Definition of radius of relative stiffness
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A certain degree of resistance to slab deflection is offered by the sub - grade. the sub grade deformation is same as the slab deflection . hence the slab deflection is direct measurement of the magnitude of the sub grade pressure . this pressure deformation characteristics of rigid pavement lead westergaard to the define the term radius of relative stiffness 1 in cm is given by the below equation
l=4√(Eh^3)/(12k(1-mu square))
l=4√(Eh^3)/(12k(1-mu square))
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