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Architecture & Urban Research Institute

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³í¹®¸í È­Àç¼Õ»óÀ» ÀÔÀº ö±ÙÄÜÅ©¸®Æ® º¸¿¡¼­ ¿ÜÀû Æ÷½ºÆ®ÅÙ¼Å´× °­ºÀÀÇ Àü´Ü º¸°­ / Shear Strengthening by Externally Post-tensioning Steel Rod in Fire-Damaged Reinforced Concrete (RC) Beam
ÀúÀÚ¸í À̼öÇå(Lee, Swoo-Heon)
¹ßÇà»ç ´ëÇѰÇÃàÇÐȸ
¼ö·Ï»çÇ× ´ëÇѰÇÃàÇÐȸ³í¹®Áý, Vol.39 No.1 (2023-01)
ÆäÀÌÁö ½ÃÀÛÆäÀÌÁö(257) ÃÑÆäÀÌÁö(9)
ISSN 2733-6247
ÁÖÁ¦ºÐ·ù ±¸Á¶ / Àç·á
ÁÖÁ¦¾î È­Àç¼Õ»ó; ö±ÙÄÜÅ©¸®Æ®; ¿ÜÀû Æ÷½ºÆ®ÅټŴ×; °­ºÀ; º¸°­ ; Fire-damaged; Reinforced Concrete (RC); Externally Post-tensioning; Steel Rod; Strengthening
¿ä¾à1 ÀÌ ¿¬±¸´Â È­Àç¼Õ»óÀ» ÀÔÀº ö±ÙÄÜÅ©¸®Æ® º¸¿¡ ¿ÜÀû Æ÷½ºÆ®ÅÙ¼Å´× °­ºÀÀ» Àû¿ëÇÏ¿´À» ¶§ Àû¿ë °¡´É¼º°ú º¸°­ È¿°ú, °³¼±Á¡ µîÀ» ³íÇÑ´Ù. ÃÑ 12°³ÀÇ ½ÇÇèü°¡ 3°³ÀÇ ½ÇÇ豺À¸·Î ±¸¼ºµÇ¾ú°í ÆÄ±« ½Ã±îÁö ½ÇÇèÇÏ¿´´Ù. ½ÇÇ豺 #1Àº °í¿Â¿¡ ³ëÃâÇÏÁö ¾Ê¾Ò°í, ½ÇÇ豺 #2¿Í #3Àº °¢°¢ 700¡É, 1,000¡É¿¡ ³ëÃâÇÏ¿´´Ù. °¢ ½ÇÇ豺Àº Æ÷½ºÆ®ÅÙ¼Å´× °­ºÀÀ¸·Î º¸°­ÇÏÁö ¾ÊÀº ±âº» ½ÇÇèü 1°³, 18mm, 22mm, 28mm °­ºÀÀ¸·Î º¸°­ÇÑ 3°³ÀÇ ½ÇÇèü·Î µðÀÚÀεǾú´Ù. °­ºÀ¿¡´Â Ãʱ⠱äÀå·Â ¾à 2000¥ì¥åÀÌ µµÀԵǾú´Ù. ½ÇÇè°á°ú¸¦ º¸¸é, Æ÷½ºÆ®ÅÙ¼Å´× °­ºÀ º¸°­¹ýÀº 67% ÀÌ»óÀÇ °­µµ º¸°­ È¿°ú¸¦ º¸¿´±â ¶§¹®¿¡ ±× º¸°­ È¿°ú¸¦ ÀÔÁõÇÏ¿´´Ù. ÇÏÁö¸¸ °í¿Â¿¡ ÄÜÅ©¸®Æ® Ç¥¸éÀÇ ¼Õ»óÀÌ ¹ß»ýÇÏ¿´±â¿¡ µ¥ºñ¿¡ÀÌÅÍ¿Í Á¤Âø±¸ ºÎ±Ù¿¡´Â Ãß°¡ º¸°­ÀÌ ÀÌ·ç¾îÁ®¾ß ÇÒ °ÍÀ¸·Î ÆÇ´ÜÇÑ´Ù.
¿ä¾à2 The purpose of this study is to discuss the applicability, strengthening effect and improvements when an externally post-tensioned steel rod
system is applied to a fire-damaged reinforced concrete (RC) beam. A total of twelve specimens were prepared in three groups and tested to
fail. Group one was not heated, and group two and group three were heated to 700¡É and 1,000¡É, respectively. In each group, one beam
without externally post-tensioned steel rods was designated as a control beam and three beams had the externally post-tensioned steel rods of
18 mm, 22 mm or 28 mm in diameter. The initial effective tension of about 2,000?? was applied to the steel rods. Test results indicated that
this can be applied to fire-damaged RC because externally post-tensioning increased the load-carrying capacity by more than 67%. However,
additional reinforcement is required in the part where the deviator and anchorage are installed since the concrete surface is weakened by
moisture evaporation at high temperatures.
¼ÒÀåó ´ëÇѰÇÃàÇÐȸ
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DOI https://doi.org/10.5659/JAIK.2023.39.1.253
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