Wind Base Shear Calculations

1
Wind Base Shear Calculations

• The wind base shear is calculated using the 1997
  UBC equation 20-1 (PCeCqqsIw)
• P Wind Pressure
• Ce Combined Height, Exposure, and Gust
  Coefficient
• Cq Pressure Coefficient
• qs Wind Stagnation Pressure
• Iw Importance Factor
• Coefficients are obtained based on the fact that
  the structure is a classroom building with an
  occupancy of more than 500
• located on a college campus in Spokane, WA

2
Construction Document Phase

• Members will be designed based on the following
• Applicable Loading
• Ease of Placement
• Standard Sizes Available
• Cost Analysis
• All members and typical connections will be shown
  in detailed AutoCAD drawings
• All documents will be compiled and organized.

3
Column Placement

• Column placement was based on the following
• Location of architectural gridlines
• Placement that allows for continual columns
  through all three floors
• Ability to easily place beams and joists between
  columns

4
Beam Placement

• In most cases beams span from column to column in
  order to transfer the gravity loads down to the
  foundation
• Beams placed in the moment frames transfer axial
  loads to the lateral resisting system
• Beams placed along the wall of the building pick
  up load from the exterior elements such as
  architectural features and some interior loads

5
Transfer Beams

• Due to the following cases the design team has
  decided to use transfer beams to transfer the
  load from one beam to two columns
• The building is not symmetrical
• Several architectural features make it impossible
  to connect every beam to a column

6
Conclusion

• The placement of beams and columns was completed
  rather quickly. Gravity loads and lateral loads
  were also relatively simple to calculate using
  local guidelines along with the 1997 UBC.
• The lateral system has been chosen as a moment
  frame.
• Roof design and the auditorium have posed some
  problems. The roof will most likely be
  supported by trusses. The load above the
  auditorium will either be supported by cantilever
  or by spanning two large beams over the
  auditorium.
• Both the schematic and design development phases
  are nearly complete and the group expects to
  begin the design document phase soon.