RiverView Condominiums II Chicago, IL

1. RiverView Condominiums IIChicago, IL Introduction Problem Structural System Redesign Breadth Work Conclusions Emily Whitbeck – AE Senior Thesis 2005

2. RiverView Condominiums IIChicago, IL Presentation Outline Building Introduction Problem Outline Solutions Structural Mechanical Acoustical Conclusions Introduction Problem Structural System Redesign Breadth Work Conclusions Emily Whitbeck – AE Senior Thesis 2005

3. RiverView Condominiums IIChicago, IL Building Introduction - High-End Residential High-Rise - 5 levels of parking + 27 story luxury condominium tower - 640,000 sq. ft. of occupied space in tower - $120 million - Design Architect – DeStefano + Partners - Structural Engineer – Chris P. Stefanos - Owner – MCL Properties - Location: North Side of the Chicago River, blocks from Lake Erie Introduction Problem Structural System Redesign Breadth Work Conclusions Phase I complete, Phase II under construction in August Emily Whitbeck – AE Senior Thesis 2005

4. RiverView Condominiums IIChicago, IL Building Introduction Parking Layout Introduction Problem Structural System Redesign Breadth Work Conclusions Tower Layout Emily Whitbeck – AE Senior Thesis 2005

5. RiverView Condominiums IIChicago, IL Building Introduction Existing Gravity Structural System - flat-plate reinforced concrete floors supported on reinforced concrete columns Existing Lateral Structural System - reinforced concrete shear walls located in three cores and other locations spaced throughout the building Introduction Problem Structural System Redesign Breadth Work Conclusions Emily Whitbeck – AE Senior Thesis 2005

6. RiverView Condominiums IIChicago, IL Problem Statement Goals of the Redesign 1 – minimize floor-floor height without changing floor-ceiling clearance 2 – avoid changing the architectural layout or façade, as well as the integration with phase I 3 – open up the layout of the floors by removing columns and shear walls from apartments and some parking areas 4 – improve the overall quality of life for occupants Introduction Problem Structural System Redesign Breadth Work Conclusions Emily Whitbeck – AE Senior Thesis 2005

7. RiverView Condominiums IIChicago, IL Outline of Redesigns Structural System Depth Study - change the gravity system to post-tensioned concrete • change the shear wall layout Mechanical System Breadth Study • install an additional return air vent in the corridor for each condominium • change fan coil units to minimize ceiling-floor section depth Acoustical Analysis of the Mechanical System • check the air ducts against the room criteria method - check the interface zones at supply air vents and return air grilles Introduction Problem Structural System Redesign Breadth Work Conclusions Emily Whitbeck – AE Senior Thesis 2005

8. Methods investigations of other systems investigation of post-tensioning ADAPT leads to several different combinations of depth and span Results Of the systems originally designed, two were studied further 7 ½” slab with a 40’ span, reduces the section depth by 1” per floor, but 40’ is not far enough to remove any columns or move shear walls 8 ½” slab with a 45’ span, does not change the section depth, but a 45’ span does allow the removal of several of the columns RiverView Condominiums IIChicago, IL Structural Gravity System Redesign Introduction Problem Structural System Redesign Breadth Work Conclusions Emily Whitbeck – AE Senior Thesis 2005

9. RiverView Condominiums IIChicago, IL Structural Lateral System Redesign Methods • investigation of existing shear walls using ETabs • different combinations of existing and new walls considered Results • based on smaller ceiling-floor section depth, lateral loads on the building decreased • different groupings of existing and new walls considered for new system Introduction Problem Structural System Redesign Breadth Work Conclusions Emily Whitbeck – AE Senior Thesis 2005

10. RiverView Condominiums IIChicago, IL Mechanical System Redesign • Outdoor Air Supply • - Existing system • Goal of the Redesign • Install one additional air return vent per condominium in the • corridor, creating indirect outdoor air supply • Costs $120 per condominium, considered a valuable addition • to quality of life Fan Coil Units • Existing system • Goal of the Redesign • Same manufacturer creates a ceiling profile model with plenum that is only 10 ½” deep • Reduces the ceiling-floor section by 5 ½” and the overall height of the building by about 17’ Introduction Problem Structural System Redesign Breadth Work Conclusions Emily Whitbeck – AE Senior Thesis 2005

11. RiverView Condominiums IIChicago, IL Acoustical Analysis of the Mechanical System • reasons • the Room Criteria Method, RC method • what is the RC for ducts? • what is the RC for the interface zones? • what can be done to mediate problems? Introduction Problem Structural System Redesign Breadth Work Conclusions Emily Whitbeck – AE Senior Thesis 2005

12. RiverView Condominiums IIChicago, IL Conclusions Structural • Redesign of the slab allowed longer spans • Smaller lateral loads and a shorter building allowed changes to the lateral system Mechanical • Streamlined the system and improved quality while maintaining value Acoustical • Determined that there are problems with the interface zones • Suggested ways to improve these areas Overall • high-rise residential considerations • Priorities/secondary items Introduction Problem Structural System Redesign Breadth Work Conclusions Emily Whitbeck – AE Senior Thesis 2005

13. RiverView Condominiums IIChicago, IL Thank You To my classmates who got me through the last 5 years To the faculty and staff of the AE department who work endlessly to help us To my friends and family who make it all worthwhile To the wonderful people at DeStefano + Partners, Chris P. Stefanos Associates, and Environmental Systems Design Introduction Problem Structural System Redesign Breadth Work Conclusions Emily Whitbeck – AE Senior Thesis 2005

14. RiverView Condominiums IIChicago, IL Questions? Shoot Introduction Problem Structural System Redesign Breadth Work Conclusions Emily Whitbeck – AE Senior Thesis 2005