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Hello everyone.
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In this lesson, we're analyzing a statistically determinate trust to find the internal forces in its members and determine whether their intention or compression.
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We'll use the method of joints, apply static equilibrium principles, and proceed joint by joint.
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First we calculate reactions as supports.
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We start by summing moments about point d to solve for the vertical reaction at point a.
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Then we'll find d .y from equilibrium.
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We sum vertical forces for d .y.
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Using a sum of f y equals 0, we sum all vertical forces to find the reaction at d.
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We analyzed joint a for members.
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We break down forces into x and y at joint a, treating f -af as acting diagonally.
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Next, we analyze joint d for members.
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Joint d has diagonal and horizontal members, resolved with trig functions from the 30 -degree angle...