Project 2- Steel Gas Station

Louisiana Tech UniversityCollege of Engineering & Science

Transportation Design Water Resources Gas StationBridge Corridor

Gas Station DesignBy: 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 RoofThe 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

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 BKzt =1Kd = 0.85V=120 mphKz = 0.57

Calculate wind load store

Calculate wind load for canopy

Calculate wind load for signboard

Summary of loads

Canopy

Sign board

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 structuresLateral 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

Canopy

Member Design

Selecting members

Selecting girders

MomentShearDeflectionDrift

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 inspectDoes not require special skills

Shear connections

Checks •Bearing strength in bolts•Shear strength

ASTM A 325 bolts¾ 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

Documents

Transcript of Project 2- Steel Gas Station

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