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½½·¡ºê °¼º ¹× °æ°èÁ¶°ÇÀ» °í·ÁÇÑ ÀÛÀº º¸ÀÇ ÇÏÁß ºÐ¹è / Load Distribution of Sub-beam considering Slab Stiffness and Boundary Conditions |
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´ëÇѰÇÃàÇÐȸ³í¹®Áý, Vol.37 No.02 (2021-02) |
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½ÃÀÛÆäÀÌÁö(173) ÃÑÆäÀÌÁö(8) |
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ÀÛÀº º¸; ÇÏÁߺйè; ÀϹæÇâ ½½·¡ºê; ½½·¡ºê °¼º; °æ°èÁ¶°Ç ; sub-beam; load distribution; one-way slab; slab stiffness; boundary condition |
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ÀÛÀº º¸¿Í Å« º¸ÀÇ »ó´ë°¼ºÀ» °í·ÁÇÏ´Â »õ·Î¿î ÀÛÀº º¸¸¦ °¡Áö´Â ½½·¡ºêÀÇ ¹Ù´ÚÇÏÁßºÐ¹è ¹æ¹ýÀ» Á¦¾ÈÇÏ¿´´Ù. ÇöÇà ½Ç¹«ÀÇ 45µµ ±â¹Ý ÇÏÁßºÐ¹è¹æ¹ýÀº ÀÛÀº º¸¿Í Å« º¸ÀÇ ÇÏÁߺйèÀ²(RB:RG)ÀÌ µ¿ÀÏÇÏ´Ù(50:50). ÇÏÁö¸¸, ½½·¡ºê¿ÍÀÇ ÇÕ¼ºÀÛ¿ë ¹× °æ°èÁ¶°Ç °í·Á½Ã ÀÛÀº º¸ ÇÏÁߺдãÀ²ÀÌ Å« º¸¿¡ ºñÇØ ÀÛ´Ù. º» ¿¬±¸¿¡¼´Â ½½·¡ºê¸¦ Æ÷ÇÔÇÑ À¯ÇÑ¿ä¼ÒÇØ¼®¸¦ ÅëÇØ ½½·¡ºê, ÀÛÀº º¸ÀÇ °¼º ¹× °æ°èÁ¶°Ç¿¡ µû¸¥ ¹Ù´ÚÇÏÁߺдãÀ²À» Æò°¡Çϰí, ÇöÇà ¹æ¹ý¿¡¼ÀÇ ¼öÁ¤ ÇÏÁßºÐ¹è¹æ¹ýÀ» Á¦¾ÈÇÏ¿´´Ù. ½½·¡ºêÀÇ ÇÏÁߺйèÀ²Àº ´ëü·Î ÀÛÀº º¸ÀÇ ÇÏÁߺй踦 ´ëüÇÏÁö¸¸, ÀÌ ÇÏÁßÀ» Å« º¸¿¡¼ Ãß°¡ ºÎ´ãÇϵµ·Ï ÇÏ¿© ¾ÈÀüÃø Á¢±ÙÀ» À¯ÁöÇÏ¿´´Ù. ÀÌ ÀçºÐ¹èµÈ ÇÏÁß¹æ¹ýÀº ÀÛÀº º¸ÀÇ ¼º´É¼³°è¸¦ °¡´ÉÇϵµ·Ï Çϸç, ÀÛÀº º¸¿Í Å«º¸ÀÇ ¹Ù´ÚÇÏÁߺдãÀ²(RB:RG) À» 40:60±îÁö Á¶Á¤ÇÒ ¼ö ÀÖ´Ù. |
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A new floor load distribution method for slabs with sub-beam was proposed, taking into account slab stiffness. In the current 45 degree-based load distribution method, the load distribution ratio of sub-beam and girder (RB:RG) is the same (50:50). However, when considering the composite action with slab and boundary conditions, the ratio of sub-beam would be smaller than that of girder. In this study, floor load distribution ratio according to the relative stiffness of slab and sub-beam and boundary conditions was evaluated by finite element analysis including slabs. The load distribution of the slab was greater when increasing the relative stiffness of slab and sub-beam, and that of sub-beam decreased as greater as that of the slab. For conservative design approach, the reduced portion from the sub-beam due to would add the load distribution of girder rather than subtraction from total floor load. In practical modules- span length, beam geometry, etc., the ratio (RB:RG) can be adjusted up to 40:60 by reducing the stiffness of sub-beam obtained by performance based design. |