You are evaluating a composite flexural member in an existing building, loaded as shown in Figure 1. It is a compact built-up doubly-symmetric I-shaped section with a solid composite concrete slab and a cover plate welded to the bottom of the bottom flange. Assume full interaction between all elements of the section. Assume that both flanges are adequately braced. Dimensions and properties are: Flange plates: 0.75 in. thick x 6 in. wide Web plate: 0.25 in. thick x 20 in. deep Cover plate: 1.0 in. thick x 10 in. wide Concrete slab: 6.2 in. thick x 45 in. wide (Measured to x be) L PL L PD PL L L PL Fy= 50 ksi F = 50 ksi Fy= 70 ksi fe' = 4 ksi L = 120 in. PD = 70 kips PL = 50 kips Figure 1- Composite member loading and boundary conditions. Sketch the cross section and show dimensions through the depth.