Saloni choudhary 0838_zaragoza bridge pavillion

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ZARAGOZA BRIDGE PAVILION What it has principally in its favor is a wonderful landscape setting, to which the bridge proves responsive in a number of ways. For one thing, it curves in plan, gently resolving the divergent geometries of the north and south banks. In order to keep it above flood level, it extends far beyond the river’s edge on both sides. Massive embankments serve to anchor — both structurally and visually — either end in the ground.

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Transcript of Saloni choudhary 0838_zaragoza bridge pavillion

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ZARAGOZA BRIDGE PAVILION

What it has principally in its favor is a wonderful landscape setting, to which the bridge proves responsive in a number of ways. For one thing, it curves in plan, gently resolving the divergent geometries of the north and south banks. In order to keep it above flood level, it extends far beyond the river’s edge on both sides. Massive embankments serve to anchor — both structurally and visually — either end in the ground.

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The structure is not, however, a single span. A third point of support is provided by a small island two thirds of the way along the bridge’s length. The island’s eccentric location invests the structure with an asymmetry that Hadid — if not her engineer — has clearly relished.

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Zaragoza Expo 2008 is dedicated to water and sustainable development.

The basic module from which the whole structure has been derived is a triangular steel frame. It is repeated at 3.6m intervals along the bridge’s length, and adjusted in height and width with each iteration. What emerges through this procedure is an arched truss which is then lined out to become a spatial enclosure.

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The pods are stacked according to precise criteria – aimed at reducing the section of the bridge as much as possible where the span is longer (approximately 185m from the island in the middle of the river to the right bank), and enlarging it where the span is shorter (85m from the island to the Expo riverbank). One long pod spans from the right riverbank to the island, where the other three are grafted into it, spanning from island to left bank.

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ZARAGOZA BRIDGE PAVILION [ZARAGOZA, SPAIN]The Zaragoza Bridge Pavilion is organized around 4 main objects, or “pods” that perform both as structural elements and as spatial enclosures. The Bridge Pavilion design stems from the detailed examination and research into the potential of a diamond shaped section – which offers both structural and programming properties. As in the case of space-frame structures, a diamond section represents a rational way if distributing forces along a surface.

Underneath the floor plate, a resulting triangular pocket space can be used to run utilities. Floors inside each pod are located at the Expo principal levels: +201.5m (the soffit of the bridge is at +200m, flood protection minimum level of the Ebro River at the location of the Bridge Pavilion) +203m, +206m and +207.5m for the upper level.

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The diamond section has also been extruded along a slightly curved path. The extrusion of this rhombus section along different paths has generated the four separate ‘pods’ of the Bridge Pavilion. The stacking and interlocking of these truss elements (the ‘pods’), satisfies two specific criteria: optimizing the structural system, and allowing for a natural differentiation of the interiors, where each pod corresponds to a specific exhibition

space.

By intersecting the trusses/pods, they brace each other and loads are distributed across the four trusses instead of a singular main element, resulting in a reduction in size of load-bearing members.

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Spatial concern is one of the main drivers of this project. Each zone within the building has its own spatial identity; their nature varies from complete interior spaces focused on the exhibition, to open spaces with strong visual connections to the Ebro river and the Expo.Natural surfaces have been investigated when designing the Pavilion’s exterior surfaces. Shark scales are fascinating paradigms both for their visual appearance and for their performance. Their pattern can easily wrap around complex curvatures with a simple system of rectilinear ridges. For the Bridge Pavilion, this proves to be functional, visually appealing and economically convenient.The building’s envelope plays an essential role in defining its relation to the surrounding environment and atmospheric variations. The project has been designed to allow its interior to be thoroughly enlivened by the effect of atmospheric agents, such as the Tramontana wind blowing along the Ebro and, the strength of Zaragoza’s sunshine.During the Expo, a single weathering layer will enclose the building to protect it from rain. This Shark scale skin will be generated by a complex pattern of simple overlappingshingles. Some shingles can rotate around a pivot, allowing for temporary opening or closing of part of the façade. The pattern of shingles overlapping each other gives the Bridge Pavilion the widest variety of natural light via several degrees of aperture sizes: from rays piercing through tiny apertures – to wide, full size openings. Large apertures are located on the lower level, in correspondence with either end of the bridge, allowing for the greatest degree of visual contact with the river and the Expo.

This interlocking of the pods has given the design many exciting possibilities. Interiors become complex spaces, where visitors move from pod to pod though small in-between spaces that act as filters – or buffer zones. These zones diffuse the sound and visual experience from one exhibition space to the next, allowing for a clearer understanding of the installation content within each pod. The identity of each pod remains thoroughly readable inside the pavilion, almost performing as a three-dimensional orientation device.

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•The bridge comprises four such trusses. Two are laid end to end, forming the public route. The other two are rammed in from either side and serve as exhibition halls. The plan that results is trident-like, the handle bearing on the south bank, the forks pointing north.•Early on in the project’s development, the design team considered the possibility of an engineering solution based on a series of shell structures. This was ultimately rejected because the architect felt that such a monolithic structure would give the project the presence of a piece of heavy engineering. What Hadid wanted was a finer, more building-like scale. The bridge’s external image is very largely, therefore, a matter of cladding.•The lower level has been faced in premoulded steel panels, giving it a sinuous, aerofoil profile. Above, we are presented with a skin of mosaic-like glass-reinforced concrete panels. Comprising a series of interlocking triangles, this treatment is built up of ten different cutting patterns, each of which is assigned a distinct tone, graduating from black to white.

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