The allowable shear stress in the web of mild steel beam decreases with
where 'h' is height and ‘t is thickness
According to I.S. 800 - 1984 the maximum permissible shear stress should not exceed the value of The permissible average shear stress on a web whose depth does not exceed 85 times its thickness, is equal to
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.
The outstand of the flange of built-up beams from the line of connection should not extend beyond
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.
A cantilever arm is to be attached to a column. Which one among the following is the best connection?
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.
A steel beam is connected to a steel column by means of two angles placed on the two sides of the web of the beam. What is it called?
A cantilever steel beam of 3 m span carries a uniformly distributed load of 20 kN/m inclusive of self-weight. The beam comprises of ISLB200@198 N/m, flange = 100 mm x 7.3 mm; web thickness = 5.4 mm; Ixx= 1696.6 cm4; Iyy = 115.4 cm4. What is the maximum bending stress in the beam ?
The maximum bending stress is given by,
The heaviest I section for same depth is
Generally the maximum deflection of a steel beam should not exceed
Consider the following statements:
A grillage base is checked for
4. web crippling
Which of these statements are correct?
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.
Lateral buckling of beam is not prevented by
A steel beam supporting loads from the floor slab as well as from wall is termed as