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Rumus dan Pengolahan Data. Kehilangan prategang akibat “ Elastisitas Baja “ Es = fcr x n’ ( 2 ) fcr = fc po - fc g = { po / Ac + po x e x e /I } - { M g x e / I }
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Rumus dan Pengolahan Data Kehilangan prategang akibat “ Elastisitas Baja “ Es = fcr x n’ ( 2 ) fcr = fc po - fc g = { po / Ac + po x e x e /I } - { M g x e / I } po = fc t Mg = 1 / 8 x W g x L² Kehilangan prategang akibat “ Rangkak Beton “ CR = (UCR ) (SCF) (MCF) (PCR) ( fc ) (3 ) UCR = 95 – 20 x Ec > 11 Ec ( k SI ) MCF = Tabel no 5 SCF = Tabel no 3 : PCR = AUC t - AUC ti Tabel no 5 Kehilangan prategang akibat “ Susut Beton “ SH = ( USH ) ( SSF ) ( PSH ) (4 ) USH = 27 – 3 x ( Ec ) > 12 Ec ( K s I ) SSF = Tabel no 6 : PSH = AUS t – AUS ti Tabel no 7 Pengolahan Data: Ac = 2 ( 550 x 175 ) + ( 150 x 620 ) = 285500 mm ² =442,5 in ² 1 in ² = 645,2 mm ² (5 ) I = 1/12 x 550 x 970 ³ - 1/12 x (550 – 150 ) x 620 ³ = 3,39 x10 ^ 6 mm ^4 (6 ) 42