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Module 1 : Introduction : Review of Basic Concepts in Mechanics

Lecture 1 : Introduction



	(a) 2-dimensional structure		(b) 3-dimensional structure
	Figure 1.4 2-dimensional and 3-dimensional model of structures
	Similarly loads are also put into different categories, based on various criteria:
	a(a) Based on the source/origin: Wind load, earthquake load, self weight, live load, blast load, temperature stress, etc.
	a(b) Based on the direction of action: Gravity loads, lateral loads, etc. (Figure 1.5)
	a(c) Based on time-variation: Static, dynamic, impulse, pseudo-static, etc.
	a(d) Based on the mode of action/analysis point-of-view: Concentrated or point load, distributed load, moment, pressure, aaaaetc. (Figure 1.6).

aaaa(a) Lateral loads			aaaa(b) Gravity loads
Figure 1.5 Load types based on direction of action

(a) Concentrated or point loads on		(b)	Distributed loads on a simply
a simply supported beam			supported beam


(c) Pressure acting on inner surface of a cylinder
Figure 1.6 Load types based on analysis point of view