Overall Existing Conditions Summary

Transcription

1 September 12, 2002 Overall Executive Summary: The multi-use project on 250 West Street is a 7-story building with space for offices, retail, storage and parking. The project is a small part of the development of the Arena District in Columbus, OH. Most of the interior of the building is unfinished with the exception of the lobby, basement, and center core. Its tall narrow brick columns give a sense of greater height to the building and are supplemented by metal panels and glass to form the exterior of the building. Structurally, the building is supported by a steel superstructure with a concrete foundation. A variable air volume mechanical system is utilized to provide the occupants with a comfortable environment to work and shop. The electrical system is fed by a 480/277 volt, 3 phase system and is then stepped down at each floor when required. The lighting in the building has only been completed for the basement, lobby, building core and exterior with a combination of fluorescent, HID and low voltage fixtures. The building is fully equipped with sprinklers to protect it from fire damage. The Multi-Use Project on 250 West Street in Columbus, Ohio was designed to provide a space for several uses; just as it s name suggests: it is a 7-story building with spaces for parking, storage, retail and offices. Predominately the building was designed for office space with the only exceptions being the basement, which allows room for storage and public parking and half of the first floor, which permits area for retail space. The design team and developer have come up with a scheme to allow for the future development of the unfinished spaces in the building. The entire project is being developed by Nationwide Reality Investors with the expertise of several design professionals. Acock Associates Architects, LLC was hired to develop the architectural scheme of the project while the structural engineering was done by Jezerinac Geers & Associates, Inc. Evans, Mechwart, Hambleton & Tilton, Inc. performed the civil engineering duties and Prater Engineering Associates designed the mechanical and electrical systems. The final member of the design team was the landscape architect Myers-Schmalenberger/MSI. Once the design documents were completed they were sent out for construction bids. Messer

2 Construction was hired and subsequently issued construction documents dated February 22, 2002 to build the project which has a total cost of million. The building is currently being built and recently topped off the steel. The project sits on a city block in the Arena District of Columbus, Ohio that slopes roughly 6 feet from the northeast down to the southwest corner of the building footprint. To the north of the building rests an existing building labeled D, while to the east of the project is the existing cinema and parking garage. The south and west sides of the building are open with the site for future building F to the south and West Street and Arena Park to the west. The site for building F will be used as a staging area for the project. The foot print of the project takes up a space that is roughly 194 feet long in the north/south direction and 100 feet wide in the east/west direction and is designed and built in accordance with the 1999 edition of the Ohio Basic Building Code. Like previously stated, it is a 7-story building with a partial basement. Direct access to the parking area is achieved from the existing parking structure by an opening in the basement adding a total of 22 additional parking spaces. Also in the basement is a 1400 square foot storage area for tenants, which is divided into individual storage areas by chain link fence. The final area in the basement includes the stairs and elevators. The upper seven stories of the building house the office and retail space. The first floor of the building is designed to accommodate both retail and office space. A stone-finished main corridor runs from the east to west directly in the center of the building. At each end of the corridor are covered entrances with the main entrance at the west end. Just inside the main entrance is an oval-shaped lobby as the focal point in the corridor. Directly in the middle of the corridor is the central core of the building. The core encloses the 2 sets of stair and 4 elevators. 2

3 Also inside the core are the bathrooms, mechanical chases and the electrical/data room. On the north side of the corridor lies the unfinished retail space with an additional entrance in the northeast corner of the building. The remaining space in the southern end of the building holds for offices. The center core of the building runs up to through each floor and is surrounded by unfinished office space on floors 2-7. For the most part, the building is just a shell until tenants can be lined up and their required layout determined. The exterior of the building is a combination of brick columns, glass, and metal panels. Each side of the building has narrow brick columns the full height of the building, giving the illusion that the building appears taller than it actually is. The columns have a slight recess in the middle that is accented with limestone squares at the top and bottom. Also, each column is stepped in on all three exposed sides at both the 6 th and 7 th floors with limestone accents. This again adds to the verticality of the building. An exception to this is the west elevation where a cantilevered balcony/terrace occurs on the 7 th floor. The balcony is surrounded with a metal guardrail with glass infills. As a result of the balcony, the columns beneath it are a little different than the rest of the columns. Instead of being stepped at the 6 th and 7 th floor, they are stepped at the 5 th floor and end beneath the balcony. To contrast the brick columns, painted metal panels are installed between each column that extend several feet below all the finished floors. The remaining exterior of the building is filled with glass windows. To finish out the building and hide the mechanical systems screen walls are installed around the roof top units. The screen walls are made up of painted corrugated panels that are attached to a steel tube frame. Overall, the use of different building material adds a unique look to the building. The building enclosure system consists of three major wall assemblies. First is the glazing system, which is made up of a 7-inch painted aluminum frame that is infilled with low-e 3

