![]() How do you find the section modulus of an irregular shape?Įven if a shape does not have a pre-defined section modulus equation, it’s still possible to calculate its section modulus. Therefore, the required section modulus to achieve a safety factor of 2 in bending is calculated as shown below:įor this example problem, the required section modulus is 6.67 in3. Rearrange the equation from the beginning of this post into the following form:Ī36 steel is equal to the yield stress of 36,000 psi. Calculate the required section modulus with a factor of safety of 2. Consider the following example:Ī beam made from A36 steel is to be subjected to a load of 120,000 lbf-in. The required section modulus can be calculated if the bending moment and yield stress of the material are known. Y = the distance from the neutral axis to the outside edge of a beam What is the required section modulus? I = the area moment of inertia (or second moment of area) The general formula for elastic section modulus of a cross section is: The elastic section modulus of C-channel is calculated from the following equation: Section Modulus of a Rectangle Calculator Consistent units are required for each calculator to get correct results. Use the calculators below to calculate the elastic section moduli of common shapes such as rectangles, I-beams, circles, pipes, hollow rectangles, and c-channels that undergo bending. Section modulus is used in structural engineering to calculate the bending moment that will result in the yielding of a beam with the following equation:īeams in bending experience stresses in both tension and compression. Often, “elastic section modulus” is referred to as simply “section modulus. Elastic section modulus applies to designs that are within the elastic limit of a material, which is the most common case. ![]() There are two types of section moduli: elastic section modulus and plastic section modulus. ![]() ![]() The units of section modulus are length^3. Section modulus is a geometric property of a cross section used in the design of beams or other flexural members that will experience deflection due to an applied bending moment. ![]()
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