Concept:
Control of Deflection:
The deflection of a structure or part thereof shall not adversely affect the appearance or efficiency of the structure or finishes or partitions. The deflection shall generally be limited to the following:
The vertical deflection limits may generally be assumed to be satisfied provided that the span to depth ratios are not greater than the values obtained as below:
Basic values of span to effective depth ratios for spans up to 10 m:
Type of beam |
Span/depth ratio |
Cantilever beam |
7 |
Simply supported beam |
20 |
Continuous beam |
26 |
For spans above 10 m, the values in (a) may be multiplied by 10/span in meters, except for cantilever in which case deflection calculations should be made.
Explanation:
For the simply supported beam having span less than 10 m the value of span/depth ratio is 20