Question

List three reasons why standards enforce maximum reinforcement ratio in the design of columns

Answer 1

Maximum reinforcement ratio is given by standards because of the following reasons:

1) when the reinforcement is kept on increasing the space for the concrete keep diminishinng and it becomes difficult to place concrete, the working becomes difficult.

2) providing max reinforcement ratio keeps the column safe in bending as it increases its maximum bending moment capacity and the column will be able to resist lateral loads effectively as well.

4) since the RCC structures bear compressive and tensile loads both, so it should be sound in ductility so that the imminent failure can be noticed early. But at the same time if maximum reinforcement exceeds certain value column may have very less compressive strength, since columns are designed as compression members it is necessary to have a check on the maximum reinforcement.