I have an instance where ground floor is a composite steel floor so I have modeled it in RAM with a 2 ft story height. I am unable to understand that the base reactions for the load case do not sum to the loads applied (for example Wind in the X direction in this case). The story shear reported at Level 2 is 384.78 k which suddenly reverses direction with a magnitude of 1817.2 k at the ground level. The base reactions sum up to the ground floor story shear.
Can you please let me know the reason for this abrupt increase in the story shear at ground? Please refer the snip below for your reference.
Thank you.
