Question

1. Your team is designing the lateral load-resisting system for a two-story office building. To do so, you need to determine the wind loads on the lateral load-resisting elements. At this preliminary stage, consider the floor and roof diaphragms to be flexible, and consider the wind pressure to be uniform. Note that the south and east walls have been cut away so that we can see the system supporting them. 1. When the wind blows from the south, it creates a uniform pressure of 30 psf on the south elevation. a. Convert the applied wind pressure into line loads that act at each diaphragm level on the windward side. b. Then convert the line loads into point loads that act at the locations where the diaphragms meet the lateral load-resisting elements. II. When the wind blows from the east, it creates a uniform pressure of 20 psf on the east elevation. a. Convert the applied wind pressure into line loads that act at each diaphragm level on the windward side. b. Then convert the line loads into point loads that act at the locations where the diaphragms meet the lateral load-resisting elements.

Answer 1

Solution I wind us blowing from south, a corneat applied wind to lino, socks at each diaphragm ilevel mnuin demand side. ROU ). .. Given windpresme = 20pst. - wind line losed on floor diaphragm (sterrey) =(80x150) +(30 x ) = 480.p/f twind dine doad on floor diophiago 8kreyz) =ox tą) +30x - 2 270 p/f b) Canvort eline load tecpoint food et junction = q diaphragm & deftial load yvisting System : 24802 - Point load on column frame on grid 2 s 480x -cat first storey - 9x 2,80 + (28x15) 2 11520 Pounds at second sterere9x220 7 (240x\s) : 6480 pounds

Point load on Column Hameanguid © At fight spreye (480xls) † 20. + (480x 15 ) 2 Tosoo pound At second sterey (220 x 15) +(270x15) = 6oas pounds

4 a Pont cload on tame on grida At first spree 2 480x S +480x) = 4088 Pounds DA Second Storey = 270X15 + (270x1) 2 2293 Pounds 52_ AR

11 wind is blowing from eand; Prestue = 20 psf PIR .: wind line load at first storey = 4800lm .. wind line load second story = 270818. into point bad, convecting the lineload

rame on grid Actors ligst = 4480x gs + Clx480) oferey - 1800 pounds Second. 270Xgos + Cixade) Storey = 2910 pounds frame on grid B = first sterey =480x9+ 480x25 a = 10320 Pounds 2 second storey bus 220x9 + 270x25 = 5805 Pounds Pramem gridco first storey480x25_+ Llxuda) = 6480 Pounds second storey: 200x 25 + (1x270) - 3645 Pounds ay 2

- Second - Storey bulo Piret strey 11520 x 10500X 3645 sros + 1291 2910 ani 6480 At 10320 10320 All forces in Pounds.