1. AT/FP Challenges in Renovation of Existing Military Facilities Presented by: David Dickey, PE

2. 2 Anti-Terrorism Standards  UFC 4-010-01

3. 3 Triggers for Compliance  Is compliance mandatory?  Not all renovations must comply with standards.  Triggers –Renovation costs > 50% Replacement Cost –Conversion of Use –Glazing Replacement Projects –Building Additions –Leased Buildings

4. 4 Information Gathering Site Investigations  Need all As-Built drawings –Including previous renovations  Budget for Site Visits –Entire design team should attend  Reduces RFI’s, Change Orders, and Conservative Bids

5. 5 Information Gathering Unforeseen Conditions  If no As-built drawings exist –Extensive site investigation required  Unknown materials –Masonry – Unreinforced? –Wood – species, size, spacing? –Concrete – strength? –Steel – grade? weldable?  Testing for material properties –X-ray, samples, destructive testing –Will the design contract fund?

6. 6 Information Gathering Unforeseen Conditions  Many items covered by interior finishes –Asbestos, electrical –Structure for window attachments  Is Selective Demolition possible?  Maintenance funding for patching?  Increase contingency to cover unforeseen conditions?  Unforeseen conditions can exceed 5% contingency quickly

7. 7 Civil / Site  Force Protection Barriers –Passive Curbs Fencing Hardscapes Cable Barriers Planters Bollards WVARNG - AFRC – Kingwood, WV

8. 8 Civil / Site  Barriers –Active Wedge barriers Pop-up bollards Source: www.multi-barrier.com Source: www.herculesfencenc.com

9. 9 Architectural  Eliminate external roof access  Main entrance facing installation perim. –Occupants may use different entrance, or –Screen the front entrance  Maintain Aesthetics

10. 10 Architectural / Civil  Fencing Source: www.ameristarfence.com

11. 11 Architectural / Civil  Landscaping Command & Control Fac. – Ft. Campbell, KY

12. 12 Architectural / Civil  Landscaping NOSC – El Paso, TX

13. 13 Mechanical  Enclose Units Within 33ft of Building NOSC – El Paso, TX

14. 14 Mechanical  Louver locations 10’ above ground –Not mandatory, but desirable –Could duct through roof –Use 2 nd floor space as Mech. Rm.  Bracing of suspended equipment –Difficult to access if ceiling is not being replaced

15. 15 Mechanical / Electrical Mailroom Addition  Requires dedicated ventilation and exhaust systems  Automatic shutoff with low leakage dampers  Tie controls into main DDC system

16. 16 Architectural / Structural Mailroom Addition  Seal Walls and Doors Well  Harden Walls for Mail Bomb Threat –Demo existing floor slab –New foundations

17. 17 Structural Prevent Progressive Collapse  For buildings 3 stories or more

18. 18 Civil / Site Standoff Distance  Biggest issue with existing facilities New guidance for New Reserve Facilities ALL standoffs = 148’

19. 19  Parking and Roadways –Provide access control at conventional standoff distance and restrict parking within Minimum standoff distance Civil / Site  Parking and Roadways –Move parking & roadways

20. 20 Civil / Site / Structural  Parking beneath building or on rooftop –Eliminate –Access Control –Blast analysis for Type II explosive Beneath – Reflected blast pressures Rooftop – No standoff distance to roof structure

21. 21 Architectural / Structural Window Replacement  Fragment retention films and blast curtains no longer acceptable Window Replacement  Fragment retention films and blast curtains no longer acceptable  Insulated Glazing Units –Laminated Glass

22. 22 Architectural / Structural  If Standoff Distances are met –Glazing, frames, components, anchors, and supporting structure must still meet UFC –Wall is considered conventional construction No wall retrofit necessary  If Standoff Distances are NOT met –Glazing, frames, components, anchors, and supporting structure must be designed for higher blast loads –Wall must be analyzed for blast pressures Wall/Building retrofit may be necessary

23. 23 Architectural / Structural Window Supporting Structure  Static Analysis –Extremely Conservative  Dynamic Analysis –Less conservative –Qualified blast engineer –Software is becoming easier to use SBEDS

24. 24 Structural  SBEDS software

25. 25 Structural  Results of Window Jamb Design  CASE: Brick wall with metal stud backup, 36”Wx48”H window, 15’ tall jamb –Dynamic Analysis One 6” deep 12 Gage stud required per jamb –Static Analysis Four 6” deep 12 Gage studs required per jamb  Recommend Using Dynamic Analysis for all projects – New and Existing

26. 26 Structural Retrofit Window Supporting Structure  Steel Tubes –Inset into building –Anchor to slabs below and above Difficult with weaker roof or floor system  Unreinforced Masonry Walls –Cut blocks, drill & epoxy rebar, grout solid –Grout solid and reinforce externally  Each project is different

27. 27 Key Points  Know Triggers  Info: As-built drawings – Site visits  Reduce Unforeseen Conditions  Site: Barriers, landscaping, aesthetics  Parking will be impacted  Dynamic vs. Static Analysis  Window Replacement  Influence of Standoff Distances  Each project is different