So I am starting to learn for the final exam a bit early and I am trying to do this problem with a uniform beam which is reinforced with iron inside. I know how to calculate this if it wasn't for the reinforcement within the concrete. I know that the purpose of the iron reinforcement is to account for shear stress but I do now know how it involves in my equations or which equation I use. Can someone explain how to approach these kind of problems in general? Picture of the problem is in the link 1. The problem statement, all variables and given/known data So I am suppose to find the maximum force q so that the normal stress within the beam caused by momentum is within allowed constraints. qw is the weight of the beam and q is the external force applied physical properties of concrete: EC = 20GPa, tension σ t Y C = 3MPa and compression σ c Y C = 30 MPa. physical properties of iron Ei = 190GPa, tension σY i = 400MPa. density of the beam is γ = 24kN/m3 . moment of the inertia I = bh3/12 2. Relevant equations 3. The attempt at a solution I have done anything so far because I do not know where to start.