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111 Morgan St. Chicago, IL

111 Morgan St. Chicago, IL. Ryan Friis Structural Option. Presentation Outline. Existing Conditions Structural Redesign Cost Analysis Fire Protection Requirements Acoustics Construction Considerations. Owner: Architect: Engineers: GC:. Winthrop Properties, LLC.

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111 Morgan St. Chicago, IL

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  1. 111 Morgan St.Chicago, IL Ryan FriisStructural Option 111 Morgan St. Chicago, IL

  2. Presentation Outline • Existing Conditions • Structural Redesign • Cost Analysis • Fire Protection Requirements • Acoustics • Construction Considerations 111 Morgan St. Chicago, IL

  3. Owner: Architect: Engineers: GC: Winthrop Properties, LLC. Fitzgerald Associates Architects Samartano & Co. (Structural) Ketchmark & Assoc. (Mechanical) Ketchmark & Associates (Electrical) McClier Engineers (Civil) Walsh Construction of Illinois Project Team 111 Morgan St. Chicago, IL

  4. Location • Downtown Chicago • Corner of Adams & Morgan St. • 5 blocks west of the Sears Tower 111 Morgan St. Chicago, IL

  5. Building Info • 9 Story Condominium Building • Total Building Height - 98’-0” • 166 Units Located on 7 Floors • 180,000 Sq. ft. of residential space • Prices range from $200,000 – $450,000 • 184 Parking Spaces on 3 Floors 111 Morgan St. Chicago, IL

  6. Building Info Luxury Condominiums • 1, 2 or 3 Bedroom units • Oak hardwood floors • Granite countertops • Gas fireplaces in every unit • Walk-out balconies 111 Morgan St. Chicago, IL

  7. Residential Floor Plan 111 Morgan St. Chicago, IL

  8. Existing Conditions • Structural • 2-way Concrete slab gravity system • Typical bay size of 22’-0” x 25’-8” • 20” diameter columns of varying strength • Floor to floor height of 10’-9” • 8 in. shear walls located in cores 111 Morgan St. Chicago, IL

  9. Existing Conditions Structural Floor Plan 111 Morgan St. Chicago, IL

  10. Existing Conditions • Structural • Original Design - Chicago Building Code 1999 • Seismic Design not required • Redesign - IBC 2000 • Assume wind loads control 111 Morgan St. Chicago, IL

  11. Existing Conditions • Architectural • Exposed concrete structure • Unpainted mechanical ductwork and sprinkler piping 111 Morgan St. Chicago, IL

  12. Redesign Goals • Provide finished ceiling at 9’-6” minimum • Add 2 floors of residential units & 1 parking floor • Reduce column footprint • Keep existing floor plan intact • Avoid major cost increases • Use existing concrete parking garage 111 Morgan St. Chicago, IL

  13. Structural Redesign Gravity systems considered • Steel Joists • Standard W shapes • Composite W shapes 111 Morgan St. Chicago, IL

  14. Structural Redesign Composite Steel Design best choice • Saves 113 tons versus non-composite design • Allows for greater spacing than steel joist system • Easier to frame balconies with W shapes opposed to joists • Does not require a fire rated ceiling 111 Morgan St. Chicago, IL

  15. Structural Redesign • Framing plan • Beams span E-W • Span length 14’ to 30’ • Space 12’-9” o. c. • Beams cantilever over girder to create balcony framing Typical Framing Plan 111 Morgan St. Chicago, IL

  16. Composite Steel Design • Typical beam size • W12x19 [10] with ¾” camber & W14x30 [12] • 6.25” lightweight concrete deck on 3” decking • Beams cambered to account for wet concrete load • Live load member deflection limited to L/360 • Typical connection uses 1/4” shear tab with 3 - A325 N bolts and 3/16” weld 111 Morgan St. Chicago, IL

  17. Composite Steel Design • Floor to floor height increased to 12’-6” • Maintains 9’-6”’ ceilings • Leaves room for mechanical systems and provides space for finished drywall ceiling • Typical columns are W8 and W10 • Maximum column size 15”x13” when framed 111 Morgan St. Chicago, IL

  18. Structural Redesign • Floor vibrations of 0.43%g maximum • Overall building is lighter by 30% • Permits use of 6,000 psi concrete in parking garage • Down from 8000 psi in existing system • Existing caisson foundation can be used 111 Morgan St. Chicago, IL

  19. Structural Redesign Lateral Force Resisting System Options • Column layout prevents use of braced frames • Consider moment frames • Modify existing shear wall system 111 Morgan St. Chicago, IL

  20. Revised Lateral Design • Existing shear wall layout maintained • Shear walls increased in size from 8” to 12” in E-W direction • Walls remain 8” in N-S direction • Total drift limited to H/600 • Actual drift of 2.5” in E-W direction • All walls use 4,000 psi concrete 111 Morgan St. Chicago, IL

  21. Cost Analysis • Cost analysis for structural system • All costs calculated using R.S. Means and adjusted to 2001 dollars in Chicago, IL • Costs include material, labor, equipment, and overhead and profit 111 Morgan St. Chicago, IL

  22. Cost Analysis • Concrete cost per floor • $384,312 • Composite steel cost per floor • $476,190 ($390,700 excluding ceiling) • Includes: extra building façade $27,429 fireproofing $27,731 additional partition height $8,450 finished ceiling $85,500 • Cost Reductions • 6,000 psi concrete in garage and 4,000 psi concrete in remaining shear walls $38,000 111 Morgan St. Chicago, IL

  23. Fire Protection • 2 Hr. fire rating required between floors and units • As built • 8.5” two-way slab achieves fire rating • Steel system • 6.25” Slab on 3” USD Lok-Floor provides a 2 hr rating without fire proofing • 1 1/8”+ Spray-on Fire resistive material required on beams and columns (vermiculite based) • Walls between units need to extend slab to slab • Fireproofing in gaps created by corrugated deck 111 Morgan St. Chicago, IL

  24. Acoustics • Only minor changes between units on same floor • Transmission between floors is a concern STC IIC Acceptable: 60 54 Concrete: 65 60 Steel: 62 60 111 Morgan St. Chicago, IL

  25. Construction Considerations • Use same erection sequence as original system • Shear walls in North first then steel • Shear walls in South during steel erection in North • Schedule • Erection of first steel floor will take an additional week • Additional 6 weeks overall for 3 additional floors • Site management • Just in time delivery of steel for daily erection • Use alley on building’s east side to stage trucks 111 Morgan St. Chicago, IL

  26. Conclusions • Composite steel system • Accommodated 2 additional floors • Provided easy installation of ceiling • Reduced column size • Improved overall appearance of condo units • Structural system costs equivalent to existing 111 Morgan St. Chicago, IL

  27. Recommendation • Maximum luxury appearance is gained with the steel system • Due to the exposed columns in the existing system it is not worth adding the ceiling • If additional floors were added to the concrete system the columns could become larger 111 Morgan St. Chicago, IL

  28. Thank You • Dave Heselbarth & Walsh Construction • AE Faculty • 5th Year Students 111 Morgan St. Chicago, IL

  29. Questions 111 Morgan St. Chicago, IL

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