Adding new roof top units to existing roof
Adding new roof top units to existing roof
(OP)
Dear eng-tippers,
When adding new roof top units to an existing roof, what analysis/design methodology do you follow?
I understand that the general consensus would be to check if the stress increase is 5% or less as per the IBC, and if so, no member evaluation/strengthening would be required. Should the applied stress increase by more than 5%, member evaluation/strengthening would be required.
However, I am following the Canadian code and I cannot seem to find a similar allowance or relaxation. My strict interpretation of the Canadian code is that ANY increase, however small, requires a full evaluation. This seems rather impractical and unreasonable, especially if one is required to evaluate an existing building’s lateral load resisting system.
Any help or suggestions would be appreciated. Thank you.
When adding new roof top units to an existing roof, what analysis/design methodology do you follow?
I understand that the general consensus would be to check if the stress increase is 5% or less as per the IBC, and if so, no member evaluation/strengthening would be required. Should the applied stress increase by more than 5%, member evaluation/strengthening would be required.
However, I am following the Canadian code and I cannot seem to find a similar allowance or relaxation. My strict interpretation of the Canadian code is that ANY increase, however small, requires a full evaluation. This seems rather impractical and unreasonable, especially if one is required to evaluate an existing building’s lateral load resisting system.
Any help or suggestions would be appreciated. Thank you.






RE: Adding new roof top units to existing roof
BA
RE: Adding new roof top units to existing roof
M.S. Structural Engineering
Licensed Structural Engineer and Licensed Professional Engineer (Illinois)
RE: Adding new roof top units to existing roof
RE: Adding new roof top units to existing roof
RE: Adding new roof top units to existing roof
Sorry to state the obvious.
RE: Adding new roof top units to existing roof
RE: Adding new roof top units to existing roof
M.S. Structural Engineering
Licensed Structural Engineer and Licensed Professional Engineer (Illinois)
RE: Adding new roof top units to existing roof
RE: Adding new roof top units to existing roof
RE: Adding new roof top units to existing roof
Mike McCann
MMC Engineering
http://mmcengineering.tripod.com