Floor Load Deflection Calculation

Two different types can be applied in the calculator.
Floor load deflection calculation. This deflection is calculated as. I planar moment of inertia m 4 in 4. Enter your floor joist information and then hit calculate deflection to find out your floor rating. The deflection calculator provides several engineering specifications such as the moment of inertia and yield strength to determine deflection.
Downward loads tend to deflect the beam downwards. Loads can be in the form of a single point load linear pressure or moment load. The formulas in this calculator only focus on either the downward or upward. As a result the live load dead load and distribution of forces are different.
Loads should be determined in accordance with this chapter. It is important to list live load dead load and total load separately because live load is used to compute stiffness and total load is used to calculate strength. Distributed loads are specified in units of force per unit length kn m or plf along the beam and can be applied between any two points. A typical wood frame floor covered with carpet or vinyl flooring has a dead load of about 8 pounds per square foot.
If there s wall board covered ceiling suspended from the underside of that floor the dead load increases to about 10 pounds per square foot. So these are the limits set by the code. Loads on the other hand affect the beam s deflection in two ways. The dead load on a floor is determined by the materials used in the floor s construction.
And l 180 for unplastered roof construction. You also have options depending on the expected configuration of your solution. Q force per unit length n m lbf in l unsupported length m in e modulus of elasticity n m 2 lbf in 2. The direction of the deflection and the magnitude of the deflection.
Therefore the start and end magnitudes specified by the user must be the same. The code section on working load deflection states. Chapter 3 of the international residential code irc provides the maximum allowable deflection for a given structural member floor roof wall etc. 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. The deflection of floor and roof assemblies shall not be greater than l 360 for plastered construction. To generate the worst case deflection scenario we consider the applied load as a point load f at the end of the beam and the resulting deflection can be calculated as. Whether there will be one fixed end two fixed ends or the load will be supported on both ends.
This house is identical to our first example except it is stick built. This calculator is designed to work with dimensional lumber only. If you have engineered truss or i beam type joists please do not use this calculator. Uniform loads have a constant magnitude along the length of application.