LOSA EJE
-
Upload
jose-calos-falen -
Category
Documents
-
view
214 -
download
0
description
Transcript of LOSA EJE
Hoja1
PUENTES Y OBRAS DE ARTE1)DISEAR UN PUENTE LOSA DE L = 8 m.
Datos de DiseoLONGITUD DE TRAMO:8.00 mUsuario:HL 93F'c=280 Kg/cm2Fy=4200 Kg/cm2Ancho de calzada:8.40 mEspesor de asfalto:0.05 mPeso especifico - Asfalto :2250. kg/cm2Peso especifico - concreto :2400. kg/cm28.00 m
Solucion
A)Predimensionamientot min = 1.2 (8000 + 3000)30
t min = 440mmt min = 0.44=0.45 m0.6 m3.6 m3.6 m0.6 m1 0.45
8.40 m
ANCHO FISICO
B)Momentos de Flexion
Carga Muerta (Dc)W dc =0.45 x 1.00 x 2.4W dc =1.08Tn/mM dc =1.08 x 8 x 88
M dc =8.64Tn-m
Carga por Sup. De Rodadura (Dw)W dw =0.05 x 1.00 x 2.25W dw =0.113Tn/mM dw =0.113 x 8 x 8 8
M dw =0.9Tn-m
Carga Viva (LL)
Mll + Im =58.66Tn-m
Falla crtica (E)
Caso 2:Carriles cargados
E =3.084.2metros
Caso 1:Carril cargado
E =3.69metros
Ancho de Falla crtica E=3.08E=4.2E=3.69
ANCHO CRITICO:3.08metrosMll + Im =58.663.08
Mll + Im =19.02Tn -m
C)Criterios LRFD aplicableResist 1 =1.25 Dc + 1.50 Dw + 1.75 (LL + IM)Servicio 1 =1.00 dc + 1.00 Dw + 1.00 (LL + IM)Fatiga = U =0.75 (LL + IM)Mu =1.25 (8.64) + 1.5 (0.9) + 1.75 (19.05)Mu =45.30Tn-mAs principal paralela al trficoAs 1"rec = 2.5 cm1 " =2.54 cmZ = 3.770 cmd =41.23 cmdb=100. cm0.45fy=4200.01 "fc=280.02.5 cmzMu=45.30 ton-m
Entonces:As=31.3cm2a= 5.5cm2
As maxc 0.42doc =ac =5.50.89c =6.18 0.42OK
As min1.2 Mr y 1.33 Mua)1.2 Mr = 1.2 Fr SF'c=280 Kg/cm2 =27.46 MpaFr=33.66Kg/cm2Fr=3.3 Mpa=100 (0.45x0.45)6S =33.75cm2Entonces:1.2 Mr = 1.2 (33.66)(33.75)1.2 Mr =13.63Tn - mb)1.33 Mu 1.33 Mu =1.3 (45.30)1.33 Mu =58.89Tn-m13.63Es ResistidoOK
Hoja2
Hoja3