.

4.2 (A) Md. Al - Munim 08.01.03.068

CE.416 ( pre-stressed concrete lab)

Objective

Influence line of shear for determinate structure : Determinate max/min shear due to moving load.

The structure which can be completely analyzed by static equilibrium equation are called determinate structure.

Determinate structure :

Definition : An influence line is a plot of the magnitude of the resulting reaction/axial force/shear/moment generated in a beam or structure as a unit load travels across its length. Influence lines can be generated for any of these actions (reactions, axial forces, shears, or moments) in a structure.

Introduction to Influence Lines

Influence lines are used to determine where to place moving loads on a structure to obtain maximum results (reactions, shears, moments, axial forces), and to compute these reactions or other actions (shears/moments/axial forces) once the loads are placed in critical positions.

why we use Influence Lines

A typical influence line

A typical influence line

A typical influence line

Influence line of moving load

Influence line of moving load

Influence line of moving load

Influence line of moving load

Shear due to moving load

Shear due to moving load

Shear due to moving load

Shear due to moving load