# Determine the reactions and draw the shear and bending moment diagrams for the beams shown in Figs. P13.9–P13.12 using the method of consistent deformations. Select the reaction at the interior support to be the redundant.

### Structural Analysis

6th Edition
KASSIMALI + 1 other
Publisher: Cengage,
ISBN: 9781337630931

Chapter
Section

### Structural Analysis

6th Edition
KASSIMALI + 1 other
Publisher: Cengage,
ISBN: 9781337630931
Chapter 13, Problem 12P
Textbook Problem
245 views

## Determine the reactions and draw the shear and bending moment diagrams for the beams shown in Figs. P13.9–P13.12 using the method of consistent deformations. Select the reaction at the interior support to be the redundant.

To determine

Find the reactions and sketch the shear and bending moment diagrams for the given beam using method of consistent deformation.

### Explanation of Solution

Given information:

Apply the sign conventions for calculating reactions, forces and moments using the three equations of equilibrium as shown below.

• For summation of forces along x-direction is equal to zero (Fx=0), consider the forces acting towards right side as positive (+) and the forces acting towards left side as negative ().
• For summation of forces along y-direction is equal to zero (Fy=0), consider the upward force as positive (+) and the downward force as negative ().
• For summation of moment about a point is equal to zero (Matapoint=0), consider the clockwise moment as negative and the counter clockwise moment as positive.

Calculation:

Show the beam as shown in the Figure 1.

Refer Figure 1.

Consider the horizontal and vertical reaction at A are denoted by Ax and Ay.

Consider the vertical reaction at B and C is denoted by By and Cy.

The reactions acting in the beam is 4.

The number of Equilibrium reaction is 3.

The degree of indeterminacy of the beam is 1.

Take the vertical reaction at B as the redundant.

Modify the Figure 1 as shown in Figure 2.

Refer Figure 2.

Consider a section at a distance x from both the supports A and C.

The deflection at B due to the external loading is denoted by ΔBO.

The flexibility coefficient representing the deflection at B due to unit value of redundant By is fBB.

Primary beam subjected to unit value of redundantBy.

Calculate the value of reaction at C as follows:

MA=0Cy×30+1×10=0Cy=13

Calculate the value of reaction at A as follows:

V=0Ay+Cy=1Ay+13=1Ay=23

Calculate the value of deflection fBB as follows:

fBB=1EI010(23x)2dx+12020(13x)2dx=1EI01049x2dx+1202019x2dx=1EI[(49×x33)010+(12×19×x33)020]=1EI[(49×1033)+(12×19×2033)]

fBB=1EI[148.1481+148.1481]=296.3kNm3/kNEI        (1)

Calculate the value of reaction at A and C as follows:

Ay=Cy=25×302Ay=Cy=375kN

Calculate the value of deflection ΔBO as follows:

ΔBO=1EI[010(375x25x22)(23x)dx+12020(375x25x22)(13x)dx]=1EI[010(250x2+50x36)dx+12020(125x2+25x36)dx]=1EI[(250×x33+50x424)010+12(125x33+25x424)020]=1EI[(250×1033+50×10424)+12(125×2033+25×20424)]

ΔBO=1EI[(250×1033+50×10424)+12(125×2033+25×20424)]=1EI[62,50083,333

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