2016年普利普利兹克奖得主｜亚力杭德罗·阿拉维纳｜概念设计

2016年普利普利兹克奖得主

Alejandro Aravena

亚力杭德罗·阿拉维纳｜智利

Tehran Stock Exchange Competition, 1st Prize: Alejandro Aravena Architects & VAV Studio

Exterior South ? Alejandro Aravena Architects

During the last few years the world has witnessed dramatic changes. Our world is no longer rural, economic models are struggling, and the centres of innovation and political power have shifted.

It is this context that explains why the recently held competition for the

new Tehran Stock Exchange is relevant beyond the building. The Physical Development Research Center organized a competition between 29 top architecture firms, later narrowed down to eight after a RFQ process, who each worked with a local Iranian firm. In a country experiencing a very unique economic moment, the brief of the competition aimed to challenge the typology of the

stock exchange in general, as well as factors that could alter this type to address cultural factors specific to its location. Thus, the firms were asked to look at how this program has developed throughout history while also undertaking a thorough analysis of the specifities of this project.

The jury was composed by local architects Mehdi Alizadeh, Farhad Ahmadi, Bahram Shirdel, Hossein Sheikh–Zeineddin and Nader Tehrani (MIT Head of Architecture, principal at NADAAA) as spokesperson.

Alejandro Aravena (founder of Alejandro Aravena Architects, Executive Director

of ELEMENTAL) together with local office VAV Studio were selected as the winners for their artful, considered, and minimal, project; of the various proposals, it was the only project which took into consideration functions and forces, geometry and geography, and an organization that distributed its program in a field condition, evenly spreading its function to best capture, light, views, cross ventilation, as well as shade. In turn, it produces a timeless (yet fast-paced) character of the stock exchange as an institution, a building that extends broader traditions while mirroring the current state of its country.

Aravena’s entry stood out from the rest as it was conceptually distinct, aligned with the brief of the competition. Other highlights of this entry are its geometry, structural base, sensitivity to climate, and relation to its mountainous landscape, which are explained further in the architect’s description below:

A monolithic figure at a first glance, the building achieves a particular transparency thanks to the hollow blocks used on its skin, turning into a lamp that is transparent to the public.

The decision of the jury, while unanimous, is only a recommendation to the client, so we will keep you informed as the project moves forward.

Read the complete architect’s description, with renders and drawings, after the break:

What informs the form of the Teheran Stock Exchange?

Bookmark this picture!

Exterior North East ? Alejandro Aravena Architects

Why does our proposal have this design and not other?

Every building is shaped according to a set of questions and the consequent answers that it gives. Some of the questions are given (by the client, by the place, by the budget, by the legal constraints, etc) and others are raised by the professionals involved in the proposal. So, if a project is an equation, the result depends as much on how the terms were identified as from the way one chooses to solve and synthesize them.

Let’s start by identifying the terms of the equation from the more concrete and objective to the more abstract and open to interpretation.

Functions and Forces

Bookmark this picture!

Sketches ? Alejandro Aravena Architects

The first thing that wanted to respond to, was the program, the use and the set of functions that had to be accommodated in the building. Our first decision was to place the more public part s of the program in lower levels so that access could take place in a fluid smooth way. Stock Exchange Hall and Auditorium were placed close to the access of the building, on the south side of the lot. From this same front we propose the access the Bank Representatives, the Training Classes, the Museum and the Tea House, forming a kind of Public Plinth for the whole building.

This operation, which may seem obvious, has to solve 2 problems that are not evident. The first one is that despite their public condition, these programs have to respond also to a force that pulls almost in a contrary direction: Security. The way we propose to conceal public and massive use with security procedures is by organizing the sequence of access around a series of introverted voids (halls) that are open to the light above.

Bookmark this picture!

Sketches ? Alejandro Aravena Architects

The second difficulty is that of making space for such bigger volumes of air with subsequent bigger spans under typical office floor plans that have a more conventional span. In a seismic context that has to respond to horizontal loads as well as to the gravity force such an operation may weaken the structure. Our proposal is to introduce a wall structure in the perimeter the complex able to take the loads transferred to them by the triangular grid slab at the upper level of this public base. The resulting opaqueness of the landing of the building is then coincident with the need for security described previously.

Bookmark this picture!

Sketches ? Alejandro Aravena Architects

Bookmark this picture!

Sketches ? Alejandro Aravena Architects

Walls on the perimeter of the building take the vertical gravity forces; arches reflect that compression is the main force in play on the edges of the building. For responding to the horizontal loads, walls on the perimeter have a slight slope so they brace seismic accelerations. We also introduced a triangular grid in plan; this way the floor geometry dissipates the seismic forces in a field instead of structure lines.

Bookmark this picture!

Exterior detail ? Alejandro Aravena Architects

For the offices’ access we distinguished two fronts: for the Stock Exchange and management offices we used the access and square on the south side. For accessing the independent offices we propose the north alley that given the slope of the site, allows still for continuity with the street level.

Independent offices are placed in 2nd and 3rd floor; by concentrating them in these 2 lower levels, we can stop their own vertical circulation system from the 4th floor up, allowing for a more efficient ratio between serving and served spaces for the rest of the Stock Exchange offices.

Bookmark this picture!

Section 1 ? Alejandro Aravena Architects

Geometry and Geography

The way the Place influenced the form of our proposal may be understood from 2 different starting points. On one hand is the lot with its allowed occupancy at each level and on the other hand the achievement of the right working environment for Teheran’s weather.

Given the amount of square meters that had to be allocated, the compact proportion of the lot and the allowed occupancy (80% for first basement, 70% for ground floor and 50% for upper levels), whenever we tried to solve the project in one single volume, the result was invariably very deep plans with low quality working spaces. We were looking instead for as much direct contact as possible for each working space with natural light, natural ventilation and views. Besides that, given the height limitation, the silhouette was not vertical, nor horizontal, but a kind of chubby form that missed a vertical proportion that we thought was important for the Stock Exchange’s urban presence.

If we tried to split the program into several towers, the problem of the deep plan was solved, but it was very inefficient in terms of use (multiplication of vertical circulation systems) and also lost a sense of unity that we felt the institutional character required.

Bookmark this picture!

Sketches

So our proposal was to explore a pattern that expanded through the site in many directions with a typical floor plan that maximized the perimeter so that more square meters were in contact with the surroundings. In order to achieve a maximized perimeter, we articulated the footprint of the building with geometry able to unfold alternatively around open courtyards or facing the city in different directions. Given the pattern is always open, the resulting volume is composed by vertical elements and yet is still perceived as a unity. It is simultaneously one volume and many volumes proving a richness in the urban reading.

We defined built bays wide enough for efficient use but narrow enough for easy cross ventilation and natural light access for each piece of the program. The typology of a matt-building extruded in height, where interior and outdoor are woven around each other was the natural strategy to increment the contact between the two. The hexagonal grid allows for reducing circulation close to the