VIRGINIA ADVANCED SHIPBUILDING & CARRIER INTEGRATION CENTER NEWPORT NEWS, VA John Boyle Structural Option Thesis Advisor – Dr. Behr Source: Clark-Nexsen Source: Clark-Nexsen
ACKNOWLEDGEMENTS I would like to thank the following individuals for their support on this project Professor M. Kevin Parfitt Kurt J. Clemente Professor Robert Holland Dr. Behr I would also like to thank my parents, John and Diana for their relentless support throughout this semester
Building Statistics Project Team • Introduction • Building Statistics • Building Occupancy Name: Northrop Grunman Newport News Clark-Nexsen Architecture & Engineering • Architecture • Occupancy Type: Office / Research / Shipbuilding Facility • Existing Structural System • Size: 241,000 sf • Problem Statement • Number of Stories: 8 • Proposed Solution • Date of Construction: December 1999-February 2002 • Architectural Breadth: • Actual cost: $58 million Column Layout Redesign • Project Delivery: Design-Bid-Build • Slab Redesign • Loads • Column Redesign • Lateral System Redesign • CM Breadth: Cost Analysis • Flood Analysis Source: Clark-Nexsen
Architecture • Introduction • Building Statistics • Achieves light, open feel • Architecture • Uses steel wide-flange members • Existing Structural System • Enclosed in reflective curtain wall • Problem Statement • Curve shape • Proposed Solution • Gives appearance of a tall, glass ship looking over the • Architectural Breadth: James River Column Layout Redesign • Concrete “figurehead” • Slab Redesign • Loads • Column Redesign • Lateral System Redesign • CM Breadth: Cost Analysis • Flood Analysis Source: Clark-Nexsen
Existing Structural System • Introduction • Existing Structural System FOUNDATION CONC. PEDESTAL PLAN • Foundation • Gravity • Wide-flange steel column on a concrete pedestal • Lateral • Placed around perimeter of the building • Problem Statement • Soil Condition: Unstable soil • Proposed Solution • Grade beams: 20” & 22” • Architectural Breadth: CONC. PEDESTAL SECTION • Resist lateral column base movement Column Layout Redesign • Distribute weight of the building over soil • Slab Redesign • Loads • Column Redesign • Lateral System Redesign • Source: Clark-Nexsen CM Breadth: Cost Analysis • Flood Analysis Source: Clark-Nexsen Source: Clark-Nexsen
Existing Structural system • Introduction • Existing Structural System GRAVITY Floors 2-7 • Foundation Structural Floorplan • Gravity • FLOOR • Source: Clark-Nexsen Lateral • 4.5” total thickness composite steel deck and slab • Problem Statement • Lightweight concrete placed 2” deep, .038” thick • Proposed Solution galvanized steel deck • Architectural Breadth: • Yield Strength: 33 ksi Column Layout Redesign • BEAMS / COLUMNS • Slab Redesign • Steel wide-wide flange members • First Floor Loads • W12x14 – W18x40 used for beams • Column Redesign Structural Floorplan • W8, W10, W12, W14 used for columns • Lateral System Redesign Source: Clark-Nexsen • CM Breadth: Cost Analysis • 1 st Floor • Flood Analysis • 5” slab on grade w/ 6x6 W2.9xW2.9 WWF (blue) • 8” slab on grade - #4 bars @ 12” o.c. (red) • 6” slab on grade w/ 6x6 W2.9xW2.9 WWF (green)
Existing Structural System • Introduction K-Braced Frame K-Braced Frame • Existing Structural System LATERAL • Section Location Foundation • Gravity • K-Braced Frame • Lateral • Wide-flange members used for vertical members • Problem Statement • W14x82 – W14x90 – W14x159 • Proposed Solution • HSS members used for cross-bracing • Architectural Breadth: • X-Bracing used in 3 bays Column Layout Redesign • Penthouse resists largest wind force • Slab Redesign • Bays on bottom level have added weight of floors above • Loads • X-bracing allows one member to be in tension and one to be • Column Redesign in compression • Lateral System Redesign • Caters well to the shape of the building • CM Breadth: Cost Analysis • Allows lateral loads to be distributed throughout the unique • Flood Analysis shape of the building Source: Clark-Nexsen Source: Clark-Nexsen
