Diseño de Pavimentos de Hormigón Método de la Portland Cement Association PCA 84 Christian O. Rojas Torrico Ingeniero civil, Magister en Ingeniería Vial
Cochabamba - Bolivia
[email protected]
a os enera es
Proyecto: Tipo de carretera: Numero de carriles por sentid Bermas de hormigón: Barras pasajuntas: Tipo de subbase: Observaciones adicionales:
Ejemplo Autopista interdepartamental interdepartamental 2 No Si Granular -
20 años Periodo de diseño: Pesado tipo 2 Tipo de distribución de cargas de tráfico: 6.0 % camiones que circulan sobre el borde del pavimen % (Método PCA considera el 6%) 1.2 Factor de seguridad de cargas: T.P.D .P.D.A .A.. (inc (inclu luye yend ndo o vehí vehíc culos ulos livi livian anos os))= Porc Porcen enta taje je de vehí vehícu culo los s pesa pesado dos s en el tráf tráfic ico: o: Tasa de crecimiento anual: Factor de distribución por carril: Factor direccional:
### 19.0 19.0% % 4.4% 0.79 50%
Tráfico de diseño (solo camiones pesa ###
(vehículos de más de cuatro llantas)
vehículos/día
ulo de espesor por F lo de espesor por Er
PLANILLA DE CÁLCULO DE ESPESORES Valo Valorr CBR CBR subr subras asan ante te Módu Módulo lo k de subr subras asan ante te:: Modulo k combinado: Modulo de rotura: Varian Varianza za de resi resist sten encia cia::
4.96% 4.96% 28.9MP 28.9MPa/ a/m m 106. 106.8 8 pci 35.3 M Pa Pa/m 130.1 pci 4.48 Mp Mpa 650.0 psi 15% 15% (Méto (Método do cons consid ider era a 15%) 15%)
Espesor losa de Hormigón:
23.7 cm
Espe Espeso sorr subb subbas ase: e:
10.2 10.2 cm
Anál Anális isis is por por fati fatiga ga Anál Anális isis is por por eros erosió ión n Carga por Corrección Repeticiones en el carga por Repeticiones Acumulació Repeticiones Acumulaci eje (Ton) periodo de diseño LSF admisibles n de fatiga admisibles ón erosión EJES SENCILLOS Esfuerzo equivalente: Relación de esfuerzos: 15.4 18.5 14.5 17.4 13.6 16.3 12.7 15.3 11.8 14.2 10.9 13.1 10.0 12.0 9.1 10.9 8.2 9.8 7.3 8.7 6.4 7.6 5.4 6.5 4.5 5.4 3.6 4.4 2.7 3.3 1.8 2.2
1.4 MP MPa
210.2 ps psi
0.323 6,347 14,733 30,147 64,373 106,987 235,733 307,360 422,507 586,840 1,837,133 -
2000 5865 17270 51079 152964 646345 9248349 Ilimitadas Ilimitadas Ilimitadas Ilimitadas Ilimitadas Ilimitadas Ilimitadas Ilimitadas Ilimitadas
0.0% 0.0% 36.7% 28.8% 19.7% 10.0% 1.2%
603276 855823 1248837 1886899 2980228 4992686 9088191 18799720 48868825 221806710 Ilimitadas Ilimitadas Ilimitadas Ilimitadas Ilimitadas Ilimitadas
0.0% 0.0% 0.5% 0.8% 1.0% 1.3% 1.2% 1.3% 0.6% 0.2%
0.70 0.66 0.62 0.58 0.54 0.50 0.46 0.42 0.38 0.34 0.30 0.26 0.22 0.18 0.14 0.09
0.0% 0.0% 3.0% 0.5%
359373 532007 814734 1301813 2198006 4001731 8141260 19915013 71459225 1240456722 Ilimitadas Ilimitadas Ilimitadas Ilimitadas Ilimitadas
0.0% 0.0% 2.6% 3.3% 5.7% 9.3% 10.9% 4.7% 2.3% 0.1%
0.57 0.54 0.50 0.47 0.43 0.39 0.36 0.32 0.28 0.24 0.20 0.17 0.13 0.09 0.05
EJES TANDEM Esfuerzo equivalente: Relación de esfuerzos: 27.2 32.7 25.4 30.5 23.6 28.3 21.8 26.2 20.0 24.0 18.2 21.8 16.3 19.6 14.5 17.4 12.7 15.3 10.9 13.1 9.1 10.9 7.3 8.7 5.4 6.5 3.6 4.4 1.8 2.2
1.3 MP MPa
194.3 ps psi
0.299 21,307 42,840 124,893 372,867 885,813 930,693 1,656,253 984,867 1,227,400 1,356,600 -
63724 177106 699495 7960948 Ilimitadas Ilimitadas Ilimitadas Ilimitadas Ilimitadas Ilimitadas Ilimitadas Ilimitadas Ilimitadas Ilimitadas Ilimitadas
=
100.0%
=
45.7%
NOTA IMPORTANTE: En esta versión del método de la Asociación del Cemento Portland de los EE.UU. no se consideraron los efectos del clima sobre los materiales de las diferentes capas del pavimento, por lo tanto no se incluyen variaciones de humedad y temperatura en la subrasante, subbase y losa de hormigón. El modelo de elementos finitos empleado para el desarrollo de este método consideraba solamente losas planas totalmente apoyadas y sin alabeo, sin embargo una gran cantidad de estudios verificaron que las tensiones generadas por alabeo combinado con cargas de tráfico son mucho mayores debido a la falta de soporte que se produce por la curvatura de las losas.
