Structure Engineering notes for GATE and PSUs - part 10

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How have you been? Here is our next part for your preparation of GATE and PSUs examinations.

• Half of the main steel in a simply supported slab is bent up near the support at a distance of l/7 from the center of slab bearing.
• When shear stress exceeds the permissible limit in a slab, then it is reduced by increasing the depth of the beam.
• If the size of panel in a flat slab is 6m * 6m, then as per Indian Standard Code, the widths of column strip and middle strip are 3.0 m and 3.0 m.
• For a slab supported on its four edges with corners held down and loaded uniformly, the Marcus correction factor to the moments obtained by Grashoff Rankine's theory is always less than 1. 
• The permissible diagonal tensile stress in reinforced brick work is about 0.1 N/mm2.
• The limits of percentage p of the longitudinal reinforcement in a column is given by 0.8% to 6%.
• The minimum diameter of longitudinal bars in a column is 12 mm.
• The minimum cover to the ties or spirals should not be less than 25 mm.
• The load carrying capacity of a helically reinforced column as compared to that of a tied column is about 5% more.
• The diameter of ties in a column should be more than 5 mm and also more than one-fourth of diameter of main bar.
• Due to circumferential action of the spiral in a spirally reinforced column both the capacity of the column and ductility of the column increase.
• For heights beyond 6 m counterfort RC walls are preferred over L and T -shaped walls.
• For the design of retaining walls, the minimum factor of safety against over-turning is taken as 2.0

All information is learned through books and practical exercises.

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