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Çѱ¹Áö¹Ý°øÇÐȸ / v.16, no.1, 2000³â, pp.107-116
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( The Behavior of Bearing Capacity for the Precast files )
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4°³ ÇöÀå¿¡ ½Ç¹°Å©±âÀÇ °­°ü¸»¶Ò°ú PC ¹× PHC ¸»¶ÒÀÇ Ãà¹æÇâ¿¡ ´ëÇÑ ÁöÁö°Åµ¿À» ¾Ë¾Æº¸±â À§ÇÏ¿©, °­°ü¸»¶Ò¿¡ ½ºÆ®·¹ÀΰÔÀÌÁö¸¦ ºÎÂøÇϰí Çן½Ã °èÃø±â ¼Õ»ó¿©ºÎ¸¦ Á¶»çÇϸ鼭 µ¿ÀçÇϽÃÇèÀ» ¼öÇàÇÏ¿´´Ù. ¾Æ¿ï·¯ µ¿ÀÏÇÑ ¸»¶Ò¿¡ ´ëÇÏ¿© 2Àϰú 7ÀÏ °æ°úÈÄ¿¡ Á¤ÀçÇϽÃÇèÀ» ½Ç½ÃÇÏ¿© ÇÏÁß-ħÇÏ·® °Åµ¿°ú ÁÖ¸é ¹× ¼±´ÜÁöÁö·ÂÀ» ºÐ¸® ÃøÁ¤ÇÏ¿´´Ù. ±× °á°ú, CAPWAP ÇØ¼®¿¡ Davisson¹æ¹ýÀ» Àû¿ëÇÏ¿© ±¸ÇÑ °­°ü¸»¶ÒÀÇ Çã¿ëÁöÁö·ÂÀº Á¤ÀçÇϽÃÇè¿¡¼­ ±¸ÇÑ Çã¿ëÁöÁö·Â º¸´Ù ¾à 2~33%Á¤µµ Å©°Ô ³ªÅ¸³µ´Ù. ±×¸®°í Á¤ÀçÇϽÃÇè °á°ú¿¡¼­ ±¸ÇÑ »ê¼úÆò±ÕÇÑ Çã¿ëÁöÁö·ÂÀº CAPWAPÇØ¼®¿¡¼­ Davisson's offset¹æ¹ýÀ¸·Î ±¸ÇÑ Çã¿ëÁöÁö·Âº¸´Ù ±ØÇÑÁöÁö·Â¿¡ FS=2.5¸¦ Àû¿ëÇÏ¿© ±¸ÇÑ Çã¿ëÁöÁö·Â¿¡ ´õ ±ÙÁ¢ÇÏ´Â °æÇâÀ» º¸¿´´Ù. ¶ÇÇÑ, ´ÜÀ§¸éÀû´ç ÁÖ¸éÁöÁö·ÂÀº ±íÀ̰¡ Áõ°¡ÇÔ¿¡ µû¶ó Áõ°¡ÇÏ¿´°í, ¸»¶Ò¼±´ÜºÎ 1~2m À̳»¿¡¼­ ¹ßÈֵǴ ºñÀ²ÀÌ »ó´çÈ÷ Å« °ÍÀ¸·Î ³ªÅ¸³µ´Ù.
Dynamic and static load tests are conducted in four construction sites by using steel pipe piles(SPP) and concrete piles to compare differences of load bearing mechanism. Steel pipe piles are instrumented with electric strain gages and are subject to dynamic load tests during driving. The damage of strain gages attached is checked simultaneously. Static load test is also conducted on the same piles after two to seven days' elapse. Then load-settlement behavior and shaft and/or tip resistances are measured. As a result, the allowable bearing capacity calculated by the Davisson's offset method of CAPWAP analysis shows 2~33% larger than that of static load test. The average value of allowable bearing capacity of static load test is closer to the allowable capacity obtained at the safety factor of 2.5 applied on ultimate bearing capacity than to the one obtained from the Davisson's offset method. The analysis of strain gage readings shows that unit skin friction increases with depth. Furthermore, the friction mobilized around the 1~2m above the pile tip considerably contributes to the total shaft resistance.
 
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Load bearing mechanism;CAPWAP analysis;Static load test;Instrumented pile;
 
Çѱ¹Áö¹Ý°øÇÐȸ³í¹®Áý / v.16, no.1, 2000³â, pp.107-116
Çѱ¹Áö¹Ý°øÇÐȸ
ISSN : 1229-2427
UCI : G100:I100-KOI(KISTI1.1003/JNL.JAKO200011921750083)
¾ð¾î : Çѱ¹¾î
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