12.07.2015 Views

NBR 6118

NBR 6118

NBR 6118

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VigasELS - Estado Limite de DeformaçãoFlecha ImediataMódulo 4MyMr⎧⎪ ⎛cs ⎨⎜⎪⎜⎝⎪⎩⎫⎪II⎬⎪⎪⎭3M ⎞3 ⎡⎛rM ⎞⎤r( EI) eq = E⎟I + ⎢c1 − ⎜ ⎟ ⎥ I ≤EcsIM ⎟a⎢M⎠ ⎝ ⎥a ⎠⎣ ⎦(EIo)cProporcional ao(EI)IIProporcional aovr vycv<strong>NBR</strong> <strong>6118</strong> PROJETO DE ESTRUTURAS DE CONCRETO : PROCEDIMENTO D A T A 0 0 / 0 0 / 0 0VigasELS - Estado Limite de DeformaçãoFlecha Diferida no TempoFlecha Total = Flecha Imediata . (1 + α f )Módulo 4com:′Asρ′ =b dαf∆ξ=1 + 50 ρ′onde:ξ coeficiente função do tempo∆ξ = ξ( t ) − ξ(t 0)ξ(t) = 0,68. ( 0,996t) t0,32 para t ≤ 70 mesesξ(t) = 2 para t > 70 meses<strong>NBR</strong> <strong>6118</strong> PROJETO DE ESTRUTURAS DE CONCRETO : PROCEDIMENTO D A T A 0 0 / 0 0 / 0 0

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