8621 Georgia Avenue Silver Spring, MD

8621 Georgia Avenue Silver Spring, MD

8621 Georgia Avenue Silver Spring, MD By: Nick Dastalfo Structural Option Advisor: Dr. Boothby Site Conditions Location Existing Site General Building Information Owner: Foulger-Pratt Development, LLC Number of Stories: 17 stories, 161 ft.

Size: 347,009 ft. Cost: $51 Million Structural Engineer: Holbert Apple Associates Construction: Beginning in 2015 Unique Features: Green Roof, Rooftop Pool Existing Structural System Gravity System: Columns vary in concrete strength Mild-reinforced two way slab with drop panels

Post-tensioned two way flat slab Lateral System: 7.25 depth, banded and distributed tendons Concrete shear walls Concrete Moment frames Foundation:

Spread Footings Typical Bay Typical Bay 7.25 posttensioned slab Columns: 16 x 24 Banded and distributed tendons 24-0 20-0 Gravity Spot Checks

-Punching Shear Punching Vc117.65k > Vu=93.1kVc117.65k > Vu=93.1k Punching Shear - Int. Column C6 Shear Ext. Column C1 Vc117.65k > Vu=93.1kVc103.04k > Vu=55.2k Gravity Spot Checks -One Way Shear 22-0 Direction

H=7.25 Vc117.65k > Vu=93.1kVc = 152.3k > Vu = 78.5k 202 C6 22-0 20-2 Direction

H=7.25 Vc117.65k > Vu=93.1kVc = 139.5k > Vu = 79.8k Gravity Spot Checks -Moment Capacity Deflection Control 0.317 < 0.8 Load balancing

Design Alternates Alternate #1: Two Way Flat Plate Slab Alternate #2: Composite Steel Alternate #3: Non-Composite Steel Two Way Flat Plate Slab Notes:

Thickness = 9 Rebar fy=60ksi, Concrete fc= 5ksi No drop panels Two Way Flat Plate Slab Depth Fire

Slight increase from 7.25 to 9 Meets at least 2 hr requirement No additional fireproofing Weight = 115 psf Cost Lateral Options

$19.84/SF $0.32 savings per SF Concrete SW and MF Conclusion Heaviest Limited depth Viable Option Composite Steel Notes:

24-0 20-0 Deck= 2VLI18, 5in. NW Concrete topping Shoring Required Composite Steel Depth

Increase from 7.25 to 21 Meets 2 hr requirement with 3.5 topping Fire-proofing needed on beams and deck Weight = 75 psf Cost Fire

Lateral Options $18.48/SF Cheapest Concrete SW or Steel MF Conclusion

Very Deep Shoring Viable but not efficient Non-Composite Steel Notes: 24-0 20-0 Deck= 1.5C18 3.5 NW Concrete Topping Non-Composite Steel

Depth Fire Increase from 7.25 to 21.5 Meets 2 hr requirement with 5 topping

Fire-proofing needed on beams and deck Weight = 60 psf Cost Lateral Options $27.60/SF Most expensive Concrete SW and MF

Conclusion Lightest Very Deep Viable Option Final Comparison Thank You! Questions?

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