VIDEOClick to see full answer. In this regard, how do you calculate beam deflection?There is a range of beam deflection equations that can be used to calculate a basic value for deflection in different types of beams. Generally, deflection can be calculated by taking the double integral of the Bending Moment Equation, M(x) divided by EI (Young’s Modulus x Moment of Inertia).Likewise, what is acceptable deflection in a beam? Allowable deflection is generally expressed as a fraction of the span, in inches. All structural members will deflect or flex under load. The amount of flex depends on the magnitude of the load applied, span of the member, and stiffness of the member. Typically for better performing floors minimal defection is desired. Considering this, how do you find the slope and deflection of a beam? MOHR’S FIRST THEOREM: It is for finding Slope: It states that the difference of slopes between any two points on the loaded beam is equal to the area of the BMD between those two points divided by Bending Stiffness EI. MOHR’S SECOND THEOREM is for finding deflection.What is maximum deflection of a beam?Typically, the maximum deflection is limited to the beam’s span length divided by 250. Hence, a 5m span beam can deflect as much as 20mm without adverse effect.