Composite Modulus of Subgrade Reaction(kc)

301-2January 1999

Ref. Section & Figure301.4, 302-1 (step_ÿ__

Exomp le:

DsB(Assumed) = 6 inches .(150 ram)

ESB= 30,000 psi {Figure 301-1)

FAR = 7,200 psi {Figure 205-1)

Solution:kc= 400 pci

2,0003,000

5,0007,000

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1,000

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I,O00,O00600,000400,000200,000

%88850,00030,00015,000

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Effective Modulus of SubgradeReaction (k)

301-3January 1999

Ref. Section & Figure301.6, 302-1 (step 5)

I000

o,-,." ÿ 100

oÿL ÿ 50

''S

o L

/

/

f

/

/,,/" I

oÿ Jo

a 5o

q..,14-w

J

5 I0 50 I00(4,

Compoail"e Modulus of Subÿracle Reactlon, ko (pod

I000 2000

Example:Kc = 400 pci (Fig. 301-2)LS 1.0 (Fig, 301-1)SoluTion:K = 130 pci

Rigid Pavement Design ChartSegment 1

302-2January 1999

Ref, Section & Figure302, 302-1 (step 6)

Drainage Coefficient, Cd

i__I

Examplek = 130 pci (Fig. 301-31 Lo "TransferEc = 5.0xlO6 psi [Fig. 301-11 Coe nt, J

Sic = 700 psi (Fig. 30HI [XIJ = 2.8 (Fig. 301-11 04 CO ÿT" . ÿ.,

Cd = 1.0 (Section 205.21 ÿ- PO Iÿ bO 0ÿ%

%%

%%

%

Mean Concrete Modulus o ÿRupture, Sic (psi) "ÿ

0 0 0 ÿ 0 0 ÿo°oo o o ROd -- 0 Oh ÿ oo LO Lr)

1IIi

Rigid Pavement Design ChartSegment 2

302-3January 1999

Ref, Section & Figure302, 302-1 (step 6)

IO00

NOTE= Application of reliabilityiri 'thls chart requiresthe use of mean valuesfor all input variables,

IIIIII

EXAMPLE:TL

R:85% (Fig. 201-1)

So=0.39 (Fig. 201-1)

ESAL:I3.7xl06(Fig. 302-1)

A PSI=I.7 (Fig. 201-1)

Solution D=9.6 inches