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Beban Luar Ws = 14,6 KN / m

5.4. Contoh soal Kehilangan pra tegang. Beban Luar Ws = 14,6 KN / m. Beban balok WG = 6,9 KN / m. b=550mm. 175 mm. 150 mm. h=170 mm. e=340 mm. F. 19,8 m. 1975 mm ². Balok pratekan Pra tarik Perhitungan dg Metode Umum P. C .I Tipe baja tarik “Strand stress relieved”

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Beban Luar Ws = 14,6 KN / m

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  1. 5.4 Contoh soal Kehilangan pra tegang Beban Luar Ws = 14,6 KN / m Beban balok WG = 6,9 KN / m b=550mm 175 mm 150 mm h=170 mm e=340 mm F 19,8 m 1975 mm ² Balok pratekan Pra tarik Perhitungan dg Metode Umum P. C .I Tipe baja tarik “Strand stress relieved” fpu = 1862 Mpa = 270 K s i 1Ksi = 6,895 Mpa fc’i = 4500 psi = 31 Mpa Eci = 26,4 Mpa =3,824 Ksi n’ =7,2 fc’ = 6000 psi = 41,4 Mpa Eci = 30,4 Mpa =4,415 Ksi n’ =6,2 Jawab: Kehilangan Prategang Akibat Relaksasi baja RET = fsi { ( log 24 t - log 24 ti ) / 10 } x (fst / fy - 0,55 ) (1) fst / fy - 0,55 > = 0,05 fst = 0.75 x fpu fy = 0.85 x fpu Fpu = tegangan baja tarik lleleh ( hancur ) fst = tegangan baja tarik mak yg bisa dilaksanakan fy = tegangan yg diperlukan utk memanjangkan baja 1% 41

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