# Method of Joints: Tension or Compression

(a) Find the reactions A and D {see attachment for diagram}

(b) Use the Method of Joints to determine the force in each member. Indicate the magnitude of the force whether the member is in tension or compression.

https://brainmass.com/engineering/mechanical-engineering/method-joints-tension-compression-29212

#### Solution Preview

Will apply the method of joints, using equilibrium to analyze the joints until we determine the forces in all members.

We first draw the free-body diagram of the whole truss. From the equilibrium consideration (sum of forces = 0.0, sum of moments around any point = 0.0) then:

The axial force at A .... Ax = 0.0.

Dy is the force in y direction at joint D

Dx is the force in x direction at joint D

Dx = 0.0 (this a moving joint in x direction)

Taking the sum of moments around A. ...

#### Solution Summary

This solution includes calculations and explanation. 280 words.