If the compatibility condition is written as ${}_{CD}=C_0^{**}{}_{AB}+C_1^{**}{}_{EF},$ find $C_0.$ If the compatibility condition is written as ${}_{CD}=C_0^{**}{}_{AB}+C_1^{**}{}_{EF},$ find $C_1.$A rigid beam is subjected to a linearly distributed load and is supported by three bars, as shown in

Figure $3.$ Bars AB and EF are made of steel and bar CD is made of aluminum. The cross$-$sectional areas are $A_{st}$ for the steel bars and $A_{al}$ for the aluminum bar.

Assuming that all the bars remain elastic,

a$)$ Find the value of the distributed load $q$ so that the elongation of the aluminum bar is ${}_1.$

b$)$ Find the value of the distributed load q so that the minimum elongation of the steel bars is at least ${}_2.$

Figure $3$: Rigid beam supported by three bars.

The elastic modulus for steel and aluminum are $E_{st}=200$GPa,$E_{al}=70$GPa, respectively.

Take $A_{st}=1100m{m}^2$ and $A_{al}=400m{m}^2.$

Take $a=1\mathrm{.}4m,{}_1=7mm,{}_2=3mm$