Straight Beam Models by CATIA Fig -10: Straight beam with circular web opening 3.8 Material properties A. Concrete For concrete isotropic materials was used as fallow, M-25 Concrete is considered Density is 2400 kg/m3 Young’s modulus is 25x103 MPa Poisson’s ratio is 0.18. B. CFRP wrapping For CFRP orthotropic elasticity was used and it is a good strengthening material. In this study, 2mm thick CFRP wrapping at opening zone is provided. Properties of CFRP wrapping materials are in Table -1. Table -1: Properties of CFRP
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International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 06 Issue: 08 | Aug 2019 www.irjet.net p-ISSN: 2395-0072 © 2019, IRJET | Impact Factor value: 7.34 | ISO 9001:2008 Certified Journal | Page 1322 3.9 Meshing Properties Considered The meshing used is tetrahedron of 25mm element size. 3.10 Analysis Analysis of beams is carried out by ANSYS 16.2 software. All beams are analyzed and solutions are obtained for the fallowing, A. Total Deformation in mm B. Equivalent (Von-Mises) stress in Mpa C. Forced Reactions at each support ends of beams in kN Fig -11: Deformation of Concrete curved beam for constant area of circular web opening Fig -12: Deformation of Concrete curved beam for constant area of circular web opening with wrapping Fig -13: Deformation in curved beam for constant area of different web openings with and without wrapping Fig -14: Deformation of Concrete half hexagonal beam for constant area of circular web opening Fig -15: Deformation of Concrete half hexagonal beam for constant area of circular web opening with wrapping Fig -16: Effect of deformation in half hexagonal beam for constant area of different web openings with and without wrapping Fig -17: Deformation of concrete straight beam for constant area of circular web opening
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International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 06 Issue: 08 | Aug 2019 www.irjet.net p-ISSN: 2395-0072 © 2019, IRJET | Impact Factor value: 7.34 | ISO 9001:2008 Certified Journal | Page 1323 Fig -18: Deformation of concrete straight beam for constant area of circular web opening with wrapping Fig -19: Deformation in straight beam for constant area of different web openings with and without wrapping Increase in deformation with the provision of web openings is negligible for constant area of openings in all shape of beams. Deformation reduces by providing CFRP wrapping. Deformation reduces by 12.34% to 14.48% by providing CFRP wrapping for all type of web openings of constant area in curved beam. Deformation reduces by 9.14% to 9.34% by providing CFRP wrapping at opening zone for all type of web openings of constant area in half hexagonal beam. Deformation reduces by 9.96% to 12.00% for constant area by providing CFRP wrapping at opening zone for all type of web openings in straight beam. Fig-20: Stress for Concrete curved beam for constant area of circular web opening Fig-21: Stress for concrete curved beam for constant area of circular web opening with wrapping Fig -22: Stress in curved beam for constant area of different web openings with and without wrapping Fig -23: Stress for Concrete half hexagonal beam for constant area of circular web opening
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International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 06 Issue: 08 | Aug 2019 www.irjet.net p-ISSN: 2395-0072 © 2019, IRJET | Impact Factor value: 7.34 | ISO 9001:2008 Certified Journal | Page 1324 Fig -24: Stress for Concrete half hexagonal beam constant area of circular web opening with wrapping Fig -25: Stress in half hexagonal beam for constant area of different web openings with and without wrapping Fig -26: Stress for concrete straight beam for constant area of circular web opening Fig -27: Stress for concrete straight beam for constant area of circular web opening and with wrapping Fig -28: Stress in straight beam for constant area of different web openings with and without wrapping Maximum stress is observed in square and rectangular opening for without wrapping beam in all shape of beams. Due to provision of openings inconcretebeamstress will increase by 10.50% for constant area of web openings compared to without openings in curved beam. Due to provision of opening in concrete beam stress will increase by 5.50-6.95% for constant depth of web openings compared to without openings in straight beam. Stress reduces with the provision of CFRPwrapping. Stress reduces by 12.27 to 14.64% for constant area of web openings by the introduction of wrapping at opening zone in curved beam. Stress reduces by 8.57 to 8.72% for constant area of web openings by the introduction of wrapping at opening zone in half hexagonal beam. Stress reduces by 10.46 to 12.72% for constant area of web openings by the introducing of wrapping at opening zone in straight beam. Minimum stress is observed for curved beam, half hexagonal beam andstraight beamwithcircularweb opening with CFRP wrapping than other openings. Fig -29: Resultant forced reaction for curved beam
