Homework Answers
a) here the stiffness of each bar is calculated and we can find the total stiffness
Stiffness K= load(F)/deflection(d)
K=F/d , displacement of spring(d) = F/K=FL/(4EA)
Elongation of rods can be found in similar manner
Here stiffness of each bar is calculated and total stiffness is calculated
K1for rod1 = EA/L
K2 for rod2 = 2EA/L
Keq=K1+K2= 3EA/L
The elongation of rods = F/Keq
d= FL/3EA
b) here we can generate an equivalent spring Keq=17k
Taking momentum equation
Reaction at pin joints are Ra and Rb taking moment about a then F=Rb + Kd/2
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