Saturday, 25 June 2011

Curved glass contributes with the facades of the future

Structural glass symbolizes modern architecture and it is considered an added value to achieve all glass facade and non-metal supported transparent structures.

The prospect of shapping glass has contributed to attain a broad variety of aesthetical and structural options through oversized pieces of glass with complex geometries. Its versatility has allowed to achieve a better integration between the aesthetic and functional objectives.

The Casa da Musica in Porto (Rem Koolhas, 2004) is an example how to make the best of curved glass, because glass develops both functions: structure and enclosure. The glass shape increases the set stiffness and any metallic frame is required. The curved glass pane is mechanically supported at the bottom and at the top, without any other support along the 6 meters in height of the vision area.

Casa da Musica in Porto (Rem Koolhas, 2004)
 
Casa da Musica in Porto (Rem Koolhas, 2004)
 
In glass bending technology, one distinguishes between hot-bending and cold-bending. Hot-bending consists on bending glass at high temperatures, being the most common manufacture method. On the other hand, cold bending can be done in two modes: bending during the assembly at the construction site or laminated bends are done in factory. In both cases, the glass are brought to the desired shape by means of external contact pressure.

In order to achieve a double-curved, spherical, curves with small radius or complex geometries, high temperatures are required during the fabrication process.

This post is under construction. In fact, it will be under construction during a long time. Creativity  is the limit, because curved glass contributes with the facades of the future.




Saturday, 21 May 2011

Apple Store in Shanghai and how to make the most of membrane stresses (Bohlin Cywinski Jackson Architects, 2010)

The author of the Blog in front of the Apple Store in Shanghai

Apple Store in Shanghai contributes to the design of buildings considered icons of structural glass achievement today. The store, inagurated last July 2010, is located in the Pudong financial district, situated between the Oriental Pearl Tower and the Shanghai World Financial Center, one of the tallest skycrapers worldwide.

The authors of the design are Bohlin Cywinski Jackson Architects, a prominent american architecture studio, who already designed another Apple stores, such as those in New York and in London.

The glass cilindrical envelope is formed by tempered curved glass panes of 12 meters in height. The design achieves the best integration between aesthetic and functionality through its structural system, because structure and envelope are formed by glass.

The facade resists wind loads through acting all the glass panes together as a shell. This is achieved through the stainless steel conectors that link all the glass panes together. This structural system develops less stress in each glass pane, decreasing the glass thickness accordingly and making the design happen.

The glass panes are supported by a glass laminated fins, forming a frame with the glass roof beams that support the top of the cylinder.

In order to obtain a 12 meters curved tempered glass, an customised oven was built for this project to manufacture the largest pieces of curved tempered glass.

Through this design and materials, Apple communicate perfection, innovation and passion for being the best.

Internal view of the glass roof of the Apple Store in Shanghai

Apple Store in Shanghai



Tuesday, 26 April 2011

Façade Engineer´s skills and roles


A façade engineers should have many skills. They have to be creative and practical, having a broad knowledge about design, calculations, tests, materials, standards, installation on site, planning and costs.


The list as follows shows the main skills for a façade engineer :

  • Be able to imagine every component of façade, such as anchorage, structure, fillings and final elements. It is essential to be able to construct the whole façade in your mind before doing any sketch.
  • Every design should be feasible to be installed on site. It does´t make any sense design something if it is not possible to be assembled in a construction site.
  • A general understanding of the concepts in relation to energy consumption, light performances,f ire requirements, thermal insulation and acoustics. 
  • Sketching is essential as a way of efficient communication between engineer and architect.
  • Be capable to understand the methodology of how to calculate a bracket, the inertia of any material section and supported beams.
  • An engineer should provide the best technical solution at the optimal cost. You can not design something if you don’t know how much does it cost.
  • Good communication skills.


Facade engineers should get used to be on a site. The construction site is where the practical approach makes the most of the technical skills.
An interesting interview published in The Independent a years ago to John Champion, a façade engineer and technical director of James&Taylor firm, he explains his views about this important role in construction.

