Problem 404 Roof Truss - Method of Joints

Problem 404
Determine the forces in the members of the roof truss shown in Fig. P-404.
 

404-roof-truss.gif

 

Solution 404

 
chubbzz20

I think the solution is wrong. Please verify

Jhun Vert
Jhun Vert's picture

May you point it out?

chubbzz20

i could be wrong but when you calculate for the summation of moment in the solution there is no 450cos30 degrees...since you need all the forces added x and y.

Jhun Vert
Jhun Vert's picture

I get what you mean and I read again the solution. As far as the steps, everything is fine.

MATHalino
MATHalino's picture

In summation of moment at A, the 450 N force was resolved into components at point D, not at B. That is why there is no 450 cos 30°.

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