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Kehilangan prategang akibat Susut ( SH ) SH = ( USH ) ( SSF ) ( PSH ) USH = 27 - 3 x ( 4,415 ksi ) = 13,76 ksi > 12 ksi OKE SSF = 0, 86 V / S =3 SSF = 0,86 ----------------------Tabel 6 PSH umur 30 hari = ( AUS ) 30 - ( AUS ) 1/24
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Kehilangan prategang akibat Susut ( SH ) SH = ( USH ) ( SSF ) ( PSH ) USH = 27 - 3 x ( 4,415 ksi ) = 13,76 ksi > 12 ksi OKE SSF = 0, 86 V / S =3 SSF = 0,86 ----------------------Tabel 6 PSH umur 30 hari = ( AUS ) 30 - ( AUS ) 1/24 = 0,42 - 0 = 0,42----------------------Tabel 7 SH = 13,76 ksi x 0,86 x 0,42 = 4,970 ksi= 34 , 3 Mpa Kehilangan Total 2hari s / d 30 hari TL = 32,3 Mpa + 44 , 615 Mpa + 34,3 Mpa = 111Mpa fst ( 30 ) = 1222 N / mm^2 - 111 N / mm ^ 2 = 1111 N / mm^2 Tahap Ke 3 Waktu 30 hari s / d 3 tahun ( 3 x 365 = 1095 hari ) fst ( 30 ) = 1222 N / mm^2 - 111 N / mm ^ 2 = 1111 N / mm^2 Ada Beban tambahan Ws = 14,6 KN / m Tambahan tegangan akibat Ws= 14,6 KN / m I= 3,39 x10 ^ 10 mm ^ 4 = 0,0339 m ^ 4 e = 340 mm = 0,340 m frc = M(ws ) x e / I = {( 1/8 x 14,6 x 19,8 ^ 2 )x 0,340 } / ( 0,0339) = 715,473 x 0,340 / 0,0339 = 7175,835 KN / M^2 = 7175, 835 x 10 ^3 / 10 ^ 6 mm ^2 = 7 , 175 N / mm ^2 = 7 Mpa fst (30) + Akibat Beban Ws =fst ‘ (30) = 1111 Mpa + 7 x n ‘ Mpa = 1111Mpa + 7 x 6,2 Mpa = 1159 Mpa 46
