Charles Miller Construction Option Spring 2009 - Dr. Riley WestEnd25.

WestEnd25 Final Presentation

Charles Miller 2009 AE Senior ThesisConstruction Option - Riley WestEnd25

Charles Miller Construction OptionSpring 2009 - Dr. Riley

WestEnd25WestEnd251OutlineWestEnd25 BackgroundConcrete PlacementPrecast FaadeLEEDConclusionsAcknowledgementsQuestionsOutlineProject BackgroundConcreteFaadeLEEDConclusionsAcknowledgementQuestionsCharles Miller Construction OptionSpring 2009 - Dr. Riley

WestEnd25WestEnd252Function:Residential ApartmentsSize:324,000 sq. ft. / 10 storiesProject Cost:$76 Million Construction Period:March 2007 January 2009Owner: Vornado -Charles E. Smith Contractor: James G. Davis ConstructionArchitect: Shalom Baranes Associates ArchitectsProject Background

WestEnd25OutlineProject BackgroundConcreteFaadeLEEDConclusionsAcknowledgementQuestionsCharles Miller Construction OptionSpring 2009 - Dr. Riley

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Curtain WallExterior Faade:

Brick FacadeMetal PanelsExisting:Two 6 story office buildingsPrecast Faade Concrete Structural SystemNew Construction:One 10 story apartment buildingCurtain wall and Brick FacadeConcrete Structural SystemProject BackgroundConnection: 7.5 Post-Tensioned

Structural Concrete Slabs:

Added Levels: 6 Post-TensionedExisting: 7.5 Conventionally Reinforced

OutlineProject BackgroundConcreteFaadeLEEDConclusionsAcknowledgementQuestionsCharles Miller Construction OptionSpring 2009 - Dr. Riley

WestEnd25WestEnd254Concrete PlacementPlacement Method:Crane and BucketSuggested Placement: Concrete PumpFaster InstallationScheduleCost

Structural System: Existing: 6 Stories Concrete

New Construction: 6 Connectors4 Stories Concrete


WestEnd25WestEnd255Concrete PlacementSchedule Comparison:Same Connector Slab DurationPump Saves 2 Days per Full Slab


WestEnd25WestEnd256Concrete PlacementPlacement Schedule Effects Timeline:

10/8/0812/11/081/9/098/1/089/1/0810/1/0811/1/088/1/089/1/0810/1/0811/1/0812/1/087/18/087/1/087/3/088/15/0812/1/0812/26/091/1/09

10/14/08

4 Days12/1/088 Days10 Days7/1/081/1/09Crane and Bucket:

Pump:


WestEnd25WestEnd257Conclusion:Connecting Slabs Limit Efficiency Pump Benefits on Full SlabsLimited Overall Savings

Familiar but slower method is acceptable

Concrete PlacementItem Quantity Cost BasisTotal CostCrane and Bucket Placement4,106 CYEquipment = $7,000/weekLabor = $13/ CY$193,375Pump Placement 4,106 CY$18.20/ CY$74,750Cost Difference $118,625Supplemental Crane:$650/day For 131 days($85,150)Net Savings:$33,475General Conditions Savings$5,925/dayFor 10 days$59,250Total Savings:$92,725Potential savings of $92,725.12% of Project Cost

Cost:


WestEnd25WestEnd258Faade AnalysisOriginal FaadePrecastSpecified FaadeBrick Cavity WallPoor Slab Edges Precast FaadeScheduleCostThermal PerformanceStructural Loads


WestEnd25WestEnd259Faade Analysis Productivity AnalysisCE 533 Construction Productivity Analysis and Performance Evaluation

Activity in ProgressReport QuantitiesReport WorkhoursCalculate ProductivityPerformance EvaluationAnalysis ExpectationsLate Winter Weather Delays

Precast Benefits:Faster Installation Less Delays due to Weather


WestEnd25WestEnd25Faade AnalysisProductivity Chart3 Peaks of Decreased ProductivityOne Weather RelatedTwo Delays from Other Trades Uncompleted WorkData Point Majority Below BaselineBetter than Expected Productivity

Analysis Shows Limited Benefits due to Weather Delays

= Weather Delay

= Other Trade DelayOutlineProject BackgroundConcreteFaadeLEEDConclusionsAcknowledgementQuestionsCharles Miller Construction OptionSpring 2009 - Dr. Riley

WestEnd25WestEnd25Faade Analysis Schedule Comparison:

Brick Sequencing:1st floor North1st floor East1st floor South2nd floor North 2nd floor EastEtcPrecast Sequencing:North FacadeEast FacadeSouth Facade


WestEnd25WestEnd2512Faade AnalysisItemQuantityCost BasisTotal CostBrick Faade23,030 sq. ft.Budget Estimate: Labor = $489,000 Material Estimate = $416,000Equipment = $131,250$1,036,250Precast Facade23,030 sq. ft.$35/sq.ft.$806,050Difference:$230,200Demolition Extra Work:$77,000Total Savings:$307,200Cost:

