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Steel truss arch roof of a train station?

Hello,

I am stuck on the answer to the following statements:

1) The overall static structure is:

a) statically indeterminate (or hyperstatic)

b) statically determinate (or isostatic)

2) The overall static structure is:

a) an arc with 3 joints

b) a frame

3) The truss sets are

a) compressed

b) bended

4) The diagonals of the trusses are

a) stretched (tension)

b) compressed (compression)

5) The diagonals of the trusses are

a) embedded (welded/fixed)

b) hingedThe answer is either A or B. Only one answer is possible.

Thanks a lot!

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