Introduction
In Limit state design, a reinforced concrete structure is normally designed for limit state of collapse and is checked for limit state of serviceability. The collapse of structure occurs by failure of its member either in flexure, shear, bond, torsion, axial compression or tension, or by combination of these actions. This IDEAMOOC mainly deals with the limit state of collapse in flexure. The strength of a member at limit state of collapse is known as ultimate strength and this term will, therefore, be used hereafter for convenience.
A beam is usually a flexural member as the load applied will cause (usually) the bottom flange to go into tension and the top flange to be compressed. In simply supported reinforced concrete beam section, there are two zones namely
a)Tension zone
b)Compression zones.