The light rigid bar ABCD shown in the × figure is pinned at B and connected to two vertical rods. Assuming that the bar was initially horizontal and the rods stress-free and load P = 20 kips is applied. 4 ft Aluminum L = 4ft A = 0.75 in² E = 10 x 106 psi B Steel L = 3ft A = 0.5 in² E = 29 x 106 psi 2 ft2ft A. What is the stress experienced by aluminum rod B. What is the stress experienced by steel rod. C. What is the resulting deformation on the aluminum rod.

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Stair construction and layout

Stair is a type of vertical transportation in a building which consist of a series of steps in a flight of stairs that enable the vertical movement of people and materials from one floor to another. A staircase consists of steps that comprises of riser & tread, handrail, baluster, stair stringers, newel post and waist slab. The construction of staircase with all the components is termed as stair construction. A staircase is an enclosure that contains the entire stairway. The materials used for the construction of stairs are bricks, reinforced cement concrete, stone, lumber, steel and a combination of these materials.