Question:The composite design on the attached bridge is flagging the shear studs, specifically on the pitch. The formula 6.10.10.1.2-5 result is very high (77.458 kip/in). I would like to understand how the program is calculating Frc, which comes out to be 77.458kip/in*48in = 3717.984kip. AASHTO commentary indicates that in lieu of a refined analysis, Frc may be taken as 25kip.
The units shown on the Excel output for Ffat1 and Ffat2 should be kip/in and not ksi/in.
Answer:Program does not calculate Frc, but We can manually input the value of Frc at shear connector definition. See the below figure.
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After providing the value of Frc manually as 25, shear connectors seem to be adequate. PFA the revised design report. We have taken note of correction on units from ksi/in to kip/in. It is corrected in latest Midas civil version. Also, PFA the AASHTO design guide for midas Civil, to understand how the program performs the design.