Safety first as developer executes concrete plan.Taking the lead among New York City New York City: see New York, city.
New York City
City (pop., 2000: 8,008,278), southeastern New York, at the mouth of the Hudson River. The largest city in the U.S. high-rise office building owner and developer, Dr. Axel Stawski of Kipp/Stawski Group has elected to emphasize SAFETY in his new 28-story office building designed by renowned architects Kohn Pedersen Fox Kohn Pedersen Fox Associates (also known by the acronym KPF)is a leading international architectural design firm located in New York City providing urban design and master planning for public authorities and private companies. Associates, PC.
The structure at 505 Fifth Avenue is being constructed with a concrete core and a flat plate reinforced concrete reinforced concrete
Concrete in which steel is embedded in such a manner that the two materials act together in resisting forces. The reinforcing steel—rods, bars, or mesh—absorbs the tensile, shear, and sometimes the compressive stresses in a concrete framing system.
Cast-in-place reinforced concrete was chosen over steel for this office building because it is terror-resistant, blast resistant, fire-resistant and sound-proof.
The concrete columns used at 505 Fifth Avenue are spaced 30-feet-on-center and they support an 11-inch-deep concrete slab Concrete slab
A shallow, reinforced-concrete structural member that is very wide compared with depth. Spanning between beams, girders, or columns, slabs are used for floors, roofs, and bridge decks. with 22-inch-deep capitals at the columns.
The 11-inch slab at the spandrel spandrel
Roughly triangular area on either side of an arch, bounded by a line running horizontally through its apex, a line rising vertically from the springing of the arch, and the exterior curve of the arch. meets the stringent architectural requirements for the curtain wall curtain wall
Nonbearing wall of glass, metal, or masonry attached to a building's exterior structural frame. After World War II, low energy costs gave impetus to the concept of the tall building as a glass prism, an idea originally put forth by Le Corbusier and Ludwig Mies design while still allowing impressive 15-foot dual cantilevers at the south-west corner.
The new 300,000-square-foot structure, which will contain approximately 275,000 square feet of office space and 25,000 square feet of retail space, will also contain a 12-inch-thick concrete shear wall shear wall
In building construction, a rigid vertical diaphragm capable of transferring lateral forces from exterior walls, floors, and roofs to the ground foundation in a direction parallel to their planes. Examples are the reinforced-concrete wall or vertical truss. that will completely encase en·case
tr.v. en·cased, en·cas·ing, en·cas·es
To enclose in or as if in a case.
en·casement n. the fire stairs above the building's mezzanine floor Noun 1. mezzanine floor - intermediate floor just above the ground floor
storey, floor, story, level - a structure consisting of a room or set of rooms at a single position along a vertical scale; "what level is the office on?" .
The shear wall will be located at the rear of the property to maximize rentable space with views on 42nd Street and Fifth Avenue. Any eccentricity in the lateral load resistance system is handled by the reinforced concrete slab-frame system.
An additional safety measure being taken by the owner is to have the office building's ground floor perimeter columns jacketed in a steel plate to maximize the building's structural integrity against explosive loads. In the event of local overloading and failure of a slab-column connection, sufficient steel is provided to arrest progressive collapse.
The owner is going one step further to ensure safety by having an 8-inch reinforced concrete curb at the first floor as a barrier against vehicle intrusion.
The use of a concrete hardened core and cast-in-place reinforced concrete framing system also increases the clear ceiling heights and/or lowers the floor-to-floor heights allowing for less electrical wiring Electrical wiring in general refers to insulated conductors used to carry electricity, and associated devices. This article describes general aspects of electrical wiring as used to provide power in buildings and structures, commonly referred to as building wiring. , ducts, piping and building skin.
At the lower levels where the owner anticipates the possibility of interconnected floors, provision has been made for tenants' future stairs.
Supporting the owner's decision to construct a high-rise office structure using a concrete core and high-strength concrete is research by the National Institute of Standards and Testing that steel, when exposed to fire, loses its strength and stiffness much quicker than high-strength concrete. High-strength concrete, which has a lower thermal conductivity, will maintain its strength and stiffness much longer. This means that in the event of natural or unnatural disasters, tenants will have more time to evacuate the building should evacuation become necessary.
In addition to safety, the mass of a concrete structure such as this makes it a significant thermal reservoir with the ability to store larger amounts of energy. In the heating months, concrete walls and floors absorb the interior heat during the day, and then radiate ra·di·ate
1. To spread out in all directions from a center.
2. To emit or be emitted as radiation.
ra warmth back into the space at night. The same holds true for cooling. This thermal inertia allows concrete to help maintain a relatively steady interior temperature.
By storing and releasing energy needed for heating and cooling, concrete delivers year-round energy benefits.
Furthermore, "concrete is a durable material that gains strength over time. Such an extended life span conserves resources by reducing maintenance and the need for reconstruction," explained Alfred G. Gerosa, president of the Concrete Alliance, Inc.
"A cast-in-place reinforced concrete high-rise office building such as 505 Fifth Avenue enhances homeland security by ensuring a safer place to work. The Concrete Alliance salutes Dr. Stawski for putting the safety of New Yorkers first and foremost. The example they have set will serve as a precedent to all owners and developers planning to construct high-rise office structures in New York City," Gerosa added.