The hole that you are proposing to cut is not that large. Of course the strength of the slab will be reduced, but I do not see why there would be a problem redistributing the load to other slab strips. The main problem is the reinforcing ratio. You will probably have to assume the min...
CottageGuy,
In the case of a wide flange beam, you cannot use the Polar Moment of Inertia as Ix+Iy. This method only works in closed sections, such as pipes and tubes. In fact you will need to use the torsional constant (J). for a wide flange this is (you will find that the torsional...