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Structural Analysis

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

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Section
BuyFindarrow_forward

Structural Analysis

6th Edition
KASSIMALI + 1 other
Publisher: Cengage,
ISBN: 9781337630931
Chapter 3, Problem 29P
Textbook Problem
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Determine the reactions at the supports for the structures shown.

Chapter 3, Problem 29P, Determine the reactions at the supports for the structures shown. FIG.P3.29

FIG.P3.29

To determine

Calculate the support reactions for the given structure.

Explanation of Solution

Given information:

The structure is given in the Figure.

Apply the sign conventions for calculating reaction 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:

Let Ax and Ay be the horizontal and vertical reactions at the hinged support A.

Let By, Cy, and Dy be the vertical reaction at the roller support B, C, and D.

Sketch the free body diagram of the structure as shown in Figure 1.

Use equilibrium equations:

Summation of forces along x-direction is equal to 0.

+Fx=0Ax=0

Therefore, the horizontal reaction at A is Ax=0_.

For the member AE, the summation of moments about E is equal to 0.

MEAE=0Ay(15)+12(2)(15)(13×15)=0Ay(15)+75=0Ay=5k

Therefore, the vertical reaction at A is Ay=5k_.

For the member DF, the summation of moments about F is equal to 0.

MFDF=0Dy(15)12(2)(15)(13×15)=0Dy(15)75=0Dy=5k

Therefore, the vertical reaction at D is Dy=5k_

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Structural Analysis
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