This is a quick diagram of a Truss Bridge I need to calculate the forces of. It

Question

This is a quick diagram of a Truss Bridge I need to calculate the forces of. It is 1 metre in length therefore each part is 20cm wide. The read lines are the weights that were applied of 113N at each othe the four points B,C,D and E).

Ultimately I must calculate the maximum force each member can hold.

I am completely stuck as to how to find the answer. How would I go about determing how much each member can hold?

Explanation / Answer

For this problem you can use a relatively straightforward, repeatable procedure such as: Consider vertical forces at B, Neither AB or BC can provide any no matter what their tension or compression is, so the vertical component of BH (tension) must equal the weight hanging under B. Since lengths are given, BH must be at a 33.69 angle from vertical, so Tbh*cos(33.69)=113N => Tbh = 135.81 N (tension in BH) By symmetry, EG will have the same tension. Repeat the same steps summing vertical forces at C to find Tch and Tdg. With those 4 tensions it would be relative trivial to sum force components at other points to find the remaining loadings.

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