Wind Design Considerations for Steel Joists and Joist Girders - SEAoT

More documents

Recommendations

Info

Joist Girder Bracing Placement40G8N7K Middle Girder @ 40’-0”Designed based on 2.62 k / PP Uplift Loading(vs. approximately 3.4 k / PP Uplift Loading fromcomponents and cladding joist reactions)No uplift design, i.e. net uplift load = 01 knee brace @ midspan to limit L/r yy < 240With 2.62 k / PP uplift load, same Bottom Chord angles 3 x 3 x 1/4,but now knee brace @ 15 ft. and 25 ft. required.With 3.4 k / PP uplift load, same Bottom Chord angles 3 x 3 x 1/4, butnow 3 knee braces @ 10 ft., 20 ft., and 30 ft. required.SEAoT State Conference November 6-8, 2008 Houston TX SEAoT - 92
Summary and Conclusions• Wind forces can have a significant impact on thedesign and use of steel joists and Joist Girders• The SJI Standard Specifications pertaining to windand uplift have been reviewed; the wind loadrequirements from ASCE 7-05 have been discussed;and the appropriate 2006 IBC load combinationscontaining Wind have been presented.• Particular attention needs to be paid to:• Code specified and calculated wind forces• Seat anchorage welds• Joist bridging and Joist Girder bracing placementSEAoT State Conference November 6-8, 2008 Houston TX SEAoT - 93
Page 2 and 3:
Introduction‣ Commercial manufact
Page 4 and 5:
Windstorm Damage to Roof in Texas05
Page 6 and 7:
Hurricane Charley Category 4 StormA
Page 8 and 9:
Population Trends in Hurricane-Pron
Page 10:
Roof Design to Resist Uplift Loads
Page 15 and 16:
2005 SJI Standard Specification for
Page 17 and 18:
2005 SJI Code of Standard Practice1
Page 20 and 21:
2005 SJI Code of Standard Practice6
Page 23 and 24:
2006 International Building Code•
Page 25 and 26:
Standards and Codes• 2005 SJI Sta
Page 27 and 28:
ASCE 7-05 Basic Wind Speed MapSEAoT
Page 29 and 30:
ASCE 7-05 Specified Wind LoadsSEAoT
Page 31 and 32:
ASCE 7-05 Specified Wind LoadsWhat
Page 33 and 34:
ASCE 7-05 Specified Wind Loads• M
Page 36 and 37:
Properly Applying Wind Loads toStee
Page 38 and 39:
Properly Applying Wind Loads toStee
Page 41 and 42: Wind Design Considerations forSteel
Page 43 and 44: Wind Design Considerations forSteel
Page 45 and 46: Properly Applying Lateral Loads toS
Page 47 and 48: Properly Applying Lateral Loads toS
Page 49 and 50: Typical Roof Framing using K-Series
Page 51 and 52: Profile of SJI Standard K-SeriesOpe
Page 53 and 54: Joist Seat Test Program Parameters
Page 55 and 56: Experimental Test SetupINSTRUMENTAT
Page 57 and 58: Typical Load-Deformation BehaviorTe
Page 59 and 60: Yield Line PatternsShort and Long A
Page 61 and 62: Yield Line Analysis Using Virtual W
Page 63 and 64: Research Programs Recommendations
Page 65 and 66: 2005 SJI Standard Specification for
Page 67 and 68: P n = 2 M p L yl / aASD Design Proc
Page 69 and 70: Recommended Bearing Seat Designto R
Page 71 and 72: Recommended Bearing Seat Designto R
Page 77 and 78: Design ExampleDimensions:Length, l
Page 79 and 80: Design ExampleBasic wind speed, fro
Page 81 and 82: Steel Joist and Joist Girder Layout
Page 83 and 84: Steel Joist Design20K6 Rod Web @ 40
Page 85 and 86: Steel Joist DesignDesign DataEnd We
Page 87 and 88: Placement of Bridging to ResistUpli
Page 89 and 90: Placement of Bridging to ResistUpli
Page 91: Placement of Bridging to ResistUpli
Page 95: Any Questions?SJI Website: http://w
show all

Wind Design Considerations for Steel Joists and Joist Girders - SEAoT

Create successful ePaper yourself

Delete template?

Save as template?