Test: Beams - 1 - Civil Engineering (CE) MCQ

According to I.S. 800 - 1984 the maximum permissible shear stress should not exceed the value of τ_vm given by τ_​vm = 0.45 f_y. The permissible average shear stress τ_vaon a web whose depth does not exceed 85 times its thickness, is equal to 0.40f_y.
The allowable shear stress in the web of a mild steel beam decreases with increase in hit ratio. And for same h/t ratio allowable shear stress decreases with increase in spacing of stiffeners.

As per IS; 800-1984 Clause 6.7,4.4 unless the outer edge of each stiffener is continuously stiffened, the outstand of all stiffeners from the web shall not exceed for sections and 12t for flats where ‘t is the thickness of the section or flat.

The beam column connections expected to resist and transfer end reactions only are termed as shear connections or flexible connections. These permit free rotation of the beam end and do not have any moment restraint. Bracket connections, seat connections (unstiffened and stiffened) and framed connections are of flexible type.
The other type of connections which do not permit any relative rotation between the beam and column and are expected to resist moment in addition to end reactions are termed as moment connections or rigid connections. For cantilever arm both moment and end reaction is to be transferred without rotation and therefore rigid connections would be the best choice. Clip angle connection, split beam connection and bracket connection (end plate connection) are rigid connections.

The maximum bending stress is given by,

The grillage base essentially consists of steel beams encased in concrete. They are provided when,
(i) The load on the column is very heavy.
(ii) The bearing capacity of the soil on which the concrete block is to be placed may be poor.
They are designed for bending, shear and web crippling.