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بررسی تأثیر پلیمر تقویتشده با الیاف (FRP) بر ظرفیت تحمل تنش اتصال گوشهای فارسی تحت بارگذاری کشش قطری | ||
| تحقیقات علوم چوب و کاغذ ایران | ||
| مقاله 1، دوره 35، شماره 4 - شماره پیاپی 73، دی 1399، صفحه 307-320 اصل مقاله (852.55 K) | ||
| نوع مقاله: مقاله پژوهشی | ||
| شناسه دیجیتال (DOI): 10.22092/ijwpr.2020.343567.1623 | ||
| نویسندگان | ||
| پانته آ عمرانی* 1؛ حمیده عبدل زاده2؛ محسن عابدی3 | ||
| 1استادیار، گروه صنایع چوب، دانشکده مهندسی عمران، دانشگاه تربیت دبیر شهید رجایی، تهران، ایران. | ||
| 2فارغ التحصیل دکترای علوم و صنایع چوب و کاغذ، دانشکده منابع طبیعی، دانشگاه تهران، ایران. | ||
| 3دانشجوی کارشناسی ارشد، گروه صنایع چوب، دانشکده مهندسی عمران، دانشگاه تربیت دبر شهید رجایی، تهران، ایران | ||
| چکیده | ||
| پلیمرهای تقویتشده با الیاف (FRP) بهدلیل سهولت مصرف و ویژگیهای فیزیکی خاص آن یکی از روشهای متداول تقویت، تعمیر و بازسازی سازهها بهشمار میرود. ارزیابیهای مخرب و غیرمخرب برای بررسی ویژگیها و پایداری FRP در راستای درک شرایط ساختاری آنها مورد استفاده قرار میگیرد. این پروهش با هدف بررسی عملکرد سازهای اتصال گوشهای مقاومسازی شده با پلیمرهای تقویتشده با الیاف (FRP) تحت بارگذاری کشش قطری انجام شده است. اتصالهای ساختهشده از دو گونه چوبی راش (Fagus orientalis) و نراد (Abies alba)، با کامپوزیتهای تقویتشده با یک و دو لایه از الیاف کربن و شیشه مقاومسازی شده و مورد آزمون کشش قطری قرار گرفتند. اتصالهای گوشهای فارسی با پین چوبی و چسب پلیوینیل استات ساخته شدند. عمل لایهگذاری الیاف بهصورت دستی انجام شد. از رزین اپوکسی بهعنوان ماتریس پلیمری استفاده شد. نتایج نشان دادند که چوب راش در مقایسه با نراد و الیاف شیشه نسبت به الیاف کربن عملکرد بهتری داشتهاند. بررسی آزمونههای کشش قطری بعد از شکست نشان داد که استفاده از FRPها بر روی سطوح اتصالهای فارسی L شکل میتواند در برابر باز شدن اتصال تحت بار مقاومت کند، ولی با بالا رفتن بار و افزایش تغییر مکان عمودی، ضعف کلی چوب در کشش عمود بر الیاف و برش موازی الیاف در محل دوبلها بهدلیل وجود تمرکز تنش، باعث شکست چوب میشود. همچنین نتایج نشان داد که اتصال گوشهای فارسی ساختهشده با گونه راش و 2 لایه از الیاف شیشه، دارای بیشترین ظرفیت تحمل تنش میباشد. | ||
| کلیدواژهها | ||
| راش؛ نراد؛ پلیمرهای تقویتشده با الیاف؛ ظرفیت تحمل تنش؛ رزین اپوکسی؛ پلیوینیل استات | ||
| عنوان مقاله [English] | ||
| Investigation affect of fiber reinforced polymer (FRP) on stress carrying capacity of miter corner joint under diagonal tension loading | ||
| نویسندگان [English] | ||
| PANTEA OMRANI1؛ Hamideh Abdolzadeh2؛ Mohsen Abedi3 | ||
| 1Assistant Prof., Wood Science and Technology Department, The faculty of Civil Engineering, Shahid Rajaee Teacher Training University, Tehran, Iran. | ||
| 2PhD, Department of Wood Science & Technology, Faculty of Natural Resources, University of Tehran, Karaj, Iran. | ||
| 3M.Sc., Wood Science and Technology Department, The faculty of Civil Engineering, Shahid Rajaee Teacher Training University, Tehran, Iran. | ||
| چکیده [English] | ||
