In compression members, the lap length of a bar should not be less tha

If `Delta` is the deviation of the individual test strength from the average of n samples, the standard deviation of concrete of the given grade is

The maximum compressive strength on 15 cm cubes of M 20 grade concrete at 7 days, should be a minimum of

The maximum horizontal deflection of a column of actual length L, when subjected to lateral forces, may be upto

In the formula a + bk for the calculation of the net effective section of single angles in tension connected by one leg only, the value of k, is

If the
slenderness ratio of a column is more than 160, the compressive stress
obtained by the secant formula is multiplied by a factor `(x -  (1)/(800r))` in which value of x is

The approximate value of torsion constant k for a box of depth d, width b, and having uniform thickness t, is

If D is the overall thickness of the slab, the diameter of the reinforcing bars should not exceed

The maximum pitch of rivets for compression and tension members should not exceed

If l is the effective span in metres and D
is overall depth of the section in mm, the structure may be accepted
after 24 hour load test, provided the maximum deflection in mm is less
than