If you have have keen interest in the structures than this post ‘**General bending theory Explained PTU Notes**‘ is going to help u a lot.Basic knowledge of structure starts with understanding of such basic theory.Let us start with this article** General bending theory Explained PTU Notes.**

Table of Contents

** General bending theory Explained:-**

**Moment Of Inertia:-**

Very basic term of **General bending theory Explained PTU Notes **article is **Moment**** of inertia.Â **It is the mass property of a rigid body. It is basically the measure ofÂ torqueÂ needed for getting aÂ angular acceleration about an axis of rotation. It depends on the shape and size of the body.Moment of inertia can be different around different axes. if there is larger moment of inertia around aÂ axis it means that it requires more torque to increase or stop the rotationÂ the rotation, of a body about that axis.

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**General Bending Theory:-**

The second basic thing ofÂ **General bending theory Explained PTU Notes ** post is general bending theory.The ideal beam is basically a beamÂ with the least cross-sectional area. Thus itÂ require the least material. least cross-sectional area is needed to achieve a given section modulus. Since the section modulus depends on the value of the Moment of Inertia.A beam is efficient beam if itÂ have most of its material located as far from the neutral axis as possible. The more farÂ a given amount of material is from the neutral axis, the greaterÂ is the section modulus. Hence at lastÂ larger bending moment can be resisted by the member.

When designing beam to resist stresses due to bending the usual starting point is the required section modulus. If the allowable stress is ?max and the maximum expected bending moment is Mmax. , then the required section modulus is given by

Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â **Â S = Maximum bending moment/maximum stressÂ = I/c**

where is I the moment of inertia of the beam cross-section and is c the distance of the top of the beam from the neutral axis