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ö±Ù ÄÜÅ©¸®Æ®, fck ¿¡ µû¸¥ ¥â1 °ª

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ÄÜÅ©¸®Æ® ¾ÐÃà°­µµ fck (MPa) ¿¡ µû¸¥ ¥â1 °ª

fck ¡Â 28 MPa : ¥â1=0.85
28 < fck < 56 MPa : ¥â1 = 0.85 - 0.007(fck-28)
fck ¡Ã 56 MPa : ¥â1 = 0.65

°è»ê½ÄÀº 28 < fck < 56 MPa ÀÎ °æ¿ì¿¡ Àû¿ëÇÑ´Ù.

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¥â1 = 0.85 - 0.007*(fck-28)
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