What does a façade engineer do?

I work with architects and builders to create the façade, or outer skin, of a building. Most buildings have a steel or concrete frame, plus a weatherproof layer on top. The very outer bit of that weatherproof layer – the bit that looks good – is the façade. The nice thing about my job is that I get to influence its design, form, and appearance. If an architect has an off-the-wall idea, but doesn't know how to turn it into reality, we get called in.

What's your working pattern like?

Theoretically, the hours are 9.30am to 5.30pm. But because of deadlines, we usually work much longer. A typical project might start with a meeting with the architects and client to look at various models and drawings. After whittling down various proposals, we mock them up, ending up with one or two versions. The next stage is critical: we construct a large-scale prototype, two or three storeys high, so everyone can stand back and get a perspective of what it might look like from 100m away. It either works, or it doesn't. Then it's a question of logistics – ordering materials, producing drawings for builders and overseeing construction on-site.

What do you love about it?

My favourite thing is playing a part in creating something that looks terrific. I worked on the futuristic Selfridges in Birmingham, and the New Museum of Contemporary Art in New York, which looks like a huge pile of boxes balanced on top of each other. You can stand back on a street corner, look up at an iconic 23-storey building that started as a scribble on an architect's piece of paper and think, "I did that".

What's not so greatabout it?

Dealing with people who don't care. Sometimes you get involved in projects that aren't overtly well-designed, and end up working with a team that doesn't care what the building looks like – they just want it to work. We want it to work and look terrific too. If everything was simply built to the lowest functional denominator, it would be pretty sad.

What skills do you need to do the job well?

You need to be a good engineer, to understand the principles of contemporary construction and be extremely thorough and practical. You can't design something if you don't know how to bolt it together yourself. If you're talking to a guy on a scaffold, he won't buy what you're saying if you haven't ever wielded a spanner, so it helps to have a solid background in construction. Being able to communicate well is important – you've got to be able to get your point across, whether you're talking to a room of 30 people, meeting an architect, or sitting down with a group of builders.

What advice would you give someone with their eye on your job?

The key thing is to choose the company you work with carefully – look at whether they do interesting work. Get into the technical and design department and show you're willing to roll your sleeves up and get stuck in. Ideally, you should try to get an engineering qualification and brush up your skills in computer-aided design. The days of the cigarette packet sketch are long gone, so you need to be pretty hot on computer skills. Companies look for people with an eye for good design and a fixation with all things mechanical – I used to spend hours making Meccano models as a child.

What's the salary and career path like?

Starting out in the technical department of most engineering and construction firms, you might earn about £30,000 a year. You could specialise in a particular area of construction, and work your way up through the management levels if that's what you're interested in.

Friday, 15 April 2011

Peter Rice (1935-1992)

The purpose of this post is to present Peter Rice, one of the most outstanding facade engineers ever. This great Irish engineer contributed in facades and structures disciplines with important innovations, through his involvement in projects considered icons of structures and façades nowadays.

He took on his professional career as Structural Engineer in Ove Arup  firm from 1956 to 1977, afterwards he founded his own engineering firm, partnering with Martin Francis and Ian Ritchie.

The following list is a summary of his vision:


  • He believed the best buildings are the result of a symbiotic relationship between the architect and the engineer, where the engineer is the objective inventor and the architect the creative input.
  • He was convinced that there was nothing mysterious about the process of innovation. He was never satisfied with mundane solutions. He took risks during the early stages of the design process.
  • He combined advanced structural analysis techniques with investigations of materials in order to achieve the best structural systems.
  • Peter confessed to learn just what he needed to know when he needed it.


According to Rice, the roles of the engineer are:


  • The use of the engineer’s understanding of materials and structure to make real the architectural designs.
  •  Innovation and support the creativity of architects.



