Truss analysis problem.

  • Thread starter lecammm
  • Start date
  • #1
lecammm
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Homework Statement



As shown by the attachment we are given the distances and the 28kN force

Homework Equations



Relevent equations are equations of equilibrium;

ƩFy & ƩFx = 0;
ƩM = 0;

The Attempt at a Solution



First found By by summing the moments around point A;
(clockwise positive)
i.e.

ƩMa = (28*0.6) - (By*0.3) = 0

which gave By = 56kN

Next I summed the forces in the x direction and then took the sum of moments around the point "C", then tried to solve the simultaneous equations for Bx

However, this gave the wrong answer and I have no idea where to go.

Any help is great, thanks :D
 

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Answers and Replies

  • #2
Andrew Mason
Science Advisor
Homework Helper
7,722
430

Homework Statement



As shown by the attachment we are given the distances and the 28kN force

Homework Equations



Relevent equations are equations of equilibrium;

ƩFy & ƩFx = 0;
ƩM = 0;

The Attempt at a Solution



First found By by summing the moments around point A;
(clockwise positive)
i.e.

ƩMa = (28*0.6) - (By*0.3) = 0

which gave By = 56kN

Next I summed the forces in the x direction and then took the sum of moments around the point "C", then tried to solve the simultaneous equations for Bx

However, this gave the wrong answer and I have no idea where to go.

Any help is great, thanks :D
What is the moment about A of the force applied at C by the CB support? What does that tell you about the x component of force at C and at B?

AM
 

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