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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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