HKCol (HK code Column Design) is a useful tool for concrete column design (generate pmm curve).
It can check column PMM capacity and input the P-M comb in side the curve.
the calculation theory can be found in the website, dinochen.com
all the calculation and design is based on hong kong concrete code 2013.
you can check the column member size very fast by iPhone.
you can use for site design checking, it is a useful hand tool for hong kong structural engineer.
by Dr. Dino Chen.