Sydney Opera House (1973, Jorn Utzon)


Louvre Pyramid (Paris, 1988, Ming Pei)




Lloyd’s of London (London, 1986, Richard Rogers)



Stansted London Airport (1991)


Cité des Sciences at La Villette (Paris, 1987, Adrien Fainsilber)



The Centre Pompidou adopted the gerberette solution to achieve the long spans required to support a heavy library that could be moved anywhere in the building. One of Peter’s main contributions was his insistence on the use of cast steel for these pieces. The gerberette acted as a short beam propped on a circular column and tied down at the ened with a circular bar.

The curtain wall in the Cité des Sciences at La Villette has been the origin of the inexhaustible source of inspiration for the point-supported glass facades worlwide. The main innovations are set out as follows:

  • Drilled glass panels with countersunk holes for point fixings supports.
  • Spherical bearings keeps all loads in the glass plane and eliminate local bending effects.
  • Horizontal cable trusses resists out-of-plane wind forces.


In 1992 he was awarded the Royal Gold Metal for Architecture by the Royal Institute of British Architects for his achievements which let the advancement of architecture.

In 1994, the Harvard University established the Peter Rice Prize in recognition of the ideals and principles that he represented.

After his early death, architects and engineers lost an important source of inspiration and innovation, however, actual designs are still based upon his principles described on his books, as a legacy for the future generations.



An Engineer Imagines (Peter Rice)
Structural Glass (Peter Rice&Hugh Dutton)

Wednesday, 22 December 2010

Fire Insulation System Buryat EI 120

Rockwool insulation panels being installed onto the facade
When you have your own business, your boss is the most demanding one: The Market. Only if you offer competitive and innovative products, the market will award you. This is the case of Buryat ( htt://www.buryat.es ), a Catalan company located in Barcelona, which is specialized in rockwool fire insulation technical solutions integrated in curtain wall systems. They invest to improve their products according to the observation market needs. Their system aims to minimize the number of pieces and reduce the assembly operation on site.

All of their systems are proprietary, according to the European Standards.






The new version of Buryat EI120, as solution for 1 meter fringe between slab concrete and curtain wall, is formed by four elements described as follows:
 High density rockwool insulation panel of 50 mm thickness.
 Espiga ACR: bracket between panels.
 Square profile: anchorage for horizontal panel on the lower slab side.
 Angled: anchorage for vertical panel internal aluminium frame.

The system is formed by a rockwool vertical panel inside the aluminium frame, afterwards two horizontal panel situated one on the top and one on the lower side slab. The lower panel is anchoraged to the slab through the square profile. The top panel is fixed between the concrete slab and vertical panel.
The rockwool panels are anchoraged to the concrete slab, in order to achieve the independence between fire insulation system and curtain wall.

Finally, the aluminium mullions are covered with a new rockwool panel through the Espiga bracket, providing continuity all across the facade. At the top area, the same rockwool panel is fixed against the vertical panel through the espiga bracket.
The free spaces between the rockwool panels and the slab concrete must be filled with intumescent sealants.

The insulation fire system integrated in a curtain wall passed the test, achieving 120 minuts of stability and integrity against fire.

1st step of the sequence of installation

2nd step of the sequence of installation

3rd step of the sequence of installation

4th step of the sequence of installation


 

Tuesday, 26 October 2010

Torre Agbar (Barcelona; Jean Nouvel, 2005)

Torre Agbar night view



The Torre Agbar was designed by Jean Nouvel in assotiation with B720 architects. The building of 144 meters in height is located between Avinguda Diagonal and Carrer Badajoz, near la Plaça de les Glòries in Barcelona.

According to Jean Novel, the shape of the Torre Agbar was inspired by the mountains of Montserrat and the shape of a geyser rising into the air.


The Agbar Tower envelope is a double skin facade with a maintenance catwalk within.

The double skin presents an inner leaf formed by windows within a steel frame and the outer leaf is formed by glass louvres supported onto supporting steel frames.

The design makes easier the façade installation, because the spandrel metallic cladding and the glass louvres were assemblied from the maintenance catwalk. This improved the site safety conditions whereas supposed a cost saving in lifting devices.

