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Louisiana Tech UniversityCollege of Engineering & Science
Transportation Design Water Resources Gas StationBridge Corridor
Gas Station DesignBy: Dinesha Kuruppuarachchi, Suganya Soundararajan, Fatima
usmona
May 2015
Louisiana Tech UniversityCollege of Engineering & Science
Transportation Design Water Resources Gas StationBridge Corridor
• Located in Shreveport, LA, off I-49• According to Shreveport Zoning:– Highway Business District
• Design for three structures:– Store– Canopy– Sign Board
Louisiana Tech UniversityCollege of Engineering & Science
Transportation Design Water Resources Gas StationBridge Corridor
Site visit investigation…
Louisiana Tech UniversityCollege of Engineering & Science
Transportation Design Water Resources Gas StationBridge Corridor
Store• Area 1600 ft2 square shape 40x40ft• Height 15ft• Fire Resistance rating: – Construction TYPE II-B, Unprotected Non-Combustible
• International Building Code: – Mercantile Group M
Louisiana Tech UniversityCollege of Engineering & Science
Transportation Design Water Resources Gas StationBridge Corridor
Roof Design - Flat RoofThe structural steel framing with a steel decking and joist system. – Weather conditions– Ease of fabrication– Less cost
Louisiana Tech UniversityCollege of Engineering & Science
Transportation Design Water Resources Gas StationBridge Corridor
Canopy• Area 2800 ft2, rectangular shape 40X70 ft• Roof Height 20ft• Columns:– Six square shape columns
Sign Board• 22 ft height• 10X12 ft• 10 ft long columns
Louisiana Tech UniversityCollege of Engineering & Science
Transportation Design Water Resources Gas StationBridge Corridor
Reference Books
Louisiana Tech UniversityCollege of Engineering & Science
Transportation Design Water Resources Gas StationBridge Corridor
Additional Reference
Louisiana Tech UniversityCollege of Engineering & Science
Transportation Design Water Resources Gas StationBridge Corridor
Realistic constraints include economic, environmental, social, political, ethical, health and safety, manufacturability, and sustainability considerations.
• Environmental– Snow– Earthquake– Wind
Realistic Constrains
Louisiana Tech UniversityCollege of Engineering & Science
Transportation Design Water Resources Gas StationBridge Corridor
Design Procedure
Louisiana Tech UniversityCollege of Engineering & Science
Transportation Design Water Resources Gas StationBridge Corridor
Loads
Louisiana Tech UniversityCollege of Engineering & Science
Transportation Design Water Resources Gas StationBridge Corridor
Total load = 20 psf
Dead Load
Louisiana Tech UniversityCollege of Engineering & Science
Transportation Design Water Resources Gas StationBridge Corridor
L = Lo * R1* R2
Roof Live Load
20 psf
Louisiana Tech UniversityCollege of Engineering & Science
Transportation Design Water Resources Gas StationBridge Corridor
Wind Load
Louisiana Tech UniversityCollege of Engineering & Science
Transportation Design Water Resources Gas StationBridge Corridor
Calculate wind Load (MWFRS)
Velocity Pressure (qz) -Topo-graphic factor -Velocity pressure exposure coefficient -Wind directional factor
Gust Factor (G)=0.85
Exposure category BKzt =1Kd = 0.85V=120 mphKz = 0.57
Louisiana Tech UniversityCollege of Engineering & Science
Transportation Design Water Resources Gas StationBridge Corridor
Calculate wind load store
Louisiana Tech UniversityCollege of Engineering & Science
Transportation Design Water Resources Gas StationBridge Corridor
Calculate wind load for canopy
Louisiana Tech UniversityCollege of Engineering & Science
Transportation Design Water Resources Gas StationBridge Corridor
Calculate wind load for signboard
Louisiana Tech UniversityCollege of Engineering & Science
Transportation Design Water Resources Gas StationBridge Corridor
Summary of loads
Store
Canopy
Sign board
Lateral
Lateral
Lateral
Louisiana Tech UniversityCollege of Engineering & Science
Transportation Design Water Resources Gas StationBridge Corridor
Calculate loads on each member (Using Tributary Areas)
Calculate tributary area for each member Calculate loads on members Use service and strength load combinations to get envelopes
Service Load Combinations Ultimate Load Combinations
Louisiana Tech UniversityCollege of Engineering & Science
