Fire Station 3 Historic Backup — original pdf

Backup

City of Austin Fire Station No. 3 Introductions and Context Alex Jenota, Project Manager Flintco – General Contractor Historic Landmark Commission – Design Overview Presentations 24 May 2021 Outline Introductions and Context Alex Janota, Project Manager Flintco – General Contractor Structural Damage Barry Krieger, Principal JQ Infrastructure – Structural Engineer Cost Implications and Alternatives Michelle Noriega, Project Manager City of Austin – Client Design Proposal Rob Robbins, Studio Director WestEast Design Group – Architect The Plan Forward Tony Haden, Division Chief Austin Fire Department – End User Context Location: 201 West 30th St Currently, all fire trucks are being parked outside the apparatus bay. Recent changes to the floodplain maps cause a significant portion of the building to be in the floodplain. Overview Construction completed on February 21, 1957 Architect: Roy Thomas Does not have any Landmark designations at present Adjacent to the Aldridge Place Historic District Historic An historic survey of the area was conducted. This building was identified in the survey. Recommendations for landmark were included. Reasoning: Possesses integrity and significance in Postwar Infrastructure Expansion. Neighborhood Engagement We presented the design proposal to the North University Neighborhood Association (NUNA) and the Aldridge Place Historic District. Meeting conducted through Zoom on May 3, 2021. Follow up questions were answered through email. Repairable Not Repairable Damage The building has suffered two types of structural damage: 1) General wear and tear based on age. (entire structure) 2) Overstressing of the foundation due to parking trucks that are heavier than the original design load. (apparatus bay only) Shore up and preserve Demolish and replace Intent For the areas that have just suffered age- related wear and tear, the intent is to shore up that portion of the structure and preserve it. For the apparatus bay, the intent is to demolish the portion of the building that is beyond repair and replace it with a new structure that is sensitive but of its time. Goals and Objectives 1) Save the historic fabric that can be saved and put it in good structural standing for the future. 2) Preserve the original historic use/function of the building. 3) Provide the Fire Department and EMS with the modern facility they need to operate effectively and efficiently for decades to come thus providing vital life-safety services to the area. 4) Get the fire trucks parked indoors for protection of the equipment, speed of response times, and aesthetic improvement of the neighborhood. 5) Create an addition that is respectful of the original, but not a false recreation of mindless mimicry. City of Austin Fire Station No. 3 Structural Damage Barry Krieger, Principal JQ Infrastructure – Structural Engineer Historic Landmark Commission – Design Overview Presentations 24 May 2021 Documents and Studies Phase One – Structural Floor System Capacity Assessment CTL Group May 2017 CTL Group August 2017 Phase Two – Feasibility Study Letter of Recommendation Karim Helmi, P.E., City Structural Engineer, CoA Public Works Department September 2017 Geotechnical Report Kleinfelder October 2018 Total of 164 pages Methodologies (cid:127) Ground Penetrating Radar (cid:127) Localized Concrete Removal (cid:127) Visual Observation (cid:127) Core Samples (cid:127) Compressive Strength Testing (cid:127) Carbonation Depth Testing (cid:127) Geotechnical Borings Deficiencies (cid:127) Cracks (cid:127) Spalling (cid:127) Exposed, rusted reinforcing steel (cid:127) Carbonation depths exceed the depth to the reinforcing steel (cid:127) Calculations of necessary design loads far exceed that of the current structure (cid:127) All options for repair were considered costly, risky, and/or ineffectual Conclusions (cid:127) Trucks cannot be parked on the slab (cid:127) Misalignment of one of the trucks could cause failure of the slab (cid:127) Demand Capacity Ratio for the middle beam in shear is 3.86 meaning it is overloaded by almost 300% (cid:127) The city’s Structural Engineer concluded that demolition and replacement was the best option City of Austin Fire Station No. 3 Cost Implications and Alternatives Michelle Noriega, Project Manager City of Austin – Client Historic Landmark Commission – Design Overview Presentations 24 May 2021 Alternate With the designation of the new 100-year floodplain, the remaining buildable area is extremely limited. (Shown in red) This means the only available land for a new apparatus bay is the land where the existing damaged one stands. Expansion is limited to the red area to the right of the current bay. Original Recommendation “Due to the degree to which the slab and middle beams are overloaded in conjunction with the presence of carbonation- induced corrosion, we do not believe that repair/strengthening of the garage floor system at Fire Station No. 3 can be accomplished in a cost-effective manner without substantial replacement of framing elements.” From page 42 of the unedited reports provided for commission review CTL Group, August 31, 2017 Cost Confirmation (cid:127) (cid:127) The CTL Group determined that the repair could not “be accomplished in a cost-effective manner” but never cited any cost analysis to back up the conclusion. (cid:127) A line-item costing model was developed to quantify the terms in the 2017 report. The additional costs associated with repairing the apparatus bay was determined to be $864,099. Funding and Cost Analysis (cid:127) The funded budget for the current project, which includes the demolition of the apparatus bay is: $3,133,168 (2,859 SF @ $1,096/SF) (cid:127) Costs to repair the existing bay is: $3,997,267 (2,246 SF @ $1,780/SF) (cid:127) Repairing the bay verses replacing it represents an unfunded cost overrun of: $864,099 (28% by project cost calculation) or $684/SF (62% by cost-per-square-foot calculation) City of Austin Fire Station No. 3 Design Proposal Rob Robbins, Studio Director WestEast Design Group – Architect Historic Landmark Commission – Design Overview Presentations 24 May 2021 Existing With the designation of the new 100-year floodplain, the remaining buildable area is extremely limited. (Shown in red) This means the only available land for a new apparatus bay is the land where the existing damaged one stands. Expansion is limited to the red area to the right of the current bay. Proposed Apparatus bay is expanded into the building area to the right of the plan. Parking in front is reconfigured to meet ADA. Site lighting is added for safety, convenience, and function. Design Importance of roof line Use of brick, but in an obviously different blend to distinguish old from new Reuse of original signage Compatible massing Use of period-appropriate detailing Addition of “UT Burnt Orange” elements to tie into area pride Improvements Faster operating bay doors to improve response times. Addition of spaces to provide for operational requirements. Significantly stronger structure accommodating the weight of both current and future vehicles. Slightly higher apparatus bay allowing for the height of new vehicles and the maintenance clearances they require. Improved site lighting and ADA compliance. City of Austin Fire Station No. 3 The Plan Forward Tony Haden, Division Chief Austin Fire Department – End User Historic Landmark Commission – Design Overview Presentations 24 May 2021 The Need 1) The apparatus bay is structurally compromised and cannot be reasonably repaired. 2) We need to be able to park our trucks inside. 3) The land is not big enough to locate a new apparatus bay elsewhere on the site. 4) We do not have another site to move to. 5) For life safety and operational efficiency, we need to be able to bring this facility up to current standards. 6) The funds to repair the bay are not available, and even if they were, the current bay does not provide adequate facilities for the future. What We Are Asking For 1) We need approval for the demolition of the apparatus bay. 2) Without landmark designation, we need the commission to allow the building department to issue a demolition permit. 3) If landmark designation is initiated, we still need the demolition permit, but we will also need a certificate of appropriateness for the new structure. 4) We are asking for a timely decision such that construction can proceed and delays to the fire department’s needs are not unduly extended. 5) We are asking for advice and counsel as to anything we may do on our end to help facility the requests we are making. City of Austin Fire Station No. 3 Thank You Historic Landmark Commission – Design Overview Presentations 24 May 2021