Prestressed Concrete intro

Prestressed Concrete intro - =-0.666-1.4909+0.0247=-2.13...

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Prestressed Concrete Assuming the following : Area of reinforcement =774 mm 2 f’c = 35 MPa P=1.1 GPa Section Properties : I=(1/12)x30x55 3 =415937.5 cm 4 . A=30x50=1650 cm 2 Total loads on beam=3T/m Beam weight =23.5KN/m 3 *0.3*0.55=3.8775 KN/m M=wl 2 /8=30000*12 2 /8=540 KN.m Stresses at beam Centerline : f top= - + PA PecI - =- . * + . * * . * . . - * . . McI 1 1 1031650 1 1 103 20 5 27 5415937 5 540 27 5415937 5 f top =-0.666+1.4909-0.0357=0.789 MPa. f bot
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Unformatted text preview: =-0.666-1.4909+0.0247=-2.13 MPa. Stresses at beam ends : f top =-0.666+1.4909=0.824 MPa. f bot =-0.666-1.4909=-2.156MPa. Deflection Immediately after cables are cut : D due to cable = -=- . * . * * . *( * ) * * . Pel^28EI 7 74 1 1 103 20 5 12 100 ^28 27800 415937 5 = -2.716 cm D due to beam = = * . *( * ) * * . 5wl^4384EI 5 3 8775 12 100 ^4384 27800 415937 5 = 6.338 cm...
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Prestressed Concrete intro - =-0.666-1.4909+0.0247=-2.13...

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