Problem $2$: Given the following inputs, determine the maximum principal stress using ExerFE, software.

A single slab founded on two base layers and subjected to a combination of the axle and

thermal loading

Slab: length $=460cm,$ width $=360cm,$ thickness $=10cm,$ elastic modulus $=28000$MPa

Base thickness $=10cm,$ subgrade thickness $=40cm$

Base elastic modulus $=5500$MPa, Subgrade elastic modulus $=250$MPa

Slab and base are unbounded: initial stiffness $=1MP\frac{a}{m}m,$ slip displacement $=0\mathrm{.}1mm$

Dual wheel tandem at the senter of the slab with a load of $P$

$P=70kN+63\mathrm{.}72$

Two temperature changes through the depth: a $-5C$ temperature change at the top of the

slab and a $5C$ change at the bottom of the slab

For other values, take the default values of the software.

Problem $3$: In problem $2,$ if the thickness of the slab increases by $50\%,100\%,150\%,$ and $200\%,$

determine the maximum principal stresses. Afterward, plot charts demonstrating the effect of

thickness variations on pavement critical stress responses.