Project 2- Steel Gas Station

Louisiana Tech University
College of Engineering & Science
Transportation Design Water Resources Gas StationBridge Corridor
Gas Station Design
By: Dinesha Kuruppuarachchi, Suganya
Soundararajan, Fatima usmona
May 2015

• Located in Shreveport, LA, off I-49
• According to Shreveport Zoning:
– Highway Business District
• Design for three structures:
– Store
– Canopy
– Sign Board

Site visit investigation…

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

Roof Design - Flat Roof
The structural steel framing with a steel
decking and joist system.
– Weather conditions
– Ease of fabrication
– Less cost

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

Reference Books

Additional Reference

Realistic constraints include economic,
environmental, social, political, ethical, health
and safety, manufacturability, and
sustainability considerations.
• Environmental
– Snow
– Earthquake
– Wind
Realistic Constrains

Design Procedure

Loads

Total load = 20 psf
Dead Load

L = Lo * R1* R2
Roof Live Load
20 psf

Wind Load

Calculate wind Load (MWFRS)
Velocity Pressure (qz)
-Topo-graphic factor
-Velocity pressure exposure coefficient
-Wind directional factor
Gust Factor (G)=0.85
Exposure category B
Kzt =1
Kd = 0.85
V=120 mph
Kz = 0.57

Calculate wind load store

Calculate wind load for canopy

Calculate wind load for signboard

Summary of loads
Store
Canopy
Sign board
Lateral
Lateral
Lateral

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

Structural Analysis
(Risa)

Statically indeterminate structures
Lateral wind load
• 5 frames
Analyze in Risa

Frame for the store in Risa

Frames for the canopy in Risa

Frame for the signboard in Risa

Analyze in Risa
Store

Analyze in Risa
Canopy

Member Design

Selecting members

Selecting girders
Moment
Shear
Deflection
Drift

Selecting joists

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

Summary of members

Footing Design

Base plate
Anchor rods
Footing analysis

Base Plates
Reasons to use base plates:
• Spreads the axial load
• Avoids crushing the concrete pier
ASTM A36 base plate

Anchor rods
• Resist shear and tension forces
• ASTM A 563 heavy double nut
• 9 inch embedment
• Headed anchor roads

Connection Design

Connections
Bolted connections
Advantages:
Less time
Easy to inspect
Does not require special skills

Shear connections
Checks
•Bearing strength in bolts
•Shear strength
ASTM A 325 bolts
¾ diameter bolt

Moment Connections
Moment Connections for the canopy Moment Connections for the Store

Welding
¼ fillet welded all around

Connections drawings

Summary

Project 2- Steel Gas Station

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