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When you use the FDOT provision, program uses the theta angle, draw a line, to the support and calculate the area of shear reinf. under this. It may be more conservative in some cases.
If the user does not select the FDOT alternative option then the program just considers the area of shear reinforcement. at the section under consideration. Let’s say if the user is looking at a section 4' from the end. Program will simply look at the area of the shear stirrups provided at the distance