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Çѱ¹Áö¹Ý°øÇÐȸ / v.26, no.1, 2010³â, pp.45-54
»çÁúÅä Áö¹Ý¿¡ ³õÀÎ ÁöÁøÇÏÁßÀ» ¹Þ´Â ¸»¶Ò ±âÃÊ ½Ã½ºÅÛÀÇ °íÀ¯ Áøµ¿¼ö ¿¹Ãø
( Prediction of the Natural Frequency of Pile Foundation System in Sand during Earthquake )
¾çÀDZÔ;±Ç¼±¿ë;ÃÖÁ¤ÀÎ;±è¸í¸ð; ¼­¿ï´ëÇб³ °øÇבּ¸¼Ò;¼­¿ï´ëÇб³ °Ç¼³È¯°æ°øÇкÎ;¼­¿ï´ëÇб³ °Ç¼³È¯°æ°øÇкÎ;¼­¿ï´ëÇб³ °Ç¼³È¯°æ°øÇкÎ;
 
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¸»¶Ò ±¸Á¶¹°ÀÇ µ¿Àû °Åµ¿À» ºÐ¼®Çϰí ÁöÁøÆÄ¿¡ ´ëÇÑ °øÁø ¾ÈÁ¤¼ºÀ» È®º¸Çϱâ À§Çؼ­´Â °íÀ¯ Áøµ¿¼ö¸¦ ÇÕ¸®ÀûÀ¸·Î »êÁ¤ÇÏ´Â °ÍÀÌ Áß¿äÇÏ´Ù. º» ¿¬±¸¿¡¼­´Â °£´ÜÇÑ Áú·® - ½ºÇÁ¸µ ¸ðµ¨À» ÀÌ¿ëÇÏ¿© ÁöÁø ÇÏÁßÀ» ¹Þ´Â ¸»¶Ò ±¸Á¶¹°ÀÇ °íÀ¯ Áøµ¿¼ö¸¦ °£ÆíÇϸ鼭µµ È¿À²ÀûÀ¸·Î ¿¹ÃøÇÒ ¼ö ÀÖ´Â ¹æ¹ýÀ» ¸ð»öÇÏ¿´´Ù. °íÀ¯Áøµ¿¼ö »êÁ¤ °á°ú¿¡ Å« ¿µÇâÀ» ¹ÌÄ¡´Â Áö¹Ý-¸»¶Ò °£ ½ºÇÁ¸µ °­¼ºÀ» Áö¹Ý¹Ý·Â»ó¼ö¿Í p-y °î¼± ±×¸®°í Áö¹Ý ź¼º°è¼ö µîÀ» ÀÌ¿ëÇÏ¿© °áÁ¤Çϰí, À̵éÀ» ÀÌ¿ëÇÏ¿© °è»êÇÑ °íÀ¯Áøµ¿¼ö¸¦ 1g Áøµ¿´ë ½ÇÇè¿¡¼­ °èÃøÇÑ °íÀ¯Áøµ¿¼ö¿Í ºñ±³ÇÑ °á°ú, Áö¹Ý¹Ý·Â»ó¼ö¸¦ ÀÌ¿ëÇÑ Reese(1974) ¹æ¹ý°ú µ¿Àû p-y ÁßÃß °î¼±À» ÀÌ¿ëÇÑ Yang(2009)ÀÇ ¹æ¹ýÀ» ÀÌ¿ëÇÏ¿© ½ºÇÁ¸µ °­¼ºÀ» »êÁ¤ÇÏ´Â °ÍÀÌ °¡Àå ¿ì¼öÇÑ °á°ú¸¦ ³ªÅ¸³»¾ú´Âµ¥, °ÇÁ¶Åä¿¡ À§Ä¡ÇÑ ¸»¶Ò±¸Á¶¹°¿¡¼­´Â 5% À̳»ÀÇ ¿ÀÂ÷¸¦ º¸¿´À¸¸ç, Æ÷È­Åä¿¡ À§Ä¡ÇÑ ¸»¶Ò ±¸Á¶¹°ÀÇ °æ¿ì¿¡´Â Áøµ¿ Áß¿¡ °úÀ×°£±Ø¼ö¾ÐÀÇ ¹ß»ý¿©ºÎ¿¡ µû¶ó 5%¿¡¼­ 40% »çÀÌÀÇ ¿ÀÂ÷¸¦ ³ªÅ¸³»¾ú´Ù.
It is important to calculate the natural frequency of a piled structure in the design stage in order to prevent resonance-induced damage to the pile foundation and analyze the dynamic behavior of the piled structure during an earthquake. In this paper, a simple but relatively accurate method employing a mass-spring model is presented for the evaluation of the natural frequency of a pile-soil system. Greatly influencing the calculation of the natural frequency of a piled structure, the spring stiffness between a pile and soil was evaluated by using the coefficient of subgrade reaction, the p-y curve, and the subsoil elastic modulus. The resulting natural frequencies were compared with those of 1-g shaking table tests. The comparison showed that the natural frequency of the pile-soil system could be most accurately calculated by constructing a stiffness matrix with the spring stiffness of the Reese (1974) method, which utilizes the coefficient of the subgrade reaction modulus, and Yang's (2009) dynamic p-y backbone curve method. The calculated natural frequencies were within 5% error compared with those of the shaking table tests for the pile system in dry dense sand deposits and 5% to 40% error for the pile system in saturated sand deposits depending on the occurrence of excess pore water pressure in the soil.
 
Ű¿öµå
1-g shaking table tests;Mass-spring model;Natural frequency;Pile-soil system;Spring coefficient;
 
Çѱ¹Áö¹Ý°øÇÐȸ³í¹®Áý / v.26, no.1, 2010³â, pp.45-54
Çѱ¹Áö¹Ý°øÇÐȸ
ISSN : 1229-2427
UCI : G100:I100-KOI(KISTI1.1003/JNL.JAKO201015939077229)
¾ð¾î : Çѱ¹¾î
³í¹® Á¦°ø : KISTI Çѱ¹°úÇбâ¼úÁ¤º¸¿¬±¸¿ø
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