Conclusion:Cost Savings Must be Weighed Against Risk of Difficult Installation Feasibility Depends on Crew


WestEnd25WestEnd2513Faade AnalysisU-Value ComparisonCoefficient of Heat TransferLower Value Better

Precast Option is Thermally Feasible

LayerR Value ((hr*ft2*oF)/Btu )Exterior Air Film0.174 in. Face Brick0.801.5 Air Space0.932 Rigid Insulation10.005/8 Gypsum Board0.56Framing Cavity9.01/2 Gypsum Board0.45Interior Air Film0.68Total22.59U-Value0.044Traditional Brick Faade:LayerR - Value ((hr*ft2*oF)/Btu )Exterior Air Film0.176 Concrete0.602 Rigid Insulation10.005/8 Gypsum Board0.56Framing Cavity9.01/2" Gypsum Board0.45Interior Air Film0.68Total 21.46U-Value0.047Precast Faade:OutlineProject BackgroundConcreteFaadeLEEDConclusionsAcknowledgementQuestionsCharles Miller Construction OptionSpring 2009 - Dr. Riley

WestEnd25WestEnd25Faade AnalysisStructural Analysispca Column

Precast Structurally FeasibleLoadCalculationTotalPanel 150lbs/ft3(.5ft)(1ft)(10.6ft)=795lbs/ftwidth795lbs/ftwidth(12ftwidth)9,540 lbsConcrete(0.625ft)(150lb/ft3)=93.75lbs/ft293.57lb/ft2(200ft2)+(22.5ft3)(150lbs/ft3)22,089 lbsWind43psf(1ft)(10.6)=455.8lbs/ftwidth455.8lbs/ftwidth(12ftwidth)5,469.6 lbsFloor40psf + 20psf =60psf60psf(200 ft2)12,000 lbs


WestEnd25WestEnd25Faade AnalysisFaade ConclusionThermal Analysis and Structural Analysis Prove the Precast Faade is Feasible Cost Savings Must be Weighed Against Risk of Difficult Installation Feasibility Depends on Crew


WestEnd25WestEnd25LEEDCritical Industry Issue: 2008 PACE Roundtable Breakout Session: LEED EvolutionIncrease Owner InvolvementInterviews of Industry ProfessionalsSeries of Open Ended QuestionsInteresting Results


WestEnd25WestEnd25LEEDWhat do owners need to do differently?Few Felt that Owners Need to Increase Knowledge BaseOwners Need to Accept Costs and Improve Integration


WestEnd25WestEnd25LEEDWhat mistakes do owners typically make that cause problems for a project attempting a LEED Certification?Indecisiveness is a Major Problem Owners Need to Set Clear Goals and Maintain Sustainability Commitment Indecisiveness is a Larger Problem than Accepting CostsOutlineProject BackgroundConcreteFaadeLEEDConclusionsAcknowledgementQuestionsCharles Miller Construction OptionSpring 2009 - Dr. Riley

WestEnd25WestEnd25LEEDWhat do owners do that is successful and helps the overall project?Successful Owners Clearly State Sustainability Goals and Maintain Their Commitment to Sustainability OutlineProject BackgroundConcreteFaadeLEEDConclusionsAcknowledgementQuestionsCharles Miller Construction OptionSpring 2009 - Dr. Riley

WestEnd25WestEnd25LEEDHow important is the selection of a design professional that has experience and expertise with sustainable design?All Participant Indicated Importance of Sustainable Experience63% Indicated a Level of Extreme Importance OutlineProject BackgroundConcreteFaadeLEEDConclusionsAcknowledgementQuestionsCharles Miller Construction OptionSpring 2009 - Dr. Riley

WestEnd25WestEnd25LEEDWhat design decisions are typically passed over without early owner commitment to LEED?Owners Typically Own Land Before Deciding to BuildOutlineProject BackgroundConcreteFaadeLEEDConclusionsAcknowledgementQuestionsCharles Miller Construction OptionSpring 2009 - Dr. Riley

WestEnd25WestEnd25LEEDResearch FindingsChanges/Waiting Deterrent Clear Goals and CommitmentDesigner Critical


WestEnd25WestEnd25SummaryConcrete PlacementFamiliar but Slower Concrete Placement Method is AcceptableFaade Analysis Thermal Analysis and Structural Analysis Prove the Precast is FeasibleCost Savings Must be Weighted Against Risk of Difficult InstallationLEEDResearch FindingsChanges/Waiting Deterrent Clear Goals and CommitmentDesigner Critical


WestEnd25WestEnd25Acknowledgments Vornado/Charles E. SmithJames G. Davis ConstructionAE Faculty Survey ParticipantsFamily & Friends


WestEnd25WestEnd25Questions?


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Charles Miller Construction Option Spring 2009 - Dr. Riley WestEnd25.

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