Problem Statement • Introduction • Existing Structural System • Curved shape leads to confusing column layouts • Problem Statement • Current column layout leads to confusing beam and joist layouts • Proposed Solution • Creates great differences in floor depth • Architectural Breadth: Column Layout Redesign • Slab Redesign • Loads • Column Redesign • Lateral System Redesign • CM Breadth: Cost Analysis • Flood Analysis
Problem Solution • Introduction • Existing Structural System • Investigate new column layouts • Problem Statement • Redesign structural system using reinforced concrete • Proposed Solution • Composite Steel Deck / Wide flange steel beams • Architectural Breadth: • => Two-way flat slabs Column Layout Redesign • Wide flange steel columns • Slab Redesign • => Reinforced concrete columns • Loads • K-Braced lateral resisting frame • Column Redesign • => Shear walls • Lateral System Redesign • Reduces floor thickness which will allow building to keep a light, • CM Breadth: Cost Analysis open feel and may reduce cost • Flood Analysis
Architectural Breadth: • Introduction • Column Layout Redesign Existing Structural System Current Column • Problem Statement Layout • Proposed Solution • Original column layout: Source: Clark-Nexsen • Architectural Breadth: • Contains irregularly shaped bays Column Layout Redesign • Crafted to shape of building • Slab Redesign • Loads • Redesign • Column Redesign • Created grid using existing perimeter columns • Lateral System Redesign • Created moderately sized, rectangular bays • Redesigned CM Breadth: Cost Analysis • Will make designing column strips and drop panels easier • Flood Analysis • Smallest Bay: 24’ - 11” x 2’ - 3” Column Layout • Largest Bay: 29’ - 11” x 33’ - 10” Source: Clark-Nexsen • Columns are placed with little-to-no interference with the current floor plan
Architectural Breadth: • Introduction • Column Layout Redesign Existing Structural System Current Column • Problem Statement Layout • Proposed Solution • Original column layout: • Architectural Breadth: • Contains irregularly shaped bays Column Layout Redesign • Crafted to shape of building • Slab Redesign • Loads • Redesign • Column Redesign • Created grid using existing perimeter columns • Lateral System Redesign • Created moderately sized, rectangular bays • Redesigned CM Breadth: Cost Analysis • Will make designing column strips and drop panels easier • Flood Analysis • Smallest Bay: 24’ - 11” x 2’ - 3” Column Layout • Largest Bay: 29’ - 11” x 33’ - 10” • Columns are placed with little-to-no interference with the current floor plan
Slab Redesign • Introduction • Existing Structural System • Original floor system SLAB THICKNESS FLOORS 1-7 • Problem Statement • Composite steel deck • Proposed Solution • Wide-flange steel beams • Architectural Breadth: • Floor thickness: 22.5” Column Layout Redesign • Slab Redesign • Redesign • Results • Two-way flat slab: 4,000 psi concrete • Architectural Impact • Advantages • SLAB THICKNESS PENTHOUSE Loads • Easy formwork • Column Redesign • Simple bar placements • Lateral System Redesign • Minimize floor-to-floor heights • CM Breadth: Cost Analysis • Results • Flood Analysis • 12” thickness w/ 3” drop panels • Penthouse: • 10” thickness w/ 3” drop panels • Nearly 8”/floor reduction
Slab Redesign • Introduction • Existing Structural System • Architectural Impact • Problem Statement • 8” reduction in floor thickness • Proposed Solution • Reduces total floor height by nearly 5 feet • Architectural Breadth: Column Layout Redesign • Slab Redesign • Results FLOOR HEIGHT (CURRENT BUILDING) HEIGHT (REDESIGN) • Architectural Impact 1 st 0’ - 0” 0’ - 0” 2 nd 17’ - 6” 17’ - 6” • Loads 3 rd 32’ - 10” 32’ - 2” • Column Redesign 47’ - 2” 45’ - 10” 4 th 61’ - 6” 59’ - 6” 5 th • Lateral System Redesign 6 th 75’ - 10” 73’ - 2” • CM Breadth: Cost Analysis 7 th 90’ - 2” 86’ - 10” 104’ - 6” 99’ - 8” Penthouse • Flood Analysis 126’ - 3” 122’ - 1” Roof
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