The beam structure shown in Figure Q3 has a uniform cross-section of flexural rigidity EI. It has...

The beam structure shown in Figure Q3 has a uniform cross-section of flexural rigidity EI. It has a length L; it is built-in at the end A and simply supported at the point B at mid-span. A uniformly distributed load of intensity w per unit length is applied along the span ABC Using Castigliano's theorem, determine (a) he reaction at B, and (b) the horizontal deflection at D. w/unit 1ength Figure Q3 L/2 L/2