Download - 13.analisis carga vertical
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San Bartolomé
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METRADO DE CARGAS VERTICALESEN LOS MUROS
TIPOS DE CARGA:
1.- DIRECTAS (peso propio, peso de soleras, peso decolumnas, peso de dinteles y alféizares).
2.- INDIRECTAS (peso de la losa, acabados, sobrecarga).
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ÁREAS DEINFLUENCIAPARA UNALOSA ARMADAEN DOSSENTIDOS
Pm = CARGAAXIALACUMULADACON 100% S/C
dintel
< 0.15 f´m
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Para el caso deMuros Confinadospuede recurrirsea las columnaspara disminuirel esfuerzo axialen la albañilería,sin embargo:
σ = P/(L t) < 0.15 f´m
fa = Pa/Aa < 0.2f´m [1-(h/35t)2]
De ninguna manerase deberá sobrepasar:
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CASO DE MUROS ARMADOSRevisar el borde libre más solicitado por concentración
de esfuerzos, usar la carga no acumuladaσ = F / Am = F / (t x 3 t) < 0.375 f´m
t3t
F
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F / (B t) < 0.375 f´m
FB
B = b + 2t + 2t
muro
viga
Aplastamiento Local
b
t
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Pi = CARGA NOACUMULADA
CENTRO DEGRAVEDAD
“CG”
en “CG” actúan“Fi”
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ÁREAS TRIBUTARIAS EN UNALIGERADO UNIDIRECCIONAL
vigueta
chata
muro
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PORQUÉ REDUCIR LA CARGA VERTICAL
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-Carga Lateral Cíclica-Carga Vertical Constante
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CON ELINCREMENTODE LA CARGAVERTICAL SEREDUCE LARESISTENCIAINELÁSTICA YLA CAPACIDAD DEDEFORMACIÓNINELÁSTICA
V (ton)
D (mm)
-1010
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Talóntriturado
FLUJO DE CARGAS
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COSER LA GRIETA DIAGONAL CON REFUERZOHORIZONTAL CONTINUO ANCLADO EN COLS. San Bartolomé
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Cuantía = 0.1%
= As / s t
s
As
t
La cuantía especificada esun valor nominal para todomuro confinado que tenga0.05 f´m < σ < 0.15 f´m
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D = 15 mm, σ = 0.09 f´m
SIN REF. HOR.. CON REF. HOR.
ρ = 0.1%
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V (ton)
D (mm)
CON REF.HOR.
SIN REF.HOR.
EFECTOS DE LA CARGA AXIALSan Bartolomé
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Variación del Desplazamiento Vertical Extremo
con refuerzo hor.
sin refuerzo hor.
Dh
Dv
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REDUCIR LA CARGA VERTICAL CON LOSAS ARMADAS EN 2 SENTIDOS(ALIGERADA O MACIZA) San Bartolomé
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San Bartolomé
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LOSA ALIGERADAUNIDIRECCIONAL
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