Physics Help Forum calculating forces in a truss, method of joints

 Kinematics and Dynamics Kinematics and Dynamics Physics Help Forum

 Apr 8th 2012, 07:00 PM #1 Junior Member   Join Date: Apr 2012 Posts: 1 calculating forces in a truss, method of joints The question is to calculate the forces ina ll members of the trussnby method of joints. First i have calculated the reaction forces for A and B by taking the moment from both these points. These came too: Ay=65N and By=55N I do not know where to go from here, what point should i analyse first, i tried analysing point H however i am not sure how i should go about this, is F_hj equal to zero. and would CH equal to the force of AC. Please help i am lost. i just need to know how to start, so maybe could you just help me solve two points and i can probably finish the rest. thank you for your time. Attached Thumbnails   Last edited by jaxta; Apr 8th 2012 at 09:41 PM.
 Apr 17th 2012, 12:30 AM #2 Member   Join Date: Oct 2010 Location: Sri Lanka Posts: 63 For these kind of questions you can go for the following method break the truss into two parts where you'll end up breaking maximum three rods. mark there forces. Now write three equations for the equilibrium of one of the parts in this case I would write $\Sigma F_y=0$, $\Sigma G_D=0$ and $\Sigma F_x=0$. Now solve for unknown three forces Attached Thumbnails

 Tags calculating, civil engineering, forces, joints, mechanis, method, statics, structures, truss

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