STILL cant work out trusses. (1 Viewer)

[aimre]

Hi,
i really need help. No matter how many times ive asked, what books i've read, i still got NO idea on how to get the forces in members in a truss and their state. Can someone plz help

thanks :worried:

 

[fakingtheday]

add me to msn: bleached_lithium@hotmail.com

i'll run you through everything

 

[PimpPyro]

Simple if your logical

Well you have two options,
Method of sections
Method of joints

Method of sections is generally the quicker and simpler method.
Basically you imagine you cut the truss.
Every cut members now acts as an external force.
Take sum of the moments that cancels out the other unknown external forces (if possible - most the time is)
Using sum of the moments calculate the unknown!

 

[fakingtheday]

Always use method of joints if the member is at the end of the structure though.