
Concept explainers
The forces in the member from method of joints.
Answer to Problem 5.1P
Explanation of Solution
Given:
Two reactions at the pin support is Ax and Ay.
At roller support one reaction is Cy.
Force on the member
Free body diagram of the truss.

Taking moment about A
From equilibrium equations
Considering joint A

From the equilibrium equation
Considering joint C

Conclusion:
Forces in the member
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