4.5.3.3.5Pressure coefficients on overhangs from roofs

The pressure coefficients on the top over-hanging portion of the roofs shall be taken to be the same as

that of the nearest top portion of the non-overhanging portion of the roofs. The pressure coefficients for the underside surface of the over-hanging portions shall be taken as follows and shall be taken as positive, if the overhanging portion is on the windward side:

1. 1.25, if the overhanging slopes downwards;

2. 1.00, if the overhanging is horizontal; and

3. 0.75, if the overhanging slopes upwards.

For overhanging portions on sides other than windward side, the average pressure coefficients on adjoining walls may be used.

4.5.3.3.6 Curved roofs

For curved roofs the external pressure coefficients shall be as given in Table 21. Allowance for local effects shall be made in accordance with Table 9. Two values of $C_2$ have been given for elevated curved roofs. Both the load cases have to be analysed, and critical load effects are to be considered in design.