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Contoh soal ( Batas Momen Retak )

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4.2.1. Contoh soal ( Batas Momen Retak ) Berapakah beban merata maksimal ( q ) yang bisa dipikul, supaya tidak terjadi retak pada balok prategang , apabila berat sendiri beton diabaikan . ?

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4.2.1

Contoh soal ( Batas Momen Retak )

Berapakah beban merata maksimal ( q ) yang bisa dipikul, supaya tidak terjadi retak

pada balok prategang , apabila berat sendiri beton diabaikan. ?

Batas Tegangan Tarik Beton ( fr ) fr = 4,2 N / mm  = 4,2 Mp a

Beban Luar q KN / m q= ? KN / M

y

h=600 mm

F= 1620 KN

e=125 mm

F

y

L=8 m

b=300mm

Jawab :

M batas retak = F ( e + 1 / 6 h ) + fr X 1/ 6 bh2

M = 1.350.000 N ( 125 mm + 100 mm ) + 4,2 N / mm2 x 1 / 6 X 300 mm X ( 600 mm )2

= 303,75 X 10^6 Nmm + 75,6 X 10^6 Nmm = 379,35 X 10^6 Nmm

= 379,35 K N m

M mak ( M ditengah ) = 1 / 8 ql  = 1 / 8 . q X ( 8 m) 

= 8 q m 

Persamaan :

8 q KN m < 379,35 KN m

q< 379,35 KN m/ 8 q KN m

q < 47,41 KN / m

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