How to resolve the issues for calculating the design moment strength of a doubly RC section

This construction video shows the detailed processes for measuring the design moment strength concerning a doubly reinforced concrete section.

The video is divided in two parts :-

Part 1: problem description, strain/stress profiles, locating neutral axis depth
Part 2: calculating nominal moment, strength reduction factor, design moment strength.

By going through this construction video, one can resolve any problem associated with reinforcement concrete design.

A doubly reinforced concrete section is reinforced in both compression and tension regions. The section of the beam or slab may look like a rectangle, T and L section.

There exist two types of problem in doubly reinforced beams similar to the singly reinforced beams:
(i) Analysis of section, and
(ii) Design of section.

The analysis of doubly reinforced section finds out the amount of moment of resistance with breadth, depth, area of tension and compression steels and their covers.

The design of a doubly reinforced sector finds out the cross sectional dimensions and areas of tension and compression reinforcements.