Senior Thesis Analysis Topics � Alternate Formwork System Evaluation (Depth Analysis) � The Green Building Reference Guide (Depth Analysis) � Office Tower Structural Redesign (Breadth Analyses)
Introduction � Occupants � Headquarters of United States Navy League � Retail, Offices � LEED Rating Arlington’s first LEED rated office building (Silver Rating)
Introduction � Design � Skewed plan � 212,947 sq.ft. 7- story office tower � 164,561 sq.ft. 4 - story sub-grade parking garage � Structure � Office tower: structural steel � Parking garage: C.I.P. concrete � M.E.P. � VAV system � Copper bus duct power risers
Project Background � Project Team � Owner: U.S. Navy League � Architect: Page Southerland Page LLC � Owner’s Representatives: The Keech Company LLC, Lincoln Properties � General Contractor: James G. Davis Construction Corp. GMP Contract � Main Subcontractors: Lump Sum Contracts � Concrete: Southland Concrete � Structural Steel: Strait Steel � Electrical: J.E. Richards � Mechanical/Plumbing: W.E. Bowers
Project Background � Project Delivery Design – Bid - Build � Building Costs � Project Schedule � Start Date: 5/8/2003 � Scheduled Completion Date: 4/26/2005
Alternate Formwork System Evaluation Analysis Overview & Goals As-built System: � Aluminum framing & plywood sheathing � Labor and material intensive Alternate System: � Accommodate existing design � Reusable components Goals: � Decrease formwork budget & duration � Improve sustainability aspects
Alternate Formwork System Evaluation Available Formwork Systems � Peri ‘Skydeck’ � Mid-State Filigree Systems � ‘Tabla’ by Gillespie Practical Technologies, Inc. � ‘Titan HV’
Alternate Formwork System Evaluation Slab Design Factors
Alternate Formwork System Evaluation Slab Design Factors First Floor Slab Framing Plan
Alternate Formwork System Evaluation Formwork System Selection � Design Characteristics � Labor � Engineering � Local Codes � Material Costs � Reusability Viable Alternate System: ‘Titan HV’ � Accommodates design � Potential labor savings � FSC plywood compatible
Alternate Formwork System Evaluation Cost & Production Factors
Alternate Formwork System Evaluation Conclusion Standard Titan HV Selection Criteria System System Design Characteristics Engineering Material Costs Labor Local Codes Reusability Excellent Satisfactory Poor Standard aluminum system is best option for the parking garage
The Green Building Reference Guide Analysis Overview & Goals Issues: � LEED ratings & sustainable design � Additional planning and management required � Unnecessary costs and possible delays � Lack of dedicated construction resources Solution: � Easily accessible network of resources � Organize online resources through structured website Goals: � Develop website to aid construction professionals � Increase knowledge = better chances of project’s success
The Green Building Reference Guide Reference Guide Development � Form � Function � Content Form: � Readily accessible platform: website � Targeted organization & direct format � Free to use & kept current � Database of available online resources � Main Topics: Material Procurement Site Management Waste Management Indoor Environmental Quality Commissioning
The Green Building Reference Guide Reference Guide Development Function: Website demonstration:
The Green Building Reference Guide Reference Guide Development Content: � Filtered content � Benefits: reduces search time, increases productivity � User input for future development & expansion
The Green Building Reference Guide Conclusions � GBRG created to address needs of building professionals � Targeted, organized content in graphical format � Positive feedback indicates value and potential
Office Tower Structural Redesign Analysis Overview & Goals Issues: � Structure transitions from concrete garage to steel tower � Inherent difficulties of steel: cost, time � M.E.P. coordination � Environmental impact of steel production Solution: Images of structural steel erection � Design C.I.P. concrete office tower � Establish costs & duration of alternate system Goals: � Reductions in budget and schedule with concrete tower � System with least environmental impact
Office Tower Structural Redesign Concrete Structure Design Development Criteria: � Maintain current structural layout and clearances � Maintain open plan office spaces Characteristics of Current Structural Steel System Dimensions 13’- 4” Floor to Floor Height 24” Maximum Member Depth 6” Composite Slab Thickness 43’ Maximum Bay Span Design Consideration: � Given span length, post-tensioning required � Develop schematic design
Office Tower Structural Redesign Concrete Structure Analysis Post-Tensioning Design Characterisitics Slab Type Two-way, Flat Slab Slab Dimensions Thickness (in) Tributary Width (ft) Span Length (ft) 12 30 29.5 to 43 Drop Panel Dimensions Width (in) Length (in) Depth (in) 36 36 8 Concrete Strength (psi) Unit Weight (psf) Columns Beams Slab 5000 5000 5000 150 (Normal weight) Steel Reinforcement Bar Yield Strength (fy) Modulus of Elasticity Clear Bar Cover 60 ksi 29,000 ksi 1" Post-Tensioning Cables System Type Area of Tendons Ultimate Tendon Strength Unbonded 0.153 in^2 (7/16" Diam.) 270 ksi Loading Design Load Type Typ. Floor Roof Uniform 80 psf 100 psf Columns Size Floor to Floor Height 14" x 14" 13' - 6"
Office Tower Structural Redesign Concrete Structure Analysis 36” x 36” x 8” Deep Drop Panel, Typical 12” Thick Post-Tensioned Slab Rendering of C.I.P. Concrete Slab, Columns, & Drop Panels
Office Tower Structural Redesign Budget & Schedule Comparison Cost difference of $863,000 Concrete is 33% more expensive than steel
Office Tower Structural Redesign Budget & Schedule Comparison
Office Tower Structural Redesign Additional Topics � Applications of Alternate Formwork System ‘Titan HV’ � Environmental Impact: Concrete vs. Steel Benefits of steel = benefits of concrete � Structural & M.E.P. Coordination
Office Tower Structural Redesign Structural & M.E.P. Coordination Coordination Plan: H.V.A.C. Plan with C.I.P. System Overlay
Office Tower Structural Redesign Conclusions Post-Tensioned Analysis Criteria Steel System Concrete System Total Cost Total Duration M.E.P. Coordination Environmental Impact Most appropriate Equal advantages Least appropriate Structural steel provides greater value most appropriate
Conclusions Alternate Formwork System Evaluation � Most viable: Titan HV system � Titan HV: greater cost & duration � Selected standard aluminum system The Green Building Reference Guide � Logically organized, up-to-date list of resources � Positive feedback indicates potential Office Tower Structural Redesign � Post-tensioned, C.I.P. concrete structural system � Greater overall cost and duration � Equal environmental impact � Existing steel system offers best value
Acknowledgements I would like to thank the following people for their help and support in the development of this Senior Thesis Project: � Southland Concrete � Penn State University Mark Aulabaugh Dr. Michael Horman (Thesis Advisor) � Titan Formwork Systems, LLC Dr. David Riley Dr. Kevin Parfitt Paul Tauscher � James G. Davis Construction Corp � Arlington County, Virginia Bill Moyer Michael Lewis Dave Purdy � Personal Contacts Hasan Alsayegh My fiancé, Diane Kim Pexton My family � The Keech Company My friends Bill Keech Sr. Bill Keech Jr.
Questions ? ? Questions
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