Section Modulus Units

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Section modulus units. Section modulus is a geometric property for a given cross section used in the design of beams or flexural members. The ratio of moment of inertia of beam section about neutral axis and the distance of extreme fiber from neutral axis. The plastic section modulus for a rectangular cross section can be determined by multiplying each section half e g the shaded area shown in figure 1 50 by the distance from its centroid to the centroid for the whole section.

Any relationship between these properties is highly dependent on the shape in question. Section modulus depends only on the cross section shape of the beam. S x s y a 3 6 1 where.

Cross section shapes like rectangular square circular i section and t composite section etc. Y axis m 3 cm 3 ft 3 in 3 a square side distance m in ft converter. S elastic section modulus related to bending around x vs.

Here i is moment of inertia and y is distance from neutral axis to top or bottom of fiber. Other geometric properties used in design include area for tension radius of gyration for compression and moment of inertia for stiffness. It is denoted by z and is given as z i y here i moment of inertia mm 3 or cm 3 is the si unit of sectional modulus.

Any relationship between these properties is highly dependent on the shape in question. Z x b h 2 h 4 b h 2 h 4 bh 2 4. Other geometric properties used in design include area for tension and shear radius of gyration for compression and moment of inertia and polar moment of inertia for stiffness.

There are two types of section moduli the elastic. For a simple solid square the section modulus can be expressed as. Section modulus is a geometric property for a given cross section used in the design of beams or flexural members.