Geometry in a Truss: Find Internal Forces & X

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To determine the internal forces in a truss, it's essential to first calculate the reaction forces, typically starting with the moment at the pin support to find the roller support reaction. The key to finding the unknown 'x' lies in understanding the geometry of the truss, specifically needing the vertical height or the pitch angle of the roof. Without this information, it can be challenging to proceed with the calculations. Observing the triangle formed by the truss members can provide insights into the necessary dimensions. Properly identifying these geometric elements is crucial for solving the problem effectively.
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I'm to work out the internal forces in this truss. I know to get the reaction forces first, so I take the moment at the pin support to find the reaction at the roller support. I can't get my head around at how to find x through the geometry to add that force to the moment though. Is there not enough information in the diagram to find it? Or am I missing something simple?
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Yes you need the 'rise' or vertical height of the truss as well as the span. Alternatively you need the pitch (angle to the horizontal) of the roof.

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Look at the truss carefully. What kind of triangle is formed by the members in the center of the truss?
 
Look at the truss carefully...

Well spotted steamking you are spot on.
 
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