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

What is EI in Civil Engineering | What is meant by EI constant in a given structure... EI is the product of the materials modulas of elasticity (E)...

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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