For the cantilever beam shown in Fig., what will cause zero deflection at A?

 For the cantilever beam shown in Fig., what will cause zero deflection at A?

 

Solution

 

1EI(AreaAC)X¯A=0${\displaystyle \frac{1}{EI}}(Are{a}_{AC}){\overline{X}}_A=0$

1EI[12(4)(4P)(83)−2(400)(3)]=0${\displaystyle \frac{1}{EI}}[\frac{1}{2}(4)(4P)(\frac{8}{3})-2(400)(3)]=0$

P=112.5 N$P=112.5\text{ N}$           answer