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Civil Engineering PE

Category - Material Mechanics

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Which of the following conventions is used to indicate tension on a truss diagram?

Drawing arrows away from the pins
Drawing arrows towards the pins
Adding the tau symbol to the diagram near the truss member in tension
None of the above

Explanation

Answer: A - The convention used to indicate the tension on a truss diagram is to draw arrows away from the pins. To indicate compression on a truss diagram, arrows are drawn towards the pins. Sometimes, the directions of the forces acting against a given pin are not known and have to be assumed. If a negative value results from a Method of Joints computation used to find forces, you know that you have made an incorrect assumption.

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