Dear eng, Pls ans quickly Thanks Q3A roof truss member is subjected to four external forces acting at joints of a truss as shown inFigure Q3.(b)(c)Determine the force of P when a is equal to 60° which creates total moment of zero atjoint A.Using force P obtained from Q3(a), replace all given forces by an equivalent resultantforce at joint C and sketch the direction of the forces.Determine the smallest force of P acting on the truss if the resultant couple moment atjoint C and D has the same magnitude. 3 mAC2 m400N2 mFIGURE Q3600N200N2 mBPα

Answered: Image /qna-images/answer/ea226ac7-0275-4b3e-af63-f757209975e9.jpg

Answered: 3 m C A 2m 400N 2m FIGURE Q3 D 600N…

Engineering

Civil Engineering

3 m C A 2m 400N 2m FIGURE Q3 D 600N 200N 2 m B P α

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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Question

Dear eng, Pls ans quickly Thanks

Q3
A roof truss member is subjected to four external forces acting at joints of a truss as shown in
Figure Q3.
(b)
(c)
Determine the force of P when a is equal to 60° which creates total moment of zero at
joint A.
Using force P obtained from Q3(a), replace all given forces by an equivalent resultant
force at joint C and sketch the direction of the forces.
Determine the smallest force of P acting on the truss if the resultant couple moment at
joint C and D has the same magnitude.

3 m
A
C
2 m
400N
2 m
FIGURE Q3
600N
200N
2 m
B
P
α

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Step 1: All the forces are given in diagram and force P is calculated into its horizontal and vertical comp.

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Step 2: Now assume a force F at an angle theta with horizontal towards left at joint C and use equilibrium m

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Step 3: In this step we will equate the moment at C and D

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