Which of the following statement is correct in connection with the designing of jack arch roof?

- 1
  
  The deflection of beams should not exceed 1/480 of the span.
- 2
  
  The thickness of arch shall not be less than 10 cm.
- 3
  
  The spacing of the tie rods should not exceed 20 times the width of rolled steel beams.
- 4
  
  all of the above

Display Comments

Leave a comment

Login at first then you can submit comment. Click here to login.