The glass louvres supporting frame and the catwalk were installed from the scaffoldings. Afterwards, the  catwalk was employed as a platform for the glass louvres installation, later used as the vertical protection for the rest of the façade works. Finally, any maintenance work can be done from the catwalk, being safety and accessible for any façade component.

One of the outstanding elements of the building is the façade lightening system. The tower has more than 4,500 luminous LED devices operating independently that enables the generation of images on the  envelope of the tower. The system is capable of creating 16 million colors.

Agbar Tower has achieved to become one of the landmarks in Barcelona, which is very meritorious  as  being surrounded by the projects carried out by the greatest architect ever, Antoni Gaudí.


View of the Barcelona from the maintenance catwalk

Installation works taking place from the scaffolding


Installation of the glass louvres taking place from the maintenance catwalk

Sunday, 24 October 2010

Burj Khalifa: un ejemplo de aplicación de sellantes de silicona

El autor del blog durante su visita al Burj Khalifa
Resumen del artículo publicado en el Boletín Electrónico de la Construcción el pasado 11 de enero de 2010, sobre la aplicación de sellantes de silicona. El título del artículo es: Las siliconas de Dow Corning protegen la torre Burj Khalifa de las duras condiciones del desierto.

La torre Burj Khalifa, antes llamada Burj Dubai, se eleva 818 metros por encima del nivel del suelo y se ve desde cualquier punto en un radio de 95 km. En este edificio de 160 plantas se encuentran la mezquita más alta del mundo en el piso 158 y la piscina más alta del mundo en el piso 78.

El Burj Khalifa establece el récord de la instalación de fachada con materiales como aluminio, silicona y vidrio . La fachada está formada por más 24.000 paneles de revestimiento en una superficie total de muro cortina de 132.000 m2.

El material de revestimiento se elaboró de manera especial empleando técnicas avanzadas de ingeniería, incorporando vidrios de altas prestaciones energéticas, material de sellado de silicona y adhesivos estructurales, parteluces de aluminio y antepechos de acero texturado con aletas tubulares verticales de acero inoxidable.

Ron Fillmore, director ejecutivo global del sector de la construcción de Dow Corning explicaba: “Hemos participado en muchas de las construcciones de edificios famosos en todo el mundo durante más de 60 años, por medio del acristalamiento estructural de muro-cortina, el montaje y protección contra diferentes condiciones climáticas, el montaje de vidrio de aislamiento y el sellado interior. Esa experiencia previa junto con la eficacia probada de nuestra tecnología de siliconas, han tenido un papel crucial en este proyecto,”

El proyecto era único en todos los aspectos: el tamaño, la complejidad y la cooperación de una industria plurinacional. Las duras condiciones ambientales proporcionaron otro desafío único, dado que los materiales de construcción tienen que resistir la prueba del tiempo en el desierto.

“En Dow Corning estamos encantados con este tipo de desafíos. Se ajustan perfectamente a las propiedades de nuestras siliconas, que tienen una duración increíble y son ideales para condiciones ambientales adversas como ésas,” comentaba Jean-Paul Hautekeer, director de Marketing Global de proyectos de construcción. Las soluciones para la torre Burj Khalifa incluyeron los servicios de apoyo a proyectos globales de Dow Corning, de probada eficacia, que se comercializan actualmente como un programa integrado y totalmente dirigido al cliente llamado “Quality Bond”.

“El programa Dow Corning Quality Bond eleva la adhesión y sellado con silicona a un nuevo nivel, por medio de la introducción de un conjunto de servicios y compromisos, relevantes para todos los miembros de la cadena de especificación del proyecto de construcción. Ofrece eficacia garantizada y tranquilidad,” afirmaba Tim Efthimiady, director comercial del sector de la construcción en Europa y Oriente Medio. La torre Burj Khalifa ha sido la oportunidad ideal para ofrecer nuestro programa Quality Bond a las diferentes empresas ligadas al proyecto, desde el contratista de los vidrios y muro cortina hasta el contratista principal, arquitecto y consultor”.


Vista del Burj Khalifa y alrededores