PEin2010
Well-known member
Reference: Question #506, Structural depth, NCEES 2000 sample problems and solutions.
The question is to calculate the maximum roof diaphragm service load chord force (kips). the wind load is given as 400 lb/ft. The plan of the roof is 192' x 120'.
The solution calculates wl^2/8 = 400*192^2/8 = 1843200 lb-ft, 1843200/ 120' = 15360 lb = 15.4 kips is stated as the answer. What i don't understand is that why is the wind load applied perpendicular to the roof? will the wind ever act like that?
If this is of any help: the figure shows the elevation and plan view of a single - story bldg with precast, prestressed double-tee wall panels and double-tee roof elements supported on the wall panels on the outside and on an inverted tee beam on the inside.
Thank you.
The question is to calculate the maximum roof diaphragm service load chord force (kips). the wind load is given as 400 lb/ft. The plan of the roof is 192' x 120'.
The solution calculates wl^2/8 = 400*192^2/8 = 1843200 lb-ft, 1843200/ 120' = 15360 lb = 15.4 kips is stated as the answer. What i don't understand is that why is the wind load applied perpendicular to the roof? will the wind ever act like that?
If this is of any help: the figure shows the elevation and plan view of a single - story bldg with precast, prestressed double-tee wall panels and double-tee roof elements supported on the wall panels on the outside and on an inverted tee beam on the inside.
Thank you.