What is EI in Civil Engineering | What is meant by EI constant in a given structure

What is EI in Civil Engineering

    EI is the product of the materials modulus of elasticity (E) and the elements second moment of area (I).

    • E” is a function of how stiff the material is.
    • I” is a function of the elements shape.
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    What is meant by EI constant in a given structure

    The EI value defines how stiff a structure is.

    For example in an EI of the simple concrete beam with width b and depth d, the value of I is equal to b*d^3/12.

    The deflection can be calculated as 5/384 * w*length^4 / EI.

    In this example, the variables are 

    • The span of the beam (length), 
    • The weight that the beam carries (w),
    • The beam properties (EI). 

    The EI constant is often an expression in the engineering world to explain the stiffness of a structural element. E is the Modulus of Elasticity, and I is the second moment of inertia.

    EI is most often used in FEM (Finite Element Modeling). This expression is a fundamental building block for analyzing complex structures and is a property for many FEM elements (Beams, Bars, Rods, etc.)

    Also ReadWhy are I beams shaped like an I?

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