Capacity Ratio
Capacity ratio is a term used here to determine the structural Demand/Capacity of the reinforced concrete section. The Demand is the resultant factored bending moment obtained from the analysis of the pile at a certain level and Capacity is the structural factored calculated bending moment capacity at an axial load level equal to the same applied at that section.
The capacity ratio is calculated over the pile length at all of its reinforced concrete sections. To calculate the Capacity Ratio:
- Select Home > Project Settings
- Go to the Interaction diagrams tab.
- Select the Capacity Ratio checkbox.
This section also allows users to chose if factored moments and axial loads are used to construct the interaction diagram.
The results of the capacity ration are plotted graphically or tabulated along the pile length just like any other result when you press or any other way to show the pile analysis results. It can also be shown in the contour presentation on the main layout.
Capacity ratio 0 to 1.0 are acceptable. Ratios above 1.0 mean the pile is failed. As the analysis depends on unfactored capacity it may not diverge at a ratio of 1.0 but continues further. That is why Capacity Ratio check is important when analyzing reinforced concrete sections.