Question $1$

See the pin$-$jointed frame shown in Figure Q$1.$ AP and BP are both rigid and are connected with pin P$.$ A horizontal uniformly distributed load $q=8k\frac{N}{m}$ is applied on part of $BD$ as indicated.

a$.$ Compute the reaction forces.

b$.$ Compute the value of the bending moment at $D.$

c$.$ In maximum $5$ lines, explain how can it immediately be seen that the magnitude of the bending moment at $D$ is twice that of the bending moment at $C.$ Sketches are permitted, but do not use calculations.

$2$

$2$