20-101386-CO-Building A Structural Calculation Adendum-05-05-2022-V1Structural Calculation
Addendum
For
IRG Greenline Building A
Federal Way, WA
Project # 2180307.20
Project Principal Danial L. Booth PE SE
Sr. Engineer Larry Higgins PE
Design Criteria
Design Codes and Standards
Codes and Standards: Structural design and construction shall be in accordance with the
applicable sections of the following codes and standards as adopted and amended by the local
building authority: International Building Code, 2015 Edition.
Structural Design Criteria:
Live Load Criteria:
Roof (Min Blanket Snow)25 psf
Slab on Grade 250 psf
Wind Load Criteria:
Ultimate Wind Speed 110 mph
Risk Category II
Wind Exposure B
Topographic Factor 1.0
Seismic Criteria:
Risk Category II
Seismic Importance Factor 1.0
Ss = 1.279 S1 = 0.491
Sds = 0.853 Sd1 = 0.428
Site Class = E
Seismic Design Category = D
Response Modification Coeff. (R): 5.0
Seismic Response Coeff. (Cs): 0.171
05/05/2022
Soil Criteria:
Based on Geotechnical Engineering Report by: GeoEngineers, dated March 9, 2017.
Allowable Soil Bearing Capacity: 4000psf, allow 33% increase for loads from wind or seismic
origin.
Active Earth Pressure = 35pcf (un-restrained) / 55pcf (restrained
Friction Coefficient = 0.35 (SF=1.5)
Passive Pressure = 300psf (SF=1.5)
Project Description
The project consists of standard single loaded concrete tilt warehouse/distribution building. The
walls consist of concrete tilt bearing walls, steel joist and joist girders, wood purlins and plywood
sheathed roof.