7. From the cross section given adjacent, if fb, 20 MPa, how much moment can the beam section carry? is limited to 200 max ANSWERS 700 dia = 50 y = 432 mm from base; Ix = 22.08 x 10° mm4 150 Using fb = (M/I)y where fb = 2O N/mm2, 10° mm4 ,y = (1000-432) mm, Ix = 22.08 x %3D 100 150 400 yields M = 778 kNm. CROSS - SECTION

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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.