OREGON STATE UNIVERSITY Memorial Union Access Improvement Study. October 21, 2013

Transcription

1 OREGON STATE UNIVERSITY Memorial Union Access Improvement Study October 21, 2013

2 OREGON STATE UNIVERSITY Memorial Union Access Improvement Study October 11, 2013 CONTENTS DESIGN OPTIONS EXECUTIVE SUMMARY EXISTING BUILDING PLAN OPTION 1 OPTION 2A & 2B OPTION 3 OPTION 4 OPTION 5 APPENDIX STRUCTURAL SKETCHES & NARRATIVES COST ESTIMATES

3 Executive Summary Project Name: Project Number: OSU Memorial Union Rotunda Access Improvement Study Date: 10/11/2013 Oregon State University contracted with FFA Architecture & Interiors to provide services for an ADA upgrade feasibility study for the historic Memorial Union building. The scope of services for the project included meetings with OSU and Memorial Union constituents, development of design options, evaluation recommendations, structural implications, and cost estimating. To date, the barriers had been identified by previous ADA assessments commissioned by OSU, and OSU anticipated there were likely different options or approaches to improving the building s accessibility. The study focused on the building s northern entry, its connection to the Rotunda, and pinch-points existing between the Rotunda and the Gallery/Hall spaces to the east and west. The historic east/west corridor was located behind the Rotunda. A remodel done in the late 1970 s added the ramps currently in the Rotunda space and created the choke points that exist today. The Memorial Union s exterior is considered a historic resource, however a more significant amount of design freedom is understood to be allowed on the interior. For pragmatic, functional and budgetary reasons, restaurants currently located behind the Rotunda were considered off-limits for major modification. The study produced five (5) distinct design options for addressing accessibility at the Memorial Union. Structural narratives and sketches where appropriate were provided by KPFF Consulting Engineers. Construction cost estimates for each option were provided by Architectural Cost Consultants, LLC.

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6 Option 1 Project Name: Project Number: OSU Memorial Union Rotunda Access Improvement Study Date: 10/21/2013 Description: Option 1 rebuilds the access ramps in approximately their current locations, with design modifications as required to meet current building codes. Existing ramps and related handrails are demolished. The existing floor/stair landing structure between the ramps is demolished and reconstructed so as to be lowered 6 to eliminate the existing step down at the exterior doors while reducing the total amount of rise required by the ramps. The existing exterior doors are modified to extend the depth of their bottom rail in compensation for the 6 elevation reduction. New code-compliant ramps and handrails are constructed at a 1:12 slope and with 5 x 5 landings. One riser is removed at each stair adjacent to the ramps, and one riser is added to the central rotunda stair, with guardrail extensions on each side to match the existing finishes. Pros: Cons: Interior floor & exterior landing are at same level. Provides code-compliant accessibility. Moderate impact to existing structure and finishes. Significant structural floor demolition & reconstruction is required. Disruption of storage space in basement. Modifications to existing historic entry doors. Circulation pinch points are not alleviated. Budget: Pending cost consultant.

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9 Option 2A & 2B Project Name: Project Number: OSU Memorial Union Rotunda Access Improvement Study Date: 10/21/2013 Description: Option 2 raises the elevation of the exterior landing to eliminate the 6 step at the exterior door threshold. This results in an additional riser at the top of the existing exterior stairs. Existing interior ramps, related handrails and three-riser side stairs are demolished, and the lobby floor level is modified to match the entry level elevation. Flanking stairs down to the lower level will require (3) new risers to meet the elevated lobby floor. Openings in east and west rotunda walls are modified, shifting them north to the exterior wall, and raising their head heights 18. Existing structural columns adjacent to these openings will be demolished and corresponding existing beams will require structural modifications. Option 2A: At Hall H54 and Gallery H56, new walks are constructed to be sloped at 1:20. No handrails or guardrails are required for this sloping floor. Double doors into Seating 64 and Vendor 63 are relocated to bays beyond the extent of new sloped walks. At Hall H54, (3) new risers are constructed 18 down to back hall. Existing walls running north/south to backside of columns at Hall H54 and Gallery H56 are removed to open up space on and around new sloped walks. Cons: Access to Hall H56 via stair. Major structural demolition of existing columns & modification of existing beams is required. Potential basement foundation footing engineering and reinforcing (pin piles) required due to elimination of significant existing columns. Disruption of storage space in basement and potential use/access of pin pile installation equipment for foundation footings. Openings at east and west walls of rotunda are still narrow circulation pinch points not alleviated. Double doors to Seating 64 and Vendor 63 must be relocated, affecting their operations & requiring significant remodeling. Budget: Pending cost consultant Pros: Option 2B: In lieu of sloping walks at Hall H54 and Gallery H56, for each a shorter ramp at 1:12 and a (3) riser stair are provided on either side of the column line. Guardrails and handrails are required. At Hall H54 a wall is relocated to accommodate the ramp width south of the column line. Provides code-compliant accessibility. Circulation pinch points within the rotunda are eliminated. Interior floor & exterior landing are at same level.

