$11\mathrm{.}33.$ A hinge$-$ended bar of length $L$ and stiffness $EI$ has an initial curvature expressed by $v_0=a_{1}sin(\frac{x}{L})+5a_{1}sin(2\frac{x}{L}).$ If this bar is subjected to an increasing axial load $P,$ what value of the load $P,$ expressed in terms of $L,E,$ and I, will result in zero deflection at $x=3\frac{L}{4}?$