The following spreadsheet demonstrate my program that can analyse any rectangular beam section. The similar program can analyse rectangular column, circular column which will be demonstrated in the my future blog.
Eg. 2.1 -The CSA concrete design handbook give the moment as = 207kNm
My spreadsheet Mr = 205.9 kNm
Eg. 2.4 - CSA concrete design handbook give the moment as = 675kNm
My spreadsheet Mr = 690 kNm
There is a slight discrepancy but it is due to the section analysis is very accurately calculate the neutral axis and checking the yield strength of the tension and compression steel.
So it can be seem that the spreadsheet is very accurate in computing the section capacity based on CSA A23.3 - 04.