seth r. takoch structural option computer associates international, regional office herndon, va seth...
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SETH R. TAKOCH STRUCTURAL OPTION
Computer Associates International, Regional
Office Herndon, VA
Seth R. Takoch
AE Senior Thesis
Structural Option
April 15, 2003
SETH R. TAKOCH STRUCTURAL OPTION
Presentation Outline
Background InformationExisting Structural ConditionsDesign CriteriaRedesignConstruction ManagementLighting DesignConclusions and RecommendationAcknowledgements
SETH R. TAKOCH STRUCTURAL OPTION
SETH R. TAKOCH STRUCTURAL OPTION
Location
15min. Off Beltway 35mins. Outside D.C
Wood Oak Dr.
Baseball Field
SETH R. TAKOCH STRUCTURAL OPTION
Background Information
Function: Computer Associates Int. Regional Headquarters
Size: 233,000 sq. ft. – 6 floors
Rentable Office Space: 207,000 sq. ft.
Architectural Features:
•Precast Concrete Façade with Glass Curtain Wall
•Six Story Glass Enclosed Atrium
•Adjacent Day Care Facility
SETH R. TAKOCH STRUCTURAL OPTION
Project Team
Owner – Computer Associates International Arcitect – Davis, Carter, Scott Structural Engineer – Smislova, Kehnemui, & Associates. General Contractor – Clark Construction Developer – Tishman Speyer Properties Mechanical – GHT Limited Plumbing – GHT Limited
SETH R. TAKOCH STRUCTURAL OPTION
Existing Structure
Flat Slab ConstructionConcrete Structure
• 30’ x 30’ Bays• 9” Thick Slab Thickness• 10’ x 10’ x 5-1/2” Drop
Panels• 24” x 24” Conc. Columns
SETH R. TAKOCH STRUCTURAL OPTION
Existing Structure
Wind Loads are Transferred by Diaphragm Action of Façade
Transferred to Framing by Tributary Area• 8 Frames N-S and 9 Frames E-W
Concrete Frames Resist Lateral Forces • Short and Long Frames
Floor Slab Adds Resistance due to Diaphragm Action
SETH R. TAKOCH STRUCTURAL OPTION
Design Limitations
Old Code – BOCA 96 New Code – IBC 2000 Local Zoning Ordinances Similar Square Footage Minimal Architectural
Changes Floor-to-Floor Heights
LIVE LOADS PER IBC 2000
LOAD TYPE LOAD
ROOF ( RAIN ) 50 psf
ROOF ( SNOW ) HIGH ROOF 22 psf
ROOF (SNOW) LOW ROOF 30 psf
OFFICES, CUBICLES 50 psf
ASSEMBLY, STAIRS 100 psf
MECHANICAL 150 psf
CORRIDORS 80 psf
SETH R. TAKOCH STRUCTURAL OPTION
Proposal
To Redesign a Feasible and Desirable Alternative Structural System and to Incorporate Construction Costs and Schedule Length Into My Solution
Time = Money …
Money = Time
$$$$
SETH R. TAKOCH STRUCTURAL OPTION
Possible Faming Alternatives
Composite Steel Construction
Non-Composite Steel Construction
SETH R. TAKOCH STRUCTURAL OPTION
Steel Construction
Code – IBC2000LRFD Analysis
• Parameters• 30’ x30’ Typical Bays• Fy = 50ksi ASTM A992 Steel• F’c = 3ksi• Normal Weight Concrete• Shear Studs - 3-1/2”high, ¾” diameter
(composite)• 22 gage Metal Deck
SETH R. TAKOCH STRUCTURAL OPTION
Composite Steel Construction
Gravity Analysis – RAM • Determined Beam Sizes• Determined Column Sizes
2 Story Column Lengths 26’ – 28’ Tall• Ranging from W10’s to W12’s
Beam Sizes W12x14 Spaced at 6’ o.c.• Girders as Deep as a W21’s
SETH R. TAKOCH STRUCTURAL OPTION
Non-Composite Construction
Gravity Analysis – RAM • Determined Beam Sizes• Determined Column Sizes
2 Story Column Lengths 26’ – 28’ Tall• Using W12’s
Beam Sizes W12x14 Spaced at 6’ o.c.• Girders as Deep as a W24’s
SETH R. TAKOCH STRUCTURAL OPTION
Depth Comparison
Composite Steel
•Average – W12’s
•Critical Depth – W21
Non-Composite Steel
•Average – W12’s
•Critical Depth – W24
Advantage – Composite Steel Construction
Composite Saves 20 Tons
of Steel
SETH R. TAKOCH STRUCTURAL OPTION
Lateral System
Shear Wall to Resist Lateral LoadingBased on Critical Wind Loading and
Torsion2 – 60’ Long Shear Walls
• Reinforced to Resist Forces• Deflection of h/400
A trium
S hear Wall #2
Shear W
all #1
C enter of Rigidity
A trium
SETH R. TAKOCH STRUCTURAL OPTION
Design
Reinforcement Based on the Following Vn = (2f’c bd +
Avfyvd/s) Mn = Asfy (d-a/2)
Wall Floor ShearBendin
g
1#4 @ 12"
8 - #11
2#4 @ 12"
6 - #11
1 3#4 @ 12"
6 - #9
4#6 @ 12"
4 - #9
5#7 @ 12"
2 - #9
6#9 @ 12"
1 - #9
1#4 @ 12"
8 - #11
2#4 @ 12"
6 - #11
2 3#5 @ 12"
6 - #9
4#6 @ 12"
4 - #9
5#8 @ 12"
2 - #9
6#10 @
12"1 - #9
SETH R. TAKOCH STRUCTURAL OPTION
Construction Management`
Address Two Main Issues
•Cost Comparison
•Project Duration
SETH R. TAKOCH STRUCTURAL OPTION
Construction Management
Total Building Cost• D4 Cost
• Total = $27,678,667• 20-25% Accurate• Range of $34.6 million to $20.8 million • Not Very Accurate• $115.33 / sq. ft.
