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Ç¥ÁØÈÀç¿¡ ³ëÃâµÈ CFRP º¸°±Ù º¸° ºÎºÐ¸ÅÀÔÇüÇÕ¼ºº¸ÀÇ ÈÚ¼º´É / Flexural Performance of Partially Encased Composite Beam Reinforced CFRP Re-bar Exposed to Standard Fire |
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º¹ÇսżÒÀ籸Á¶ÇÐȸ ³í¹®Áý, Vol.15 No.05 (2024-10) |
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½ÃÀÛÆäÀÌÁö(24) ÃÑÆäÀÌÁö(10) |
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ź¼Ò¼¶À¯º¸°±Ù; »ÕÄ¥³»ÈÇǺ¹Àç; ºÎºÐ¸ÅÀÔÇüÇÕ¼ºº¸; ÈÚ¼º´É; Ç¥ÁØÈÀç°î¼± ; carbon fiber reinforced plastic; spray-applied fire resistive material; standard fire curve; flexural performance |
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°ÇÃ๰ÀÇ ´ë°ø°£ ¹× °íÃþÈ¿¡ ´ëÇÑ ¿ä±¸°¡ Áõ°¡ÇÔ¿¡ µû¶ó ºÎºÐ¸ÅÀÔÇüÇÕ¼ºº¸ÀÇ ¿¬±¸°¡ ÁøÇàµÇ°í ÀÖ´Ù. ºÎºÐ¸ÅÀÔÇüÇÕ¼ºº¸´Â ÈÚ¼º´ÉÀ» Áõ´ë½ÃÅ°±â À§ÇØ ³»ºÎ¿¡ ö±ÙÀ» º¸°ÇÏ¿© ½Ã°øÇÑ´Ù. À̴ ö±ÙÀÇ ºÎ½ÄÀ¸·Î ±¸Á¶¹°ÀÇ ³»·Â ÀúÇϸ¦ À¯¹ßÇÑ´Ù. À̸¦ º¸¿ÏÇÏ°íÀÚ ³»ºÎ½Ä¼ºÀÌ ¿ì¼öÇÏ°í °í°µµÀÎ CFRP º¸°±Ù¿¡ ´ëÇÑ ¿¬±¸°¡ ÁøÇà ÁßÀÌ´Ù. ÇÏÁö¸¸ CFRP º¸°±ÙÀº ÀÓ°è¿Âµµ°¡ 250¡É·Î ³·±â ¶§¹®¿¡ ÀûÀýÇÑ ³»ÈÇǺ¹°ú ö±Ù·®ÀÌ ÇÊ¿äÇÏ´Ù. µû¶ó¼ ÇϺÎö±ÙÀÇ Á¾·ù¿Í SFRM µÎ²²¸¦ º¯¼ö·Î Ç¥ÁØÈÀç¿¡ ³ëÃâµÈ ºÎºÐ¸ÅÀÔÇüÇÕ¼ºº¸ÀÇ ¿Àü´Þ Çؼ®À» ¼öÇàÇÏ¿´°í ÈÀç¿¡ ÀÇÇÑ Àú°¨°è¼ö¸¦ °í·ÁÇÏ¿© ÈÚ³»·ÂÀ» »êÁ¤ÇÏ¿´´Ù. ¶ÇÇÑ, ¿Àü´ÞÇؼ®°ú µ¿ÀÏÇÑ »çÀÌÁîÀÇ ½ÇÇèü¸¦ ÅëÇØ ºñÀçÇϼöÆò°¡¿·Î ½ÇÇèÀ» ÁøÇàÇÏ¿© ¿Àü´Þ Çؼ® °á°ú¿Í ºñ±³ ºÐ¼®ÇÏ¿´´Ù. Çؼ® °á°ú SFRM 30 mm Àû¿ë ½Ã 1½Ã°£ÀÇ ³»È¼º´ÉÀ» È®º¸ÇÒ ¼öÀÖ´Ù. ¶ÇÇÑ, ÈÀç ½Ã ÇÏÁß Á¶ÇÕ¿¡ ÀÇÇÑ ³»È¼º´É Æò°¡ ½Ã, ¹«ÇǺ¹ÀÓ¿¡µµ 2½Ã°£ÀÇ ³»È¼º´ÉÀ» °¡Áö´Â °ÍÀ¸·Î Æò°¡µÇ¾ú´Ù. |
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As the demand for large open spaces and high-rise buildings grows, research on partially encased composite beams has gained momentum. These beams are typically reinforced with steel rebar to enhance their flexural performance; however, this reinforcement can lead to reduced structural capacity due to rebar corrosion. To mitigate this issue, studies have focused on using carbon fiber reinforced polymer (CFRP) rebar, known for its high corrosion resistance and strength. Despite these advantages, CFRP rebar has a low critical temperature of 250¡ÆC, necessitating proper fireproof coatings and careful consideration of rebar quantity. This study conducted a thermal transfer analysis of partially encased composite beams exposed to standard fire conditions, with the type of bottom rebar and the thickness of spray-applied fire-resistive material (SFRM) as variables. Flexural strength calculations were performed, incorporating the reduction factor due to fire exposure. Additionally, non-load-bearing fire tests were conducted on specimens of the same dimensions as those used in the thermal transfer analysis, and the outcomes were compared and analyzed. The results demonstrated that a 30 mm thickness of SFRM provides 1-hour fire resistance. Moreover, when evaluating fire resistance under combined loading conditions during a fire, it was found that the structure could sustain 2-hour fire resistance even without fireproof coating. |