10 Option 2A Option 2B

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15 Option 3 Project Name: Project Number: OSU Memorial Union Rotunda Access Improvement Study Date: 10/21/2013 Description: Option 3 installs a new 2-stop holeless hydraulic elevator in the location of HC Bath 65 and forgoes any modification to the rotunda circulation, stairs or ramps. The new elevator would connect the mezzanine level at Hall H57 to the first level Main Concourse L102. A new HC Bath is constructed in the location of existing Jan 65B. At the ground level, the elevator pit space is constructed with impacts to rooms Locker 36, Aid 36A and Lounge 35. Pros: Cons: Minimal disruption to existing historic finishes. Circulation pinch-points and non-conforming accessible path-of-travel through existing rotunda remain unaddressed. Janitor room at Mezzanine Level is lost. Meeting Room at First Floor level is lost. Programmed spaces at Ground Level: Aid, Lounge and Locker rooms are impacted. Requires reconstruction of new accessible restroom Moderate disruption to existing structure, potential concrete elevator pit bearing walls and foundation footings due to elevator shaft having to support disrupted existing floor beams Disruption of ground level due to concrete wall and footing construction. Budget: Pending cost consultant.

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19 Option 4 Project Name: Project Number: OSU Memorial Union Rotunda Access Improvement Study Date: 10/21/2013 Description: Option 4 builds on the design of Option 2, raising the elevation of the exterior landing to eliminate the 6 step at the exterior door threshold. This results in an additional riser at the top of the existing exterior stairs. Existing interior ramps, related handrails and three-riser side stairs are removed, and the lobby floor level is modified to match the entry level elevation. Flanking stairs to lower level are overlaid with new stair profile and finishes, shifting them south, their intermediate landings eliminated. Openings in east and west rotunda walls are widened to the south and their head heights raised 18. Existing structural columns adjacent to these openings are unaffected, although associated existing beams have to be modified. At Hall H54 and Gallery H56, new walks are constructed to be sloped at 1:20. No handrails or guardrails are required for this slope. Double doors into Seating 64 and Vendor 63 are relocated to bays beyond the extent of new sloped walks. At Hall H54, (3) new risers are constructed 18 down to back hall. Existing walls running north/south to backside of columns at Hall H54 and Gallery H56 are removed to open up space on and around new sloped walks. At the lower level, existing doors and jambs are removed at the bottom of each stair, as new overlaid stairs are constructed. New solid walls and glass walls are used to create vestibules at the bottom of each stair landing. Pros: Cons: Use of new overlay floor and stair profile minimizes structural demolition and rebuild. Provides code-compliant accessibility. Circulation pinch-points within the rotunda are eliminated. Interior floor & exterior landing are at same level. Minimal disruption to ground level storage below rotunda. Access to Hall H56 via stair. Double doors to Seating 64 and Vendor 63 must be relocated, affecting their operations and requiring significant remodeling. Remodel of stair landings and enclosures at lower level Ballroom access. Construction of overlaid new stairs over existing stair structure with significant historic finishes replication. Budget: Pending cost consultant.

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22 Option 5 Project Name: Project Number: OSU Memorial Union Rotunda Access Improvement Study Date: 10/21/2013 Description: Option 5 is a variation of Option 4, raising the elevation of the exterior landing to eliminate the 6 step at the exterior door threshold. This results in an additional riser at the top of the existing exterior stairs. Existing interior ramps, related handrails and three-riser side stairs are removed, and the lobby floor level is modified to match the entry level elevation. Flanking stairs to lower level are filled as required and built-over, shifting them south, their intermediate landings eliminated. Openings in east and west rotunda walls are widened to the south and their head heights raised 18. Existing structural columns adjacent to these openings are unaffected. At Hall H54 and Gallery H56, new accessible ramps are constructed to be sloped at 1:12. New handrails are required for this slope. Double doors into Seating 64 and Vendor 63 do not need to be relocated. Existing walls running north/south to backside of columns at Hall H54 and Gallery H56 are removed to allow travel adjacent to new ramps. At the lower level, existing doors and jambs are removed at the bottom of each stair, as new overlaid stairs are constructed. New solid walls and glass walls are used to create vestibules at the bottom of each stair landing. Pros: Cons: Use of new overlay floor and stair profile minimizes structural demolition and rebuild. Provides code-compliant accessibility. Circulation pinch-points within the rotunda are eliminated. Access points to Vendor 63 and Seating 64 are preserved. Access to Hall H56 Preserved. Interior floor & exterior landing are at same level. Minimal disruption to ground level storage below rotunda Remodel of stair landings and enclosures at lower level Ballroom access. Construction of overlaid new stairs over existing stair structure with significant historic finishes replication. Budget: Pending cost consultant

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