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Concrete Beam Economics. Bob Lawrence Alan Schuetz James Giancaspro Mark McDonnell. Agenda. Problem Statement Concrete Assumptions Example of Spreadsheet Program Economics of a Concrete Beam Alternative Solutions Concrete Steel Economic Assumptions for Concrete and Steel

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concrete beam economics

Concrete Beam Economics

Bob Lawrence

Alan Schuetz

James Giancaspro

Mark McDonnell

agenda
Agenda
  • Problem Statement
  • Concrete Assumptions
  • Example of Spreadsheet Program
  • Economics of a Concrete Beam
  • Alternative Solutions
  • Concrete
  • Steel
  • Economic Assumptions for Concrete and Steel
  • Costs for Concrete and Steel Beams
  • Conclusion
problem statement
Problem Statement
  • To develop a cost analysis of a concrete beam using multiple parameters and compare the final cost with alternative methods
economic assumptions concrete
Concrete Beam length shall be from 0’ to 50’

Water, Sand, Aggregate and Steel will have constant unit prices.

The price of water came from the Seattle Public Works.

The prices for Sand, Steel and Aggregate were taken from Engineering News Report.

The unit prices for Sand, Aggregate and Steel are calculated through a 20 city average.

Economic Assumptions Concrete
concrete economic assumptions cont
Only three types of concrete beams will be studied: Box, T, and L

Concrete Beams have a life span of 50 years

Labor cost will be the same for all 3 types

Concrete beams require negligible maintenance

At the end of 50 years the beam has no salvage value and is recycled

Concrete Economic Assumptions Cont.
spreadsheet economics
Spreadsheet Economics
  • 10’ Beam
  • Total Material Cost For A Box Beam $108.46
  • Total Material Cost For A T-Beam $54.07
  • Total Material Cost For A L-Beam $59.55
  • 20’ Beam
  • Total Material Cost For A Box Beam $496.02
  • Total Material Cost For A T-Beam $243.12
  • Total Material Cost For A L-Beam $271.65
spreadsheet econ cont
Spreadsheet Econ. Cont.
  • 40’ Beam
  • Total Material Cost For A Box Beam $2,515.91
  • Total Material Cost For A T-Beam $1,194.46
  • Total Material Cost For A L-Beam $1,388.35
  • 50’ Beam
  • Total Material Cost For A Box Beam $4,248.96
  • Total Material Cost For A T-Beam $2,049.36
  • Total Material Cost For A L-Beam $2,325.37
alternatives
Alternatives
  • Steel Beams
  • Wood
  • Plastic Lumber
alternative cont
Alternative Cont.
  • We only considered Steel because Plastic Lumber is still in the developmental stage and the amount of Wood needed to hold an equal load is impractical
concrete
Benefits

Cheap Materials

Can hold same load as Steel

Durable

Low Maintenance

No Finishing Required

Negatives

Shorter life span

Doesn’t allow for taller structures

Concrete cannot take tensile force

Concrete
steel
Benefits

Long Life span

Has Salvage value

Allows for taller structures

Works equally as well in tension and compression

Negatives

High Maintenance

More expensive than concrete

Steel
assumptions for concrete steel comparison
Safety and Strength for steel and concrete beams will be set equal so there will be an even comparison

Installation cost for steel and concrete beams are the same

When disassembled neither will have an effect on the environment so that will not be considered.

Assume 3 Masons can construct a concrete beam in 1 hour (pre-molded)

Assumptions for Concrete/Steel Comparison
assumptions cont
Steel beam must be painted every 7 years or they will rust

We will terminate our economic comparison at 49 years so the study times will be equal

MARR 10%

The spreadsheet program assumes all steel is 60 ksi.

The price of steel is a national average.

The current recycling value of steel is $90.00/ton

Assumptions Cont.
steel beams
Steel Beams
  • There are only two steel beam that can hold the 10,000 lb. live and dead load we have specified for the concrete beams
  • They are the:

W36 - 848

W36 - 798

materials cost comparison
Concrete Beam

50’ in length

Total Material Cost For a Box Beam $4,248.96

Total Material Cost For a T-Beam $2,049.36

Total Material Cost For a L-Beam $2,325.37

Steel Beam

50’ in length

W36- 798

$25,935

W36- 848

$27,560

Materials Cost Comparison
maintenance concrete
Maintenance Concrete
  • Concrete Beam
  • Maintenance cost is very near zero
maintenance steel
Maintenance Steel
  • Steel must be painted every 7 years
  • Assume 2 painters can cover 3,600 sq. ft per day
  • They are paid $.11 per sq. ft.
  • Paint cost $.05 per sq. ft.
  • One beam’s cost are:

Labor: $396

Paint: $90

labor cost concrete
Labor Cost Concrete
  • Labor Cost for Concrete and Steel are the same except for the beam must be formed out.
  • Assume 3 masons per beam
  • Assume Mason Labor Rate: $27.52/hour
  • Cost per beam:

$82.56

salvage value
Concrete

Concrete has salvage value of approximately zero

Steel

50’ Length

W36- 848

Salvage Value: $1908

W36 - 798

Salvage Value: $1795.5

Salvage Value
cost comparison per 50 beam
Concrete Annual Worth

Labor $8.33

Materials

Box $428.72

T $206.78

L $234.63

Salvage $0

Maintenance $0

Steel Annual Worth

Materials

W36- 848 $2616.84

W36- 798 $2780.80

Maintenance

Both beams $238.73

Salvage

W36- 848 $1.72

W36-798 $1.62

Cost ComparisonPer 50’ Beam
total costs
Total Costs
  • Total Costs
  • Concrete
    • Box -$437
    • T -$215.16
    • L -$243
  • Steel
    • W36- 848 -$3017.81
    • W36- 798 -$2853.95
conclusion
Conclusion
  • The main purpose of our project was to set up a Spreadsheet that calculates material prices for concrete beams
  • Although through comparison our recommendation would be for Concrete Beams