| Fiber Reinforced Polymer (FRP) has become one of the most popular methods in the reinforced, repair and rehabilitation of structure due to its ease of application and the special physical characteristics. Both destructive and nondestructive assessments have been used to test the characteristics and durability of FRP in order to investigate the condition of the structure. The aim of this research was to investigate the structural performance of corner joint reinforced with fiber reinforced polymer (FRP) composite under diagonal tension load. Constructed joints from two wooden species of beech (Fagus orientalis) and fir (Abies alba), were reinforced with reinforced composites of one and two layer of carbon and glass fibers and then they were tested under diagonal tension load. The miter corner joints were made with wooden pin and polyvinyl acetate adhesive. The fibers lay-up was done manually. Epoxy resin was used as a polymeric matrix. Result of investigation indicated that use of beech wood in comparison with fir exhibited better results. In addition, glass fibers have shown better performance than carbon fiber as reinforcing agents. Inspection of diagonal tension specimens after failure have indicated that using of FRPs on the surfaces of L-shaped miter prevent joint opening, however, failure was occurred at the joint by increasing of load and vertical displacement and the general wood weakness in tension perpendicular to the grain and shear parallel to the grain at dowels site due to stress concentration. Also the results showed that the miter corner joint made with beech species and two layers of glass fibers had the highest stress carrying capacity. | ||
| کلیدواژهها [English] | ||
| Beech, Fir, Fiber Reinforced Polymers, stress carrying capacity, epoxy resin, polyvinyl acetate | ||
| مراجع | ||
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-Abdolzadeh, H., Ebrahimi, Gh. and Layeghi, M., 2016. Structural performance of corner joint reinforced by FRP under diagonal tension loading. Iranian Journal of Wood and Paper Science Research, 31(1): 118-129. -Abdolzadeh, H., Layeghi, M., Ebrahimi, Gh. and Ghassemieh, M., 2017. Investigation on stress distribution at corner joints with wood polymer members using finite element method. Iranian Journal of Wood and Paper Industries, 8(3): 429-440. -Alam, P., Ansell, M.P. and Smedley D., 2009. Mechanical Repair of Timber Beams Fractured in Flexure Using Bonded-in Reinforcements. Composites, Part B: Engineering, 40: 95-106. -Beheshty, M.H. and Rezadoust, A.M., 2005. Reinforced Plastic Composites. Iran Polymer and Petrochemical Institute, 447: 69-75. -Buchelt, B., Dietrich, T. and Wagenfu¨hr,. A., 2012. Macroscopic and microscopic monitoring of swelling of beech wood after impregnation with furfuryl alcohol. European Journal of wood and Wood Product, 70(6): 865-869. -Custodio, J., Broughton, J. and Cruz, H., 2009. A Review of Factors Influencing the Durability of Structural Bonded Timber Joints, International Journal of Adhesion and Adhesives, 29: 173-185. -Dagher, H.J. and Lindyberg, R., 2000. FRP-wood hybrids for bridges: a comparison of E-glass and carbon reinforcements. Proceedings of ASCE conference, Philadelphia, USA, 7-10 March: 1-8. -Ebrahimi, G., 2007. Engineering design of furniture structure. Tehran university publication, Iran, 491p. -Eckelman, C. A., 2003. Textbook of product engineering and strength design of furniture. West Lafayette (IN): Purdue University Press. -Garcia, P.R., Escamilla, A.C. and Garcia, M.N.G., 2013. Bending reinforcement of timber beams with composite carbon fiber and basalt fiber materials. Composites: Part B: Engineering, 55: 528-536. -Gustafsson, P.J., 2003. Fracture perpendicular to grain - structural