0-14 Tower

source: plataformaarquitecturacl

La Torre O – 14, ubicada en Dubai, se diseñó en el 2007 y su construcción acaba de terminar. Diseñado por Jesse Reiser y Nanoko Umemoto, el edificio cuenta con una llamativa fachada – celosía que ayuda a controlar el ingreso de calor solar al interior, además de contar con un sofisticado sistema de refrigeración pasiva que reduce el consumo de energía. Imágenes de la construcción y la descripción del proyecto a continuación.

Su estructura busca parecer más una escultura que un edificio, al mismo tiempo de funcionar en favor de la eficiencia del edificio; la fachada está diseñada con más de 1.000 recortes circulares que funcionan como un “exoesqueleto”. En el interior se dispuso un núcleo central que contiene espacio para oficinas.

Esta estructura perforada es compatible con el núcleo, y por lo tanto permite que los espacios interiores sean muy abiertos. Las áreas de oficinas están libre de columnas, entregándoles la capacidad de dividirse y subdividirse de la manera en que sus usuarios lo necesiten.

El espacio intermedio entre el exoesqueleto y el núcleo también actúa como un conducto de aire caliente, ya que Dubai es esencialmente una ciudad en medio del desierto.

Este exoesqueleto no sólo protege al núcleo del sol, su forma logra llevar el aire caliente hacia arriba y hacia afuera, lo que permite un importante ahorro energético en el enfriamiento del interior. Además, los agujeros circulares se ajustaron cuidadosamente para proporcionar puntos de vista hacia la ciudad yel desierto.

Con 21 pisos, el edificio contiene principalmente oficinas, pero en su nivel de suelo se dispuso un centro comercial y un acceso vinculado a una explanada frente al mar.
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source: reiser-umemoto

Project Description
O-14 stands at the heart of business bay. The tower’s concrete shell not only is the structure of the building but also creates a lace-like façade open to light, air, and views. 21 stories of custom-designed office floors are carried without the barriers of conventional columns and walls. At ground level, exclusive shops link this site to Business Bay’s waterfront esplanade combining high-end shopping eminent culture and popular entertainment. Below grade, four levels of parking provide capacity for over 400 cars.

The openings on the shell are modulated depending on structural requirements, views, sun exposure, and luminosity. A space nearly one meter deep between the shell and the main enclosure creates a so-called “chimney effect,” a phenomenon whereby hot air has room to rise and effectively cools the surface of the glass windows behind the perforated shell. This passive solar technique essentially contributes to a natural component to the cooling system for O-14, thus reducing energy consumption and costs, just one of many innovative aspects of the building’s design.
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source: archrecordconstruction

The showy skyscrapers that established Dubai’s identity in this hot, humid, desert site on the Persian Gulf have been overshadowed by the towering Burj Khalifa. Yet one short office building — a mere 22 stories— holds its own against Skidmore Owings & Merrill’s 2,717-foot-high glass-and-steel behemoth. The diminutive office tower (347 feet high), designed by New York architects Reiser + Umemoto, stalwartly rises from a white, sandy lot in this instant city in the United Arab Emirates. It makes its mark by original means: with a holey, curvaceous outer shell.

Called 0-14 after the site number of the Business Bay district, the slim structure’s dominant feature is a poured-concrete exoskeleton gouged with 1,326 blobby holes in five sizes. The architects intentionally sought to create an alien presence in the melange of banal towers. “We embraced the radically abstract terrain of nowhere and its artificiality,” says Jesse Reiser.

The ghostly white exoskeleton stands 3 feet away from an inner glass-walled enclosure that follows its swerving contours: The two are linked by structural concrete tongues. With a central stair and elevator core, the interiors are column-free, allowing each floor to provide 6,000 square feet (net) of office space to its tenants.

Jesse Reiser and Nanako Umemoto, best known for winning international architectural competitions, got this commission unexpectedly in 2005. They had entered a competition for another site in the Business Bay district, held by Dubai Properties. While they lost the project to Zaha Hadid (still unrealized), their scheme piqued the interest of one of the developers, Shahab Lutfi, who was about to open his own office. By coincidence Lutfi was working with a Dubai architect, Khalid Alnajjar, who had studied under Reiser at Columbia University’s architecture school, and highly recommended the team.