4 glass to help with the energy losses and gains of the building. Above and below each section of the glass system are insulated metal spandrel panels at each floor. The final system is the brick column section of the building. Behind each brick column is 5/8 sheathing that is covered by building wrap. The sheathing is supported by 6 metal studs that have batt insulation between them. Next is the structural steel column that is then surrounded by 5/8 gypsum board mounted on 3 5/8 metal studs. At each floor a steel angle is installed to support the brick. To prevent water damage, flashing and weep holes are installed to allow the moisture to flow out from behind the wall. All these systems are integrated together to form the entire building enclosure. The entire building s loads are transferred to the ground by a concrete foundation and steel superstructure. The loads are transferred from the foundation to the ground by strip footing around the perimeter of the building and spread footings under each column. The basement walls are a combination of masonry and concrete. On top of the foundation are wide flange steel columns. Each floor system is made up of steel beams, covered by metal deck shear studs and light-weight concrete to form composite beams. The lateral restraint system comes from four braced bays in the center core of the building: two braced frames in the east/west direction and two in the north/south that span the full height of the building. This allows the floor system to be designed for only the gravity loads making the design much easier. The mechanical system for 250 West Street is a combination of variable and constant air volume systems. Each floor is equipped with four VAV boxes that are equipped with 12 kw reheat coils, with the exception of the bathrooms. Each bathroom is controlled by a constant volume fan box for its air conditioning needs. On top of the building will be (2) 130 ton, (1) 75 ton and (1) 60 ton roof top units to condition the air. Along with the roof top units, a 122 ton cooling tower and several auxiliary electric heating coils will complete the major components of 4

5 the system. In order to get fresh air into the building; intake ducts will be located on the roof with the units as well as on the first and fourth floor. Several fans will be installed to help circulate air, exhaust fumes and to pressurize the stairs. Also, a carbon monoxide controlled exhaust system will be installed in the parking area to prevent the build-up of harmful gases. The electrical system for the building is shared with the other buildings on the block. This includes buildings B, C, D, the cinema, the parking garage as well as the multi-use project. To support all the electrical needs for these buildings a 480/277 volt, 2500 amp, 3 phase system is utilized. Buildings D, B & C and the cinema have 225 amp, 3 phase panels while the parking garage has a 100 amp panel. The remaining capacity of the system is used to run the multi-use project. Each floor is served by a 480/277 volt, 3 phase, 200 amp and 400 amp panel. Off of the 400 amp panel is a transformer that steps the voltage down to 208/120 and serves 2 panels. Having multiple voltages at each floor allows the lighting to be run at 277 volts in order to conserve energy and then step it down to 120 for receptacles. Each elevator and roof top unit is served by a 480 volt, 100 amp, 3 phase line. The lighting plan for the building is incomplete due to the fact that much of the space is currently being built as unfinished office space until tenants can be lined up. However, the public areas of the building have been finalized and have permanent lighting. The central corridor on the first floor of the building is lit by recessed cans, wall sconces and cove lighting. The recessed, low voltage cans provide the general lighting for the corridor and use a 12 volt lamp. The oval lobby area is accented with a cove rope light and wall sconces in addition to the low voltage general lighting. In the public spaces around the elevators and in the bathrooms, recessed fluorescent can lights are used. The basement lighting has also been finalized. The storage area and corridor will receive surface mounted fluorescent fixtures and metal halide 5

6 pendent fixtures will be placed in the parking area. For the most part, this is the only permanent lighting to be installed in the building at this time. There are some temporary 1-lamp fluorescent strips in the unfinished spaces to provide a minimum lighting level for safety purposes. The exterior of the building is lit by metal halide wall mounted cylinders at each column. The exterior columns on the front of the building cascade light both up and down accenting the columns. The cylinders on the middle columns only shine light down because of the covered entrance. Just like the rest of the building, the final lighting plan will be completed after tenants are locked in to the spaces. The main fire protection system in the building is a sprinkler system. The building is fully sprinklered in accordance with NFPA pamphlet #13. The sprinkler system is divided into 9 zones that have a control valve at each floor off the standpipes. Zone 0-A is a wet pipe system and covers the storage area in the basement while zone 0-B is a dry pipe system that protects the parking area. Zone 0-B is a dry pipe system to prevent water from freezing in the pipes and is a common type of system in unconditioned spaces. The rest of the building is covered under zones 1-7 which coincide with the floor numbers. To provide the system with water, two standpipes are furnished inside the core of the building that reflects the requirements in NFPA pamphlet #14. A six inch diameter pipe is to be located in the southwest corner of the core with an exterior fire hose hook-up on the west side of the building. Next to the six inch pipe is a drain pipe allowing the system to be drained for maintenance. In addition to the two pipes previously mentioned, there is yet another standpipe in the northeast corner of the core which is four inches in diameter. Along with the sprinkler system, there will be several fire-rated assemblies to retard the spread of fire. For example, the floor assembly, complete with fire dampers in the mechanical ducts, is rated at 1 ½ hours and the wall separating the central core is rated at 2 6

7 hours. Together, the sprinkler system and fire rated floor and wall assemblies make up the fire protecting system. The project located on 250 West Street was designed to be a multi-use building in Columbus, OH. Most of the building is unfinished space designed for office use, with additional space for retail, parking and storage. The exterior facade of the building consists of brick columns, metal panels and glass walls that enclose the structural, mechanical, electrical, communication and fire protections systems, to name a few. Developing an unfinished building forces the designers to have good communication with the developer in order to make sure the systems are sufficient for whom he intends to lease the space. Overall, the design team accomplished what the developer asked and the project is currently under construction. 7