applications, in Timber engineering, S. landerson and H.J. Larsen, Editors, Wiley & Sons. -Haller, P., Birk, T., Offerman, P. and Cebulla, H., 2006. Fully Fashioned Biaxial Weft Knitted and Stitch Bonded Textile Reinforcements for Wood Connection. Composites, Part B: Engineering, 37: 278-285. -Hernandez, R., Davalos, J.F., Sonti, S.S., Kim, Y. and Moody, R.C., 1997. Strength and Stiffness of Reinforced Yellow-Poplar Glued-Laminated Beams. Research Paper, FPL–RP–554, Forest Products Laboratory, 28. -Humpreys, M.F., and Francey, K.L., 2004. An Investigation into the Rehabilitation of Timber Structures with Fibre Composite Materials, Conference Paper, Developments in Mechanics of structures and Materials, Queensland University of Technology, Australia. -Kaw, A.K., 2009. Mechanics of Composite Materials, Taylor and Francis, Florida, 457p. -Lashgari, A. and Sinambari, P., 2012. Bending strength of screwed T-typed furniture joints. Iranian Journal of Wood and Paper Science Research, 27(3): 536-544. -Madhoushi, M. and Ansell, M.P., 2008. Behaviour of Timber Connections Using Glued-in GFRP Rods under Fatigue Loading, Part II: Moment-Resisting Connections. Composites, Part B: Engineering, 39: 249-257. -Madhoushi, M., Sadatzadeh, S. and Ebrahimi, Gh., 2011. Reinforcement of Bolted Timber Joints Using GFRP Sheets in Poplar and Pine Woods. Iranian Journal of Polymer Science and Technology, 24(3): 171-179. -Omrani, P., Abdolzadeh, H., and Abedi, M., 2020a. Stress carrying capacity of miter joint reinforced with fiber reinforced polymer (FRP). Iranian Journal of Wood and Paper Science Research, 10.22092/IJWPR.2020.342848.1613. -Omrani, P., Abdolzadeh, H., and Adab A., 2020b. Investigation of withdrawal resistance of reinforced T-shaped joint with fiber reinforced composites. Iranian Journal of Wood and Paper Science Research, 10.22092/IJWPR.2020.342846.1612. -Omrani, P., Ebrahimi, Gh. and Kahvand, M., 2019. Investigating the stress carrying capacity of miter corner joints made with biscuit under diagonal tension and compression loading. Iranian Journal of Wood and Paper Industries, 10 (3): 323-336. -Raftery, G.M. and Harte, A.M., 2011. Low-grade Glued Laminate Timber Reinforced with FRP Plate. Composites, Part B: Engineering, 42: 724-735. -Raftery, G.M., Harte, A.M. and Rodd, P.D., 2009. Bonding of FRP Materials to Wood Using Thin Epoxy Glue lines, International Journal of Adhesion and Adhesives, 29: 580-588. -Rowlands, R.E., Van Deweghe, R.P., Laufenberg, T.L. and Krueger, G.P., 1986. Fiber-Reinforced Wood Composites. Wood Fiber Science, 18: 39-57. -Snow, M., A.A.Z. Chen, and Y.H. Chui., 2006. North American practices for connection in wood construction. Progress in Structural Engineering and Materials, 8(2): 39-48. -Soltis, A.L., Ross, R.J. and Windorski, D.F., 1998. Fiberglass-Reinforced Bolted Wood Connection. Forest Products Journal, 48: 63-67. -Tankut, A.N. and Tankut, N., 2004. Effect of some factors on the strength of furniture corner joints constructed with wood biscuits. Turkish Journal of Agriculture and Forestry, 28: 301-309. -Varasteh-Poor, H., 2008. Application of Advanced Composites in Constructions, Ministry of Energy, Iran, 87. -Williamson, TG (ed). 2002. APA Engineered wood handbook. McGraw-Hill, New York.
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