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700
M , k n ói c c a re e d lo u d ó M
m/ a P
Row 9
6.0
Row 9
600 trafico total camio 10880000.37
500 400
Berma no pasadores si 300 k MR 200 coef var MR % camiones borde 100 LSF Espesor fatiga 0 18 Esp1e9sor er2o0sion 21
75 4.5 15% 6% 1.2 25.7 22 22.823
100
24.6 24 22.2 5
5.5
a P M , ar ut ro 13e0 d ol u d ó M
5.0 4.5
170
220
22.9 21.2 19
22.2 20.8 21
4.0 3.5
23.7 3.0 77 26 21.2
Espesor de losa, cm
18
20
Esp
9.00
s e n oi m a c %
s a s ol e d e dr o b n e
8.00
F S L , a gr a c
trafico total camio 10880000.37
7.00 Berma no pasadores si k MR coef var MR % camiones borde LSF Espesor fatiga Espesor erosion
6.00 5.00 4.00 3.00 2.00 1.00
200 3.5 15% 6% 1.2 Row 54 26.7 21
4
Row Row 54
24.3 21
0.00 18
19
20
21
22
23
24
25
Espesor de losa, cm trafico total camio 10880000.37
m c ,
ot n e mi v a p l
e d
B40 erma no R o w 8 6 Row 114 pasadores siRow 100 k 200 35 M R 4.5 coef var MR 10% % 6% 30camiones borde LSF 1.2 Espesor fatiga 21.5 25 Espesor erosion 21
r
o s e
20
1.35 1.30 1.25 1.20
e d 4.5 d 1.15 a di 1.10 r u g 1.05 e s 22.4 1.00 e 21 d r 0.95 ot c 26 2a 7 0.90 F
18
5
5.5
20.7 21
19.4 21
19
20 E
Row 128
15%
20%
22.4 21
23.3 21
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MR coef var MR % camiones borde LSF Espesor fatiga Espesor erosion
4.5 15% 0% 1.2 19.6 21
2
4
6
8
21.7 21
22.1 21
22.4 21
22.5 21
200 4.5 15% 6% 1 20 18.3
1.1 21.3 19.7
1.2 22.4 21
1.3 23.8 22.3
27314
163883
546278
1365695
2731390
130 4.5 15% 6% 1.2 19 11.9 19
20.1 15.2 20.1
21 18.2 21
21.8 20.9 21.8
22.4 23.2 23.2
27314
163883
546278
1365695
2731390
trafico total camio 10880000.37 Berma no pasadores si k MR coef var MR % camiones borde LSF Espesor fatiga Espesor erosion
trafico total camio Berma no pasadores no k MR coef var MR % camiones borde LSF Espesor fatiga Espesor erosion
trafico total camio Berma si pasadores no k MR coef var MR % camiones borde LSF
130 4.5 15% 6% 12
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trafico total camio Berma no pasadores si k MR coef var MR % camiones borde LSF Espesor fatiga Espesor erosion
trafico total camio Berma si pasadores si k MR coef var MR % camiones borde LSF Espesor fatiga Espesor erosion
27314
163883
546278
1365695
2731390
130 4.5 15% 6% 1.2 19 10.3 19
20.1 12.8 20.1
21 14.9 21
21.8 16.8 21.8
22.4 18.3 22.4
27314
163883
546278
1365695
2731390
130 4.5 15% 6% 1.2 16.2 9.2 16.2
17.3 11.6 17.3
18.1 13.5 18.1
18.7 15.1 18.7
19.3 16.4 19.3
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Row Row 24
Row Row 24
280
22
400
21.5 20.5 23
24
20.5 20.1 25
26
esor de losa, cm
n ó ig mr o h l e d ai c n e 600tsi s er al e d a 19.4zn 19.7air 27a V
0.22 0.20 0.18 0.16 0.14 0.12 Row 39
0.08 18
19
1
22
23
Row Row 69
24
pesor de losa, cm 28
,
m c ot n e mi v a p
l
26 24 22 20 18
o s
16
r
e d
Row 128 Row 114 Row 142 Row 114
25
26
27
20
21
22
23
Espesor de losa, cm
26.7 19.4 1.38 Row Row 69
Row Row 39
0.10
24
2
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1.15
546 462 2780
1092 925 5560
273 27 313 138 899
819 81 941 416 698
23 25.8 25.8
23.7 28.6 28.6
24.5 32.6 32.6
25.6 37.6 37.6
546 462 2780
1092 925 5560
273 27 313 138 899
819 81 941 416 698
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5462780
23 19.9 23
5462780
19.8 17.7 19.8
10925560 10
23.7 21.7 23.7
10925560 10
20.4 19.1 20.4
27313899 27
24.5 24.1 24.5
27313899 27
21.2 20.7 21.2
81941698 81
25.6 27 27
81941698 81
22.1 22.6 22.6
trafico total ca Berma pasadores k MR coef var MR % camiones b LSF Espesor fatig Espesor erosi
