Senior Thesis Structural Option Ryan Friis Spring Morgan St. Chicago, IL 111 Morgan St. Chicago, IL Ryan Friis Structural Option

Senior Thesis Structural Option Ryan Friis Spring Morgan St. Chicago, IL Presentation Outline Existing Conditions Structural Redesign Cost Analysis Fire Protection Requirements Acoustics Construction Considerations

Senior Thesis Structural Option Ryan Friis Spring Morgan St. Chicago, IL Project Team 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

Senior Thesis Structural Option Ryan Friis Spring Morgan St. Chicago, IL Location Downtown Chicago Corner of Adams & Morgan St. 5 blocks west of the Sears Tower

Senior Thesis Structural Option Ryan Friis Spring Morgan St. Chicago, IL 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, Parking Spaces on 3 Floors

Senior Thesis Structural Option Ryan Friis Spring Morgan St. Chicago, IL Building Info 1, 2 or 3 Bedroom units Oak hardwood floors Granite countertops Gas fireplaces in every unit Walk-out balconies Luxury Condominiums

Senior Thesis Structural Option Ryan Friis Spring Morgan St. Chicago, IL Residential Floor Plan

Senior Thesis Structural Option Ryan Friis Spring Morgan St. Chicago, IL 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

Senior Thesis Structural Option Ryan Friis Spring Morgan St. Chicago, IL Existing Conditions Structural Floor Plan

Senior Thesis Structural Option Ryan Friis Spring Morgan St. Chicago, IL Existing Conditions Structural  Original Design - Chicago Building Code 1999  Seismic Design not required  Redesign - IBC 2000  Assume wind loads control

Senior Thesis Structural Option Ryan Friis Spring Morgan St. Chicago, IL Existing Conditions Architectural  Exposed concrete structure  Unpainted mechanical ductwork and sprinkler piping

Senior Thesis Structural Option Ryan Friis Spring Morgan St. Chicago, IL 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

Senior Thesis Structural Option Ryan Friis Spring Morgan St. Chicago, IL Structural Redesign Gravity systems considered Steel Joists Standard W shapes Composite W shapes

Senior Thesis Structural Option Ryan Friis Spring Morgan St. Chicago, IL 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

Senior Thesis Structural Option Ryan Friis Spring Morgan St. Chicago, IL 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

Senior Thesis Structural Option Ryan Friis Spring Morgan St. Chicago, IL Composite Steel Design Typical beam size 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

Senior Thesis Structural Option Ryan Friis Spring Morgan St. Chicago, IL 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

Senior Thesis Structural Option Ryan Friis Spring Morgan St. Chicago, IL 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

Senior Thesis Structural Option Ryan Friis Spring Morgan St. Chicago, IL Structural Redesign Lateral Force Resisting System Options Column layout prevents use of braced frames Consider moment frames Modify existing shear wall system

Senior Thesis Structural Option Ryan Friis Spring Morgan St. Chicago, IL 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

Senior Thesis Structural Option Ryan Friis Spring Morgan St. Chicago, IL 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

Senior Thesis Structural Option Ryan Friis Spring Morgan St. Chicago, IL 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 concrete in remaining shear walls $38,000

Senior Thesis Structural Option Ryan Friis Spring Morgan St. Chicago, IL 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

Senior Thesis Structural Option Ryan Friis Spring Morgan St. Chicago, IL Acoustics Only minor changes between units on same floor Transmission between floors is a concern STCIIC Acceptable: 6054 Concrete: 6560 Steel: 6260

Senior Thesis Structural Option Ryan Friis Spring Morgan St. Chicago, IL 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

Senior Thesis Structural Option Ryan Friis Spring Morgan St. Chicago, IL 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

Senior Thesis Structural Option Ryan Friis Spring Morgan St. Chicago, IL 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

Senior Thesis Structural Option Ryan Friis Spring Morgan St. Chicago, IL Thank You Dave Heselbarth & Walsh Construction AE Faculty 5 th Year Students

Senior Thesis Structural Option Ryan Friis Spring Morgan St. Chicago, IL Questions