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Building Statistics Part 2 |
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| Construction |
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The Duval County Unified Courthouse Facility is a Design-Build Project that is owned by the City of Jacksonville. Turner Construction Company is the project's General Contractor. Construction of the facility began in May 2009 and the facility is expected to be completed in May 2012. The overall project is approximately $224 Million. |
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Structural
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Foundation: |
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Auger cast piles of 18" diameter with appropriate steel reinforcing extend either 55' below existing grade for typical foundations or 70' for lateral/tension piles. Various sized cast-in-place reinforced concrete pile caps cover the piles. These depths range from 42" to 75" deep. Cast-in-place reinforced concrete grade beams are used around the perimeter to support a foundation wall under the slab-on-grade. These grade beams also serve to support the exterior precast concrete facade elements. |
Superstructure: |
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The main structure is supported by cast-in-place reinforced concrete columns and beams. The columns range in size from 16" x 24" to 24" x 28" and extend from the pile caps up to the roof levels. The elevated cast-in-place reinforced concrete slabs, typically 5" thick, are supported by either cast-in-place reinforced concrete beams or joists. The concrete beams range in size from 19" x 29" to 36" x 29" and the concrete joists are typically sized at 8" x 29". Cast-in-place reinforced concrete shear walls extend from lateral piles and caps up to the roof levels at various locations such as around staiwells and elevator shafts. |
Roof: |
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The main flat composite roof system is supported by cast-in-place reinforced concrete roof slabs which are supported by the same aforementioned column, beam, and joist system that supports floor slabs. The entrance and central upper roofs that use a standing seam metal roof decking system are supported by steal beams and columns that connect to the concrete superstructure below. |
Wind Loads: |
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Structural considerations for wind loading had to be taken into account due to the likelihood of high velocity winds in this area of Florida. The following diagrams (Figures 1 & 2) of the building and the following chart (Figure 3) give the wind loads of the facility. |
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Figure 1: Wall Wind Pressure Zones |
Figure 2: Roof Wind Pressure Zones |
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Figure 3: Wind Pressures |
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| Mechanical |
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Air Side: |
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The Duval County Unified Courthouse Facility utilizes 25 Air Handling Units (3,300 to 50,000 CFM) to distribute air throughout the building. The 51 courtrooms are served by 14 AHU's while the other 11 AHU's serve the remainder auxiliary areas of the building. All AHU's are served with outdoor air by three Makeup Air Units (40,000 CFM), two of which are heat recovery units that exchange sensible and latent heat with the exhaust air. Most units are located on the interior of the building in mechanical rooms or penthouses with the exception of two AHU's and two MAU's which are all located on separate mechanical pads on the second floor roof. |
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Most areas are served by Variable Air Volume AHU's with terminal VAV boxes in the zones. The VAV boxes also utilize terminal reheat coils. The exceptions to the VAV systems are the four courtrooms located on the third and fourth floors at the northern side of the building. Each of these four courtrooms is served by its own Constant Air Volume Unit. Fan Coil Units are also utilized in some corridors and spaces for additional conditioning. |
Water Side: |
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Heating hot water used by AHU heating coils, terminal VAV boxes, and Fan Coil Units is generated by two natural gas boilers in a first floor mechanical room. Each boiler has an output of 13,390 MBH. Chilled water is supplied by J.E.A. Public Utility Company. The chilled water is pumped from a central pumping room to the AHU cooling coils and Fan Coil Units. |
Fire Protection: |
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The facility uses combination standpipes with wet and dry pipe systems that are connected to a building fire alarm system. Water used for fire suppression is supplied by the J.E.A. Ciy Fire Protection Water Service. |
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| Electrical |
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The electrical service is provided by the J.E.A. Public Utility Company. Four transformers of 2500 kVA each are provided by the utility company for the facility. Each transformer feeds into its own main switchgear that serves a separate quadrant of the building. An emergency generator is located on site and is capable of providing 1875 kVA. |
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| Lighting |
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The Duval County Unified Courthouse Facility is primarily lit using fluorescent lighting. This includes T8, high output T5, and CFL systems. The lighting power density has been estimated through analysis in ASHRAE Standard 90.1 as 1.21 Watts/square foot. Metal Halide lighting is also used for exterior lighting and landscaping. |
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