Arlington Gateway Hotel 801 North Glebe Road Arlington

Arlington Gateway Hotel 801 North Glebe Road Arlington, Virginia Michael Gray Penn State University AE Senior Thesis Presentation 2005

Arlington Gateway Hotel Arlington, Virginia Michael Gray Structural Option Introduction Background Current Structure Alternate Systems Structural Redesign Outline of Presentation Background Current Structural System Alternate Structural Systems Structural Redesign Cost and Scheduling Recommendation Final Recommendation

Arlington Gateway Hotel Arlington, Virginia Michael Gray Structural Option Introduction Background Current Structure Alternate Systems Structural Redesign Cost and Scheduling Recommendation Site – Arlington Gateway 22 Story Residential tower 13 Story Office Building 15 Story Arlington Gateway Hotel

Arlington Gateway Hotel Arlington, Virginia Michael Gray Structural Option Introduction Background Current Structure Alternate Systems Structural Redesign Cost and Scheduling Recommendation General Information - Westin Hotel & Resort - Located within 5 min. of Reagan National Airport - 250, 000 Square Feet - 335 Units - Estimated cost $40 million Amenities - Starbucks Cafe - Restaurant and Lounge - Ballroom and Meeting Facilities - Indoor Swimming Pool - Fitness Center and Spa

Arlington Gateway Hotel Arlington, Virginia Michael Gray Structural Option Introduction Background Current Structure Alternate Systems Structural Redesign Cost and Scheduling Recommendation Structural System - Reinforced Cast-In-Place Concrete - 8” Two-Way Flat Slab Construction (Typical) - 4000 psi Concrete In Slabs - Mix of 4000 to 6000 psi Concrete In Columns Lateral System - Moment Frames Design Codes - BOCA 96 - ASCE 7 -95

Arlington Gateway Hotel Arlington, Virginia Michael Gray Structural Option Introduction Background Current Structure Alternate Systems Structural Redesign Cost and Scheduling Recommendation Alternate Systems for Mid-Rise Residential Structures - Prestressed Precast Concrete - Metal Deck and Composite Steel Beams - Hybrid Systems – Steel and Precast Staggered Truss System The Girder-Slab System

Arlington Gateway Hotel Arlington, Virginia Michael Gray Structural Option Introduction Background Current Structure Alternate System Selection - How will it work with current floor plan? - Will it maintain the current 8’-9” story height? - Any site constraints? Alternate Systems Staggered Truss Girder-Slab Flat-Slab Structural Redesign Fire Resistance 3 4 5 Cost and Scheduling Light Weight 5 5 2 Speed of Construction 5 4 3 Adaptable to current layout 3 4 5 16 17 15 Recommendation

Arlington Gateway Hotel Arlington, Virginia Michael Gray Structural Option Introduction Background Structural Redesign – The Girder-Slab System - Open Web Dissymmetric Beam (D-Beam) Current Structure Alternate Systems Structural Redesign Cost and Scheduling Recommendation - Uses precast hollow-core slabs - Composite Construction

Arlington Gateway Hotel Arlington, Virginia Michael Gray Structural Option Introduction Background Current Structure Alternate Systems Structural Redesign Cost and Scheduling Recommendation Design Loads – Flooring System ASCE 7 -02 Minimum Design Live Loads - Private Rooms - 40 psf - Corridors – 100 psf Additional Live Load - Partitions – 15 psf Dead Load - 8” Hollow Core Plank – 56 psf - Concrete Leveling Topping and Grout – 4 psf

Arlington Gateway Hotel Arlington, Virginia Michael Gray Structural Option Introduction Background Current Structure Alternate Systems Structural Redesign Cost and Scheduling Recommendation Design of Floor Members - 4 Standard Sizes to select from with 8” slab DB 8 x 35; DB 8 x 37; DB 8 x 40; DB 8 x 42 - Spreadsheet Created With Member Properties Checked Precomposite Deflections and Stresses Checked Composite Loads Checked Compressive Stress of Concrete Checked Stresses in Bottom Flange Checked Shear Capacity of Web

Arlington Gateway Hotel Arlington, Virginia Michael Gray Structural Option Introduction Background Current Structure Alternate Systems Structural Redesign Cost and Scheduling Recommendation Conclusions - Limited clear span Max span of 16’ when used with 28’ plank Dead load deflection becomes an issue - Solutions D-Beams can be made with camber Use of tree columns

Arlington Gateway Hotel Arlington, Virginia Michael Gray Structural Option Introduction Background Current Structure Alternate Systems Structural Redesign Cost and Scheduling Recommendation How much will it cost? - Rising material and labor costs - 8” plank costs roughly $7. 50/s. f. - D-Beams cost around 65 cents to fabricate - Standard wide flanges cost 35 cents to roll Assemblies Cost Structural System Cost Per Square Foot Staggered Truss $25 CIP Flat-Slab $30 Girder-Slab $22 - Could save $2 million over CIP

Arlington Gateway Hotel Arlington, Virginia Michael Gray Structural Option Introduction Background Current Structure Alternate Systems Structural Redesign Cost and Scheduling Recommendation Scheduling - Can place 40 -60 plank per day - Steel and plank erected at same time - 15, 000 s. f. per week - Superstructure constructed in just 15 weeks - 25% reduction in construction schedule

Arlington Gateway Hotel Arlington, Virginia Michael Gray Structural Option Introduction Background Current Structure Alternate Systems Structural Redesign Cost and Scheduling Recommendation Scheduling - Examples -8 story Drexel Dormitory superstructure finished in 31 days -Housing project at Princeton University superstructure finished in 4 weeks 2 5 -story buildings with one crane Totaling 96, 000 s. f.

Arlington Gateway Hotel Arlington, Virginia Michael Gray Structural Option Introduction Background Current Structure Alternate Systems Structural Redesign Cost and Scheduling Recommendation – The use of Girder-Slab Technology - Reduces construction schedule over CIP - Reduces overall weight of structure by 40% - Reduced cost - Innovative use of steel

Arlington Gateway Hotel Arlington, Virginia Michael Gray Structural Option Introduction Background Current Structure Alternate Systems Structural Redesign Cost and Scheduling Recommendation Got Questions?