`
SETH R. TAKOCH STRUCTURAL OPTION
Construction Management
Total Building Cost• Means Building Construction Cost Data
• Separate Estimates for Steel and Concrete• 10 -15% Accurate• More Precise Than D4• Steel Framing = $96.74 / sq.ft.• Concrete Frame = $98.45 / sq.ft. • Difference = $1.71 / sq.ft. = $410,400
`
SETH R. TAKOCH STRUCTURAL OPTION
Construction Management
Cost Comparison• D4 Cost = $115.33/sq.ft. = $27,678,667• Means Steel = $96.74/sq.ft. = $23,217,600• Means Concrete = $98.45/sq.ft. =
$23,628,000• Percentage Savings Using Steel = 1.7%
Savings
`
SETH R. TAKOCH STRUCTURAL OPTION
Construction Management
Scheduling• Means Data to Calculate Duration • Primavera Utilized to Schedule Sequences• Total Duration Steel Erection = 376days• Total Duration Concrete Placement = 847
days
`
SETH R. TAKOCH STRUCTURAL OPTION
Construction Management`
After Scheduling Concrete – 260 Days
SETH R. TAKOCH STRUCTURAL OPTION
Construction ManagementAfter Scheduling – 150 Days
`
SETH R. TAKOCH STRUCTURAL OPTION
Construction Management
Savings• Advantage Composite Steel Construction
Time
• Advantage Composite Steel Construction
`
Composite Design is Considered One of the Most Economical Methods of Floor Construction for an Office Building
SETH R. TAKOCH STRUCTURAL OPTION
Construction Management
Crane Sizing• On Site 3-1/2 Months• Tower Crane
• Placed Through Atrium• Liebherr 200HC• Hook Radius – 197ft.• Capacity – 5,070#• Satisfies Critical Lift of 3,000# @160ft.
`
SETH R. TAKOCH STRUCTURAL OPTION
Lighting Design
Design of Lighting of Daycare Facility• Minimum Footcandles of 30fc• Fluorescent Luminaries• 120’ x 56’ Space to Illuminate• 2’ x 4’ Fixtures with 3” Louvers Spaced
on a 16’ x 8’ grid• Specification From Lithonia• Workplane of 2-1/2 ft.
SETH R. TAKOCH STRUCTURAL OPTION
Lighting Design
Designed Using LuxiconRenderings on April 15, 2003
• At 9:00 am with Daylighting• At 1:30 pm with Daylighting• At 5:00 pm with Daylighting• Without Daylighting
SETH R. TAKOCH STRUCTURAL OPTION
Lighting Design
9:00 am
SETH R. TAKOCH STRUCTURAL OPTION
At 1:30 pm
Lighting Design
SETH R. TAKOCH STRUCTURAL OPTION
At 5:00 pm
Lighting Design
SETH R. TAKOCH STRUCTURAL OPTION
• Without Daylighting
Lighting Design
SETH R. TAKOCH STRUCTURAL OPTION
Lighting Design
The Lighting Design Meets Required Parameters of 30fc
SETH R. TAKOCH STRUCTURAL OPTION
Conclusion
In Conclusion, Composite Steel Construction is a Better Alternative to Non-Composite Construction.
Composite Steel is a Viable Alternative to a Two-Way Flat Slab System
SETH R. TAKOCH STRUCTURAL OPTION
Shout Outs’My Family
My Friends
The AE Student Body
The Entire AE Faculity
Smislova, Kehnemui, & Associates, P.A.
Computer Associates
The ‘U’
And All Of Those Out There That Stuck With Me
SETH R. TAKOCH STRUCTURAL OPTION
Questions
?
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