Arlington Gateway Hotel Arlington Gateway Hotel Arlington, Virginia 801 North Glebe Road Michael Gray Arlington, Virginia Structural Option Introduction Outline of Presentation Background Background Current Structure Current Structural System Alternate Systems Alternate Structural Systems Structural Redesign Structural Redesign Cost and Cost and Scheduling Scheduling Final Recommendation Recommendation Michael Gray Penn State University AE Senior Thesis Presentation 2005 Arlington Gateway Hotel Arlington Gateway Hotel Arlington, Virginia Arlington, Virginia Michael Gray Michael Gray Structural Option Structural Option Site – Arlington Gateway General Information Introduction Introduction 22 Story Residential tower - Westin Hotel & Resort Background 13 Story Office Building Background - Located within 5 min. of Reagan National Airport 15 Story Arlington Gateway Hotel Current Structure Current Structure - 250,000 Square Feet - 335 Units Alternate Alternate Systems Systems - Estimated cost $40 million Structural Structural Amenities Redesign Redesign - Starbucks Cafe Cost and Cost and - Restaurant and Lounge Scheduling Scheduling - Ballroom and Meeting Facilities Recommendation Recommendation - Indoor Swimming Pool - Fitness Center and Spa Arlington Gateway Hotel Arlington Gateway Hotel Arlington, Virginia Arlington, Virginia Michael Gray Michael Gray Structural Option Structural Option Structural System Alternate Systems for Mid-Rise Residential Structures Introduction Introduction - Reinforced Cast-In-Place Concrete - Prestressed Precast Concrete Background Background - 8” Two-Way Flat Slab Construction (Typical) - Metal Deck and Composite Steel Beams Current Structure - 4000 psi Concrete In Slabs Current Structure - Hybrid Systems – Steel and Precast - Mix of 4000 to 6000 psi Concrete In Columns Alternate Alternate Systems Systems Staggered Truss System The Girder-Slab System Lateral System Structural Structural - Moment Frames Redesign Redesign Cost and Cost and Design Codes Scheduling Scheduling - BOCA 96 Recommendation Recommendation - ASCE 7-95 1
Arlington Gateway Hotel Arlington Gateway Hotel Arlington, Virginia Arlington, Virginia Michael Gray Michael Gray Structural Option Structural Option Alternate System Selection Structural Redesign – The Girder-Slab System Introduction Introduction - How will it work with current floor plan? - Open Web Dissymmetric Beam (D-Beam) Background Background - Will it maintain the current 8’-9” story height? Current Structure Current Structure - Any site constraints? Alternate Alternate Systems Systems Staggered Truss Girder-Slab Flat-Slab Structural Structural Fire Resistance 3 4 5 Redesign Redesign Light Weight 5 5 2 - Uses precast hollow-core slabs Cost and Cost and Speed of Construction 5 4 3 Scheduling Scheduling - Composite Construction Adaptable to current layout 3 4 5 Recommendation Recommendation 16 17 15 Arlington Gateway Hotel Arlington Gateway Hotel Arlington, Virginia Arlington, Virginia Michael Gray Michael Gray Structural Option Structural Option Design Loads – Flooring System Design of Floor Members Introduction Introduction ASCE 7-02 Minimum Design Live Loads - 4 Standard Sizes to select from with 8” slab Background Background - Private Rooms - 40 psf DB 8x35; DB 8x37; DB 8x40; DB 8x42 Current Structure Current Structure - Corridors – 100 psf - Spreadsheet Created With Member Properties Checked Precomposite Deflections and Stresses Alternate Alternate Systems Systems Additional Live Load Checked Composite Loads - Partitions – 15 psf Checked Compressive Stress of Concrete Structural Structural Redesign Redesign Checked Stresses in Bottom Flange Dead Load Checked Shear Capacity of Web Cost and Cost and Scheduling - 8” Hollow Core Plank – 56 psf Scheduling - Concrete Leveling Topping and Grout – 4 psf Recommendation Recommendation Arlington Gateway Hotel Arlington Gateway Hotel Arlington, Virginia Arlington, Virginia Michael Gray Michael Gray Structural Option Structural Option Conclusions How much will it cost? Introduction Introduction - Limited clear span - Rising material and labor costs Background Background Max span of 16’ when used with 28’ plank - 8” plank costs roughly $7.50/s.f. Current Structure Dead load deflection becomes an issue Current Structure - D-Beams cost around 65 cents to fabricate - Solutions - Standard wide flanges cost 35 cents to roll Alternate Alternate Systems D-Beams can be made with camber Systems Assemblies Cost Use of tree columns Structural Structural Structural System Cost Per Square Foot Redesign Redesign Staggered Truss $25 Cost and Cost and Scheduling Scheduling CIP Flat-Slab $30 Recommendation Recommendation Girder-Slab $22 - Could save $2 million over CIP 2
Arlington Gateway Hotel Arlington Gateway Hotel Arlington, Virginia Arlington, Virginia Michael Gray Michael Gray Structural Option Structural Option Scheduling Scheduling - Examples Introduction Introduction - Can place 40-60 plank per day -8 story Drexel Dormitory superstructure Background Background finished in 31 days - Steel and plank erected at same time Current Structure Current Structure - 15,000 s.f. per week -Housing project at Princeton University superstructure finished in 4 weeks - Superstructure constructed in just 15 weeks Alternate Alternate Systems Systems - 25% reduction in construction schedule 2 5-story buildings with one crane Totaling 96,000 s.f. Structural Structural Redesign Redesign Cost and Cost and Scheduling Scheduling Recommendation Recommendation Arlington Gateway Hotel Arlington Gateway Hotel Arlington, Virginia Arlington, Virginia Michael Gray Michael Gray Structural Option Structural Option Recommendation – The use of Girder-Slab Technology Introduction Introduction - Reduces construction schedule over CIP Background Background - Reduces overall weight of structure by 40% Current Structure Current Structure - Reduced cost - Innovative use of steel Alternate Alternate Systems Systems Got Structural Structural Questions? Redesign Redesign Cost and Cost and Scheduling Scheduling Recommendation Recommendation 3
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