Transportation Design Water Resources Gas StationBridge Corridor
Structural Analysis (Risa)
Louisiana Tech UniversityCollege of Engineering & Science
Transportation Design Water Resources Gas StationBridge Corridor
Statically indeterminate structuresLateral wind load
• 5 frames
Analyze in Risa
Louisiana Tech UniversityCollege of Engineering & Science
Transportation Design Water Resources Gas StationBridge Corridor
Frame for the store in Risa
Louisiana Tech UniversityCollege of Engineering & Science
Transportation Design Water Resources Gas StationBridge Corridor
Frames for the canopy in Risa
Louisiana Tech UniversityCollege of Engineering & Science
Transportation Design Water Resources Gas StationBridge Corridor
Frame for the signboard in Risa
Louisiana Tech UniversityCollege of Engineering & Science
Transportation Design Water Resources Gas StationBridge Corridor
Analyze in Risa
Store
Louisiana Tech UniversityCollege of Engineering & Science
Transportation Design Water Resources Gas StationBridge Corridor
Analyze in Risa
Canopy
Louisiana Tech UniversityCollege of Engineering & Science
Transportation Design Water Resources Gas StationBridge Corridor
Member Design
Louisiana Tech UniversityCollege of Engineering & Science
Transportation Design Water Resources Gas StationBridge Corridor
Selecting members
Louisiana Tech UniversityCollege of Engineering & Science
Transportation Design Water Resources Gas StationBridge Corridor
Selecting girders
MomentShearDeflectionDrift
Louisiana Tech UniversityCollege of Engineering & Science
Transportation Design Water Resources Gas StationBridge Corridor
Selecting joists
Louisiana Tech UniversityCollege of Engineering & Science
Transportation Design Water Resources Gas StationBridge Corridor
Selecting columns
• Checks– Slenderness ratio– Buckling load and stress– Bending strength– Nominal compressive strength – Width-thickness ratio– axial compressive load
Reasons to select HSS columns: Equal moment capacity in both directions Greater strength to weight ratio Easy for connections
Louisiana Tech UniversityCollege of Engineering & Science
Transportation Design Water Resources Gas StationBridge Corridor
Summary of members
Louisiana Tech UniversityCollege of Engineering & Science
Transportation Design Water Resources Gas StationBridge Corridor
Footing Design
Louisiana Tech UniversityCollege of Engineering & Science
Transportation Design Water Resources Gas StationBridge Corridor
Base plate Anchor rods
Footing analysis
Louisiana Tech UniversityCollege of Engineering & Science
Transportation Design Water Resources Gas StationBridge Corridor
Base Plates
Reasons to use base plates:• Spreads the axial load • Avoids crushing the concrete pier
ASTM A36 base plate
Louisiana Tech UniversityCollege of Engineering & Science
Transportation Design Water Resources Gas StationBridge Corridor
Anchor rods• Resist shear and tension forces • ASTM A 563 heavy double nut • 9 inch embedment • Headed anchor roads
Louisiana Tech UniversityCollege of Engineering & Science
Transportation Design Water Resources Gas StationBridge Corridor
Connection Design
Louisiana Tech UniversityCollege of Engineering & Science
Transportation Design Water Resources Gas StationBridge Corridor
Connections
Bolted connections
Advantages:Less time Easy to inspectDoes not require special skills
Louisiana Tech UniversityCollege of Engineering & Science
Transportation Design Water Resources Gas StationBridge Corridor
Shear connections
Checks •Bearing strength in bolts•Shear strength
ASTM A 325 bolts¾ diameter bolt
Louisiana Tech UniversityCollege of Engineering & Science
Transportation Design Water Resources Gas StationBridge Corridor
Moment Connections
Moment Connections for the canopy Moment Connections for the Store
Louisiana Tech UniversityCollege of Engineering & Science
Transportation Design Water Resources Gas StationBridge Corridor
Welding
¼ fillet welded all around
Louisiana Tech UniversityCollege of Engineering & Science
Transportation Design Water Resources Gas StationBridge Corridor
Connections drawings
Louisiana Tech UniversityCollege of Engineering & Science
Transportation Design Water Resources Gas StationBridge Corridor
Summary
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