Completed in 1932, the Potter County Courthouse is recognized as one of the most significant high-rise Art Deco courthouses in Texas, and among the most prominent in the country. Local architect W.C. Townes, of Townes, Lightfoot and Funk, designed the eight-story structure with a terra cotta fac?ade adorned in decorative figural and botanical bas-relief depicting the region’s cultural and natural history.
After more than 80 years of use, the courthouse was long overdue for an interior modernization and exterior restoration. The $15.5 million effort was undertaken as part of the Texas Historic Courthouse Preservation Program, a state-funded program that covered about one-third of the project’s cost. It included a complete fac?ade restoration—including repairing and re-anchoring damaged units and replacing mortar joints—and an overhaul of the interior spaces to meet current building and accessibility codes and the operational and functional needs of the county’s administrative offices and courts.
The original mechanical systems were replaced with a four-pipe scheme utilizing a 200-ton chiller and 250-ton cooling tower. An additional 60-ton, air-cooled chiller was placed on the roof, and 12 air-handling units were located on the various roofs at the fifth, sixth, and eighth floors. The new system, combined with automatic controls and enhanced thermal roof insulation, is expected to reduce energy costs by 20% annually.
POTTER COUNTY COURTHOUSE
Amarillo, TexasBuilding TeamSubmitting firm: JQ (structural engineer)Owner: Potter CountyArchitect: ArchiTexasMEP engineer: Johnson Consulting EngineersConstruction manager: Southwest General ContractorsGeneral contractor: Journeyman ConstructionGeneral InformationSize: 62,390 sfConstruction cost: $15.5 millionConstruction time: November 2009 to August 2012Delivery method: Design-bid-build
The Reconstruction Awards judges hailed the Building Team for its painstaking efforts in preserving the historical elements of the building while modernizing the structure. To accommodate the new mechanical systems and other modern amenities, such as fire/life safety systems, information technology infrastructure, and high-density shelving units, the team devised several creative structural solutions:
• Tunnel expansion. To preserve the courthouse’s original, first-floor terrazzo floors, the team utilized the facility’s underfloor utility tunnels to run new insulated piping. Deemed inadequate to handle the new systems, the existing tunnels had to be carefully reinforced and expanded. In total, more than 200 feet of concrete- and masonry-lined tunnel was added on to the existing layout, allowing for the terrazzo flooring to remain intact.
• Clay tile floor removal. The added weight of the rooftop mechanical units and high-density shelving meant that certain areas of the existing structure on floors two through six would need to be reinforced. However, because the plaster ceiling finish was applied directly to the original clay tile and reinforced concrete joist floor system, structural members could not be inserted below the original ceiling level.
The solution involved removing portions of the original clay tile forms to allow the installation of new steel beams constructed from steel T-sections between the existing concrete joists, thereby increasing the floor load capacity. The use of T-sections in lieu of standard wide-flange sections facilitated access for completion of field connections to the existing structure and the placement of non-shrink grout between the top of the steel members and the underside of the original floor slab to provide full load transfer.
• Use of CFRP strips. In order to accommodate new stairs, vertical chases, and mechanical infrastructure, numerous openings of various sizes had to be cut into the slab on floors seven and eight. The original floor structure on these levels is eight-inch reinforced concrete slabs spanning the concrete beams.
To maintain the structural integrity and continuity of the floor slabs, strips of laminated, 1?4-inch-thick carbon fiber reinforcement polymer (CFRP) were used to redistribute the loads adjacent to and around the openings. Larger openings for the stairs and chases called for additional reinforcement, and CFRP strips were placed on top or below the slab, corresponding to the tension zone of the slab system.
In several locations, strips were placed in both directions around the openings to properly distribute the load.
“We liked how the team carefully pre- served the clay-tile floor and the reinforced concrete slab with the strengthening schemes hidden out of sight,” said judge K. Nam Shiu, Senior VP, Director of Restoration Services, Walker Restoration Consultants (www.walkerrestoration.com). “They successfully provided up-to-date floor functionality while keeping the layout and look of the original building.”
The Building Team took careful measures to avoid disturbing the historical elements in the building. This included expanding an existing utility tunnel (above) and applying special structural reinforcement polymer to select concrete frame members (top). Photo: Brenda Bagot
Related Stories
| Dec 29, 2014
HDR and Hill International to turn three floors of a jail into a modern, secure healthcare center [BD+C's 2014 Great Solutions Report]
By bringing healthcare services in house, Dallas County Jail will greatly minimize the security risk and added cost of transferring ill or injured prisoners to a nearby hospital. The project was named a 2014 Great Solution by the editors of Building Design+Construction.
| Dec 29, 2014
New mobile unit takes the worry out of equipment sterilization during healthcare construction [BD+C's 2014 Great Solutions Report]
Infection control, a constant worry for hospital administrators and clinical staffs, is heightened when the hospital is undergoing a major construction project. Mobile Sterilization Solutions, a mobile sterile-processing department, is designed to simplify the task. The technology was named a 2014 Great Solution by the editors of Building Design+Construction.
| Dec 29, 2014
Startup Solarbox London turns phone booths into quick-charge stations [BD+C's 2014 Great Solutions Report]
About 8,000 of London’s famous red telephone boxes sit unused in warehouses, orphans of the digital age. Two entrepreneurs plan to convert them into charging stations for mobile devices. Their invention was named a 2014 Great Solution by the editors of Building Design+Construction.
| Dec 29, 2014
Spherical reflectors help spread daylight throughout a college library in Portland, Ore. [BD+C's 2014 Great Solutions Report]
The 40,000-sf library is equipped with four “cones of light,” spherical reflectors made from extruded aluminum that distribute daylight from the library’s third floor to illuminate the second. The innovation was named a 2014 Great Solution by the editors of Building Design+Construction.
| Dec 29, 2014
Hard hat equipped with smartglass technology could enhance job site management [BD+C's 2014 Great Solutions Report]
Smart Helmet is equipped with an array of cameras that provides 360-degree vision through its glass visor, even in low light. It was named a 2014 Great Solution by the editors of Building Design+Construction.
| Dec 29, 2014
Clayco lends operational support and financing to construction services startups [BD+C's 2014 Great Solutions Report]
Design-build firm Clayco has launched an investment arm called Treehouse Adventures to provide financing and operational infrastructure to startups, including those serving the AEC industry. The new venture was named a 2014 Great Solution by the editors of Building Design+Construction.
| Dec 29, 2014
Reef Worlds to build world’s largest underwater theme park for luxury resort [BD+C's 2014 Great Solutions Report]
Dubai is known for its gargantuan commercial building projects. The latest to be proposed is the world’s largest underwater theme park, designed and built by Reef Worlds. The project was named a 2014 Great Solution by the editors of Building Design+Construction.
| Dec 29, 2014
New data-gathering tool for retail designers [BD+C's 2014 Great Solutions Report]
Beacon technology personalizes smartphone messaging, creating a new information resource for store designers. It was named a 2014 Great Solution by the editors of Building Design+Construction.
| Dec 29, 2014
Leo A Daly's minimally invasive approach to remote field site design [BD+C's 2014 Great Solutions Report]
For the past six years, Leo A Daly has been designing sites for remote field stations with near-zero ecological disturbance. The firm's environmentally delicate work was named a 2014 Great Solution by the editors of Building Design+Construction.
| Dec 29, 2014
Wearable job site management system allows contractors to handle deficiencies with subtle hand and finger gestures [BD+C's 2014 Great Solutions Report]
Technology combines a smartglass visual device with a motion-sensing armband to simplify field management work. The innovation was named a 2014 Great Solution by the editors of Building Design+Construction.