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International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 06 Issue: 08 | Aug 2019 www.irjet.net p-ISSN: 2395-0072 © 2019, IRJET | Impact Factor value: 7.34 | ISO 9001:2008 Certified Journal | Page 1325 Fig -30: Total resultant forced reaction in curved beam for constant area of different web openings with and without wrapping Fig -31: Resultant forced reaction for half hexagonal beam Fig -32: Total resultant forced reaction in half hexagonal beam for constant area of different web openings with and without wrapping Due to provision of opening in concrete beam total resultant reactions will increase by 6 to 7.78% for constant area of web openings compared to without openings in curved beam. Resultant forced reactions decrease by providing CFRP wrapping at opening zone for all types of web openings. A reduction of 11.88 to 13.48% forced reaction for constant area of web openings due to CFRP wrapping in curved beam. Maximum resultant forced reactions in half hexagonal beam with circular web opening are observed for constant area of opening in half hexagonal beam. A reduction of 9.06 to 9.24% forced reaction for constant area of web openings due to CFRP wrapping in half hexagonal beam. Straight beam shows almost same resultant reactions for with and without openings and wrappings. No variations are observed in this type of straight beam. 4. CONCLUSIONS In this study attempt has been to check the behavior of different shapes of beams in plan such as curved beam, half hexagonal beam, and straight beam with different openings such as circular, square, and rectangular opening. The static analysis is carried out by ANSYS. Totally 18 models are analyzed. The analysis results are tabulated and compared i.e., 12 models each in 3 different shape of beams with and without opening and external surface wrapping at opening zone. i. Increases in deformation with the provision of web openings web openings are negligible for constant areas of openings in all type of beams. ii. Deformation reduces by providing CFRP wrapping for both constant area of opening in all the types of beams. iii. 9 to 14% deformations are reduces by providing CFRP wrapping. iv. Stress increases with the provision ofwebopeningsfor constant area of opening in all the types of beams. v. CFRP wrapping reduces stress in all beams of web openings with constant area. vi. 8 to 14% stress are reduces by providing CFRP wrapping. vii. Resultant reactions increase in curved beam whereas for half hexagonal beam resultant reactions reduce by providing web openings. viii. A resultant reaction reduces by providing CFRP wrapping in all types of beams. ix. 9 to 14% resultant reactions are reduced by providing CFRP wrapping.
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International Research Journal
of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 06 Issue: 08 | Aug 2019 www.irjet.net p-ISSN: 2395-0072 © 2019, IRJET | Impact Factor value: 7.34 | ISO 9001:2008 Certified Journal | Page 1326 ACKNOWLEDGEMENT I am thankful to my guide, Asst. Professor. Vahini M in Civil Engineering Departmentforherregularencouragement and able guidance, also I thank my parents, friends etc. for their continuous support in making this work complete. My sincere thanks are extended to all staff of Government Engineering College, Haveri Teachers of the Department of Civil Engineering and to all my friends and my parents for their helpand supported a lotin successful completion ofthe M. Tech dissertation work. REFERENCES [1] Athira Boselal, and Archana Sukumaran, “Semicircular Curved Beam Opening Strengthened by Various Laminates”, International Journal of EngineeringResearch&Technology,Vol.-06andpp: 1-04, 2018. [2] Bhavikatti S.S., “Strength of material” 4th Ed, Vikas Publication House Pvt. Ltd. Jangpura, New Delhi- 110 014, [3] Chin S.C., Shafiq N., and Nuruddin M.F., “Strengthening of RC Beams with Large Openingsin Shear by CFRP Laminates: 2D Nonlinear FE Analysis”, International Journal of Civil and Environmental Engineering, Vol: 6, pp: 153-158, 2012. [4] Luay Mohammed Shather, Salam Naji Hussein, and Laith Falah Hasan, “Theoretical Evaluation Of RC Deep Beam With Web Opening By Using Nonlinear Finite Element Software”, International Journal of Scientific & Engineering Research, Vol. 09, pp: 413- 421, May 2018. [5] Rajendra Prasad D.S, “Structural analysis-I”, 1st Ed, Published By Supna Book House Pvt. Ltd. Gandhinagar Bangalore-560 009, Sept-2012. [6] Saeed Ahmed Al-Sheikh, “Flexural Behavior of RC Beams With Opening”, Concrete Research Letters, Vol. 5, June-2014, and pp: 812-824, Jun 2014. [7] Subhajit Mondal, Bandyapadhya J.N. and Chandra Pal Gautam,“Strengthening and Rehabilitati on of Reinforced Concrete Beams with Opening”, International Journal of Civil and Structural Enginee ring, Vol. 02, and pp: 127-137, 2011. [8] Swathy S. Pillai, and Alice Johny, “Analytical Study on Shear Behavior of Reinforced Concrete Beam with Varying Shapes ofWebOpening”, International Journal of Engineering Research & Technology, Vol. 06, and pp: 01-04, 2018. [9] IS: 456, “Code of practice for plain and reinforced concrete”. Bureau of Indian Standards: New Delhi; 2000.
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