RE: Circular Tanks in RISA 3D vs Portland Cement Association Circular Concrete Tanks without Prestressġ) I'm not too familiar with the PCA publication. Should I be concerned that I am doing something wrong in RISA or is the book most likely a conservative approach to get the loads.Īny help on this would be greatly appreciative and thank you for any response. Also when I compare my flexure forces and moment forces in RISA vs the forces I would get in the Portland Cement Book, I am around 15%-30% less in RISA. Ld-c=length between corner d and c in plate (ft)Ģ.
Lb-c: length between corner b and c in plate (ft)Īnd the equation below would be my way of obtaining the moment I have to resist with vertical reinforcement. So the equation below would be my way of obtaining the ring tension force in my tank: So to calculate the ring tension force I would would need the fx+fxy and the length between corner b and c in my plate. So that means my fx+fxy force in my plates spreadsheet would represent the k/ft ring tension force in my tank. Currently all of my plates has their local x axis parallel to the ground and the local y axis perpendicular to the ground. I have a few questions about the plate forces in RISA?ġ. I am wanting to use RISA 3D to get my ring tension force and flexure force in my tank. This book provides different force coefficients for different situations of concrete tanks. In our office we typically design concrete circular tanks using the Portland Cement Association Circular Concrete Tanks without prestressing book.