TRAFICO SO trafico total ca Berma pasadores k MR coef var MR % camiones b LSF Espesor fatig Espesor erosi
TRAFICO ME trafico total ca Berma pasadores k MR coef var MR % camiones b
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26
27
25.7 19.4 1.32
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23.8 20 1.19
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27314
163883
546278
1365695
2731390
5462780
10925560
130 4.5 15% 6% 1.2 13.2 7.8 13.2
14.1 9.7 14.1
14.8 11.2 14.8
15.4 12.5 15.4
15.9 13.5 15.9
16.3 14.5 16.3
16.8 15.4 16.8
163883
546278
1365695
2731390
5462780
10925560
130 4.5 15% 6% 1.2 20 10.4 20
21.2 12.9 21.2
22.1 14.9 22.1
22.9 16.8 22.9
23.5 18.3 23.5
24.1 19.9 24.1
24.8 21.6 24.8
27314
163883
546278
1365695
2731390
5462780
10925560
no si
BRECARGADO 27314 no si
DIANO
no si 130 4.5 15% 6%
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2731 27 3138 3899 99
8194 81 9416 1698 98
17.4 16.6 17.4
18.1 17.9 18.1
2731 27 3138 3899 99
8194 81 9416 1698 98
25.8 24
26.9 26.9
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Livi Livian ano o Ejes Ejes simp simple les s Carga kips 34.0 32.0 30.0 28.0 26.0 24.0 22.0 20.0 18.0 16.0 14.0 12.0 10.0 8.0 6.0 4.0 Ejes jes tan tandem dem Carga kips 60.0 56.0 52 0
Medi Median ano o Pesa Pesado do tipo tipo Pesa Pesado do tipo tipo Sobr Sobrec ecar arga gado do Nume Numero ro de ejes ejes por por cada cada 1000 1000 cami camion ones es 1 2 3 4 5 0.19 0.54 0.45 0.58 0.63 0.85 1.35 1.78 0.07 1.78 2.77 3.52 1.60 5.21 5.92 4.16 0.96 2.60 7.85 9.83 9.69 4.23 6.63 16.33 21.67 41.82 15.81 16.61 25.15 28.25 68.27 38.02 23.88 31.82 38.83 57.07 56.11 47.76 47.73 53.94 124.00 116.76 182.02 168.85 204.96 142.70 483.10 233.60 732.28 1693.31 Nume Numerro de ejes jes por cada 1000 1000 cam camion iones 1 2 3 4 5 0.57 1.07 1 19 1 96 1 79
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Pesado tipo 2
0.58 1.35 2.77 5.92 9.83 21.67 28.25 38.83 53.94 168.85
1.96
6,347 14,733 30,147 64,373 106,987 235,733 307,360 422,507 586,840 ### -
21,307
200.00 180.00 160.00 140.00 120.00 100.00 80.00 60.00 40.00 20.00 0.00 4.0
8.0 12.0 16.0 20.0 24.0 28.0 32.0 6.0 10.0 14.0 18.0 22.0 26.0 30.0 34.0
200 180
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Liviano Mediano Pesado tipo 1 Pesado tipo 2 Sobrecargado
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% cami camion ones es 0.52 0.55 0.6 0.65 0.7 0.75 0.8 0.85 0.9 0.95 1
3 carr carril iles es TPDA PDA 80000 50000 29000 15000 8000 4500 2200
2 carr carril iles es
1.1 1
f(x) = -0.08 ln(x) + 1.58
0.9 35000 20000 10800 6000 3300 1800 1000
0.8 0.7 0.6 0.5
f(x) = -0.08 ln(x) + 1.41
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Capacidad veh/carril/hora Autopistas centrales sin acceso 48-56 Km/h Autopistas perifericas sin acceso 56-64 Km/h Autopistas rurales con acceso parcial Carr Carret eter eras as rura rurale les s prin princi cipa pale les s con con inte interf rfer erenc encia ias s mode mode Carr Carret eter eras as rura rurale les s prin princi cipa pale les s con con inte interf rfer erenc encia ias s consi consid d
ADT =
11069.05
1500 1200 1000 800 500
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3 carr c arril iles es Logarithmic Regression for 3 carr c arril iles es 2 carr c arril iles es Logarithmic Regression for 2 carr c arril iles es
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ANALISIS DE FATIGA Y EROSION - METO Datos del modelo SA/NS SA/NS/ND /ND
SA/W SA/WS/N S/ND D
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DO PCA SA/ SA/NS/WD
SA/ SA/WS/W S/WD