Without doing any calculations, draw a sample P$-$M interaction dagram for a reinforced concrete column. Identify, approximately, the parts of the diagrams on which the failure is compression controlled, tension controlled, and the transition between the two types of failure.

Without doing any calculations, for the sample $P-M$ interaction diagram of question $1,$ show the reduced diagram resulting from the application of the strength reduction factor $($different for each type of failure$).$

Without doing any calculations, for the sample $P-M$ interaction diagram of question $1,$ show what would be the effect of increasing the reinforcement ratio.