Find the reactions the pin A and roller D exert on the truss

AI Thread Summary
The discussion focuses on determining the reactions at pin A and roller D of a rigid truss under specified loads. The participant questions the assumed direction of force at pin B, suggesting a 45-degree angle downward and to the left, while clarifying that no external load is applied at that joint. The conversation highlights the importance of accurately summing moments and forces to solve for reactions. Additionally, there is a correction noted regarding the last two terms in the moment equation about point A. Accurate calculations are essential for finding the correct reactions in the truss system.
pb23me
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Homework Statement


The rigid truss supports the loads shown. Find the reactions the pin A and roller D exert on the truss.
All concentrated loads act on the pins joining the truss members

Homework Equations


ƩMa= -5ft(3kips)-10ft(2kips)-.707(1kip)10ft+Dy(15ft)
Dy=2.80 kips*ft

The Attempt at a Solution


My question is just regarding pin B. Am I supposed to assume some force is going down and to the left-45 degrees-at this location?
 

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The truss members are supporting axial loads only.
 
And don't assume any loading at joint B, since there is no force applied there. Your last 2 terms in your sum of moments about A = 0 equation are also not correct.
 
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