Structures

Question 1

Zero force member rules:

Answer 1

If no loads or pins / rollers then
1) angle == 180 then zero force member
2.) collinear situation ((180) if one is zero then other is zero
3.) collinear members (180) with third member sticking out then third member is zero force member

Question 2

How to calculate tangent length (horizontal curve)

Answer 2

PI - PC