In an early version, the architects conceived the 0-14 building as an amorphous shape with glazed apertures. But the problems of placing gaskets around the glass and connecting the shaft to the concrete floors convinced the firm to develop a double-layered structure. By separating a concrete exoskeleton from a glazed concrete deck and core tower by 3 or more feet, the architects found the residual space would create a stack effect that takes hot air out of the building. Furthermore, the solar protection afforded by the curvilinear outer cylinder reduced cooling expenses by about 30 percent. Since the glass is shielded, it didn’t need to be high-performance, although the team specified tinted glazing that would appear to recede farther behind the facade.

The master plan for Business Bay calls for towers on a podium that contain parking, with street-level arcades linking to retail shops and building lobbies. Reiser + Umemoto convinced the developer to place parking underground on this 34,000-square-foot site and have a two-story elevated podium wrap the tower on three sides to accommodate more office space and a restaurant. The revision meant the front facade could still be read as monolithic and scaleless, while elevating the podium allows pedestrians access to a plaza at the back overlooking the bay. A truss spans the rear of the podium to keep the ground less cluttered by columns, and bridges on two levels link the podium to the tower.

Since the exoskeleton would offer lateral resistance to wind, the architects and engineers found that the elevator core and the concrete shell could be lighter than normal. The shell, which Reiser refers to as “atectonic,” lacks any break in its surface, including expansion joints. But the hole-ridden, contoured slipcover of concrete required a dense basket weave of rebar — its underlying “structural tectonic,” in Reiser’s words. The team tied the rebar at intersections with stirrups in the zones of high stress, creating a diagrid with 40 percent openness.

The concrete pour offered its own challenges since the subcontractors ignored the architects’ 3-D modeling of the formwork for the holes. Their own methods turned out to be OK, says Reiser, but some deformation of the foam forms in the holes at the bottom required wrapping them with melamine laminate.

Inside the 398,655-square-foot tower, occupants are protected from the high heat and gusts of sandy wind, while they still have expansive views out. In some respects the design could provide an influential prototype for other desert buildings. It comes as no surprise that the sculptural solution was expensive to build. Although the design saves in cooling costs, the up-front investment, withheld by the developer, was higher than a conventional structure, Reiser notes. Like many high-rise buildings erected in far-flung places, the willingness of clients, particularly before the economic free fall of 2008, has encouraged a liberty to experiment that could provide technical and sustainable lessons for the next building boom. Whenever that comes.
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source: archplatformaru

В Дубаи завершено строительство небоскреба О-14 по проекту студии Reiser+Umemoto. Конструкция интересна, прежде всего, своей несущей внешней стеной – она максимально облегчает сердечник здания.
22-этажного офисное здание установлено на двухуровневый подиум. Внешняя стена башни выполнена из бетона: этот “панцирь” задает структуру здания и служит опорой для перекрытий. Внешняя стена является независимой несущей конструкцией, которая принимает на себя силовую нагрузку. Благодаря этому внутреннее пространство максимально открыто. Перекрытия, опирающиеся на периметр здания, могут быть тоньше, чем в классическом небоскребе. Это значительно расширяет возможности внутренней планировки. Поскольку силовая структура внешней стены имеет диагональную конструкцию, это позволило свободно разместить по всему периметру декоративные ромбовидные проемы. Общая площадь постройки – 300,000 кв.м., начало строительства — 2006 г.
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source: archilisawordpress

O14 est une tour commerciale haute de 22 étages perché sur un podium à deux étages. Les travaux ont débuté en Février 2007, et comprend plus de 300,000m² d’espace de bureau pour la baie d’affaires de Dubaï. O-14 est situé dans le prolongement de la crique de Dubaï, qui occupe un endroit bien en vue sur l’esplanade du secteur riverain. O14 est gainé dans une coque en béton de 40 cm d’épaisseur perforé par plus de 1300 ouvertures qui créent un effet de dentelle sur la façade du bâtiment.

La chape de béton du O14 fournit une peau structurelle efficace qui libère l’âme de la charge des forces latérales.

La peau est non seulement la structure du bâtiment, mais elle agit aussi comme un écran solaire ouvert à la lumière, l’air, et les vues. Les ouvertures sur la peau sont modulées en fonction des besoins structurels, des vues, l’exposition au soleil, et la luminosité.

Un espace de près d’un mètre de profondeur entre la peau et l’enceinte principale crée un « effet cheminée« , un phénomène par lequel l’air chaud d’une salle se leve et se refroidit efficacement la surface des vitres derrière la coque perforée. Cette technique solaire passive contribue essentiellement à une composante naturelle du système de refroidissement pour O14, réduisant ainsi la consommation d’énergie et les coûts, l’un des nombreux aspects innovants de la conception du bâtiment.