Measure stress in bolts

Hello,

I am a student working on a project. And i am doing a simulation of a light pole connected to a house wall. So that the load of the light unit at the top is perpendicular to the bolts.

I have not modeled the bolts, but instead made a hole were the bolts are supposed to be. And made an contact surface (bolt head), were i constrained it (fixed ,x,y,z)

Can it be done like this?

Bertil