Método AASHTO introduccion
Transcript of Método AASHTO introduccion
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METODOAASHTO
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Método AASHTO 1. Ensayo Vial AASHTO 2. Interim Guide 1972 3. Método AASHTO 1986 4. Método AASHTO 1993
5. Suplemento Met. AASHTO 1998 6. Método AASHTO 2002
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AASHO Road Test (ART) Basis of AASHTO Design Guide
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Método AASHTOVariables de Diseño (Pav Flexible)
• 1. Tránsito (N)• 2. Serviciabilidad (Dpsi, P0, Pt)• 3. Confiabilidad (R, Zr, S0)• 4. Resistencia de la subrasante (Mr)• 5. Propiedades de los Materiales (E, ai)• 6. Drenaje (Cd)• 7. Número Estructural (SN)• 8. Efectos Ambientales
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VARIABLE TRANSITONúmero acumulado de
ejes equivalentes a8.2 ton. en el carril dediseño durante elperiodo de diseño.
NEje estEje estaandarndarde de 8.28.2 TonTon..
8.28.2TonTon..
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Caracterización de Subrasante Módulo Resiliente
1. Ensayo triaxial dinámico Mr= A * sdB * QC
2. Relaciones empíricas
Mr=1500 * CBR psi
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Formula General Método AASHTOLog N = Zr* S0 + 9.36 log (SN +1) - 0.20 +
Log ( D PSI4.2 - 1.5
0.40 + 1094(SN +1) 5.19
+ 2.32 Log Mr - 8.07+)
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Acción combinada del tránsito y el clima
Serviciabilidad Del Pavimento
Log N
PSI
Inicial (Po)
Final (Pt)
Rugosidad y Deterioro
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Expresiones de Indice de Expresiones de Indice de ServiciabilidadServiciabilidad
Pavimentos FlexiblesISP = 5.03 –1.9 Log (1+SV) –1.38 RD2 – 0.01*(C+P)½
Pavimentos Rígidos
ISP = 5.41 –1.8 Log (1+SV) – 0.09*(C+P)½
SV= Variación de PendienteRD= Desplazamientos VerticalesC = Grietas P = Parches
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Numero EstruturalNumero Estrutural
SN = a1H1+a2H2m2+a3H3m3
Base
Subbase
Subrasante
C.A H1
H2
H3
a1
a2
a3
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CoeficientesEstructurales (ai)
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Determinación de Espesores
P PQ Qa a
S
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SUBBASE
BASE
Cto Asfáltico
D3
D1
D2
SN3
SN2
SN1
SUBRASANTE
1
1
aSND1
22
122
maSNSND
33
233
maSNSND
1111 SNDaSN
222212 SNDmaSNSN
333323 SNDmaSNSN
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Estructura Diseñada
7.5 cm15 cm
30 cm
a1=0.44
a2 = 0.14
a3 = 0.11
Mr = 300
u1= 0.35
u2= 0.40
u3= 0.45
u4= 0.50
P P =2050 Kg
Q Q=5.6a a=10.8
3a
Base
Subbase
Carpeta