• Abstract and Figures
• Public Full-text

Disponible en www.hormigonyacero.com 0439-5689 / Hormigón y Acero 2021; 72(294/295):85-97 https://doi.org/10.33586/hya.2021.3049 Membrane Substitution of La Cartuja Stadium Roof in Seville, Spain Sustitución de la membrana de la cubierta del estadio de La Cartuja de Sevilla, España Enrique Goberna Péreza , Knut Stockhusenb, Mike Schlaichc a Structural engineer. Director at schlaich bergermann partner, Spain b Structural engineer. Partner & Managing Director of schlaich bergermann partner c Prof. Dr. sc.techn. Partner & Managing Director of schlaich bergermann partner Recibido el 1 de diciembre de 2020; aceptado el 16 de abril de 2021 ABSTRACT After 20 years of use, the roof membrane of the Olympic Stadium of La Cartuja in Seville showed signs of aging. This produced a certain loss of pre-stressing of the membrane-cable system that, together with a more than probable mismatch between the dead loads assumed in the original design and the current ones, made that the rainwater runoff did not drain to the appropriate points under certain rain con- ditions with wind downward pressure load. In March 2018, torrential rains combined with westerly winds that, in light of events, were compatible with the circumstances that led to poor roof drainage that resulted in some water ponds on the membrane. The article describes the steps that were taken to solve the pathology. KEYWORDS: Large span roof, lightweight structures, membrane, pathology of structures, steel, cables. © 2021 Asociación Española de Ingeniería Estructural (ACHE). Published by Cinter Divulgación Técnica S.L. All rights reserved. RESUMEN Tras 20 años de servicio, la membrana de la cubierta del Estadio Olímpico de La Cartuja en Sevillla mostró signos claros de envejeci- miento, lo que se tradujo en una pérdida de pretensado del sistema estructural y por tanto de su rigidez. Esto, junto con un probable desajuste entre las cargas muertas asumidas en el diseño original y las actuales provocó que, bajo ciertas condiciones de lluvia y carga de viento de presión sobre la cubierta, las aguas de escorrentía no drenaran hacia los puntos adecuados. En marzo de 2018 unas lluvias torrenciales se combinaron con vientos del oeste que, a la vista de los acontecimientos, eran compati- bles con las circunstancias que provocaron un mal drenaje de la cubierta, lo cual dio lugar a estancamientos de agua en la membrana. El presente artículo describe los pasos que se dieron para solucionar la patología. PALABRAS CLAVE: Cubiertas de gran luz, estructuras ligeras, membrana, patología de estructuras, acero, cables. © 2021 Asociación Española de Ingeniería Estructural (ACHE). Publicado por Cinter Divulgación Técnica S.L. Todos los derechos reservados. 1. BACKGROUND In this paper, the project for the refurbishment of the large the different phases of the project, from the appearance of the span roof with structural membrane of Estadio de La Cartuja first incidents to the execution of the finally adopted solution, in Seville (figure 1), Spain, is described. Its aim is to go through in order to establish conclusions and Lessons Learned to be applied in similar situations in the future. * Persona de contacto / Corresponding author: Correo-e / email: [email protected] (Enrique Goberna Pérez). Cómo citar este artículo: Goberna Pérez, E., Stockhusen, K., Schlaich, M. (2021) Membrane Substitution of La Cartuja Stadium Roof in Seville, Spain, Hormigón y Acero, 72(294-295), 85-97, https://doi.org/10.33586/hya.2021.3049 Goberna Pérez, E., Stockhusen, K., Schlaich, M., (2021) Hormigón y Acero 72(294/295); 85-97 – 85 Figure 1. Olympic Stadium “La Cartuja” in Seville. Credit: La Cartuja Stadium SA. 2. LA CARTUJA STADIUM ROOF La Cartuja Stadium is a multi-purpose stadium located in Isla de la Cartuja in Seville, Spain (figure 2). It was built to be the flagship of the Olympic dream of Se- ville. Inaugurated on 5 May 1999, it hosted the World Cham- pionships in Athletics in August of the same year. The stadium was one of the largest stadiums in Spain at the time . The design provided the opportunity to, if necessary, lower the pitch and fully convert the facility into a football stadium only. In such case, a new grand-stand would occupy the space that today belongs to the athletic field. The sports facility houses offices as well as a hotel. Figure 2. La Cartuja Stadium, Inside view Credit: schlaich berger- The roof was designed as a spoke wheel structure, with mann partner. one outer four chord truss compression ring, alternating ra- dial ridge (upper) and valley (lower)cables and a single inner radius (figure 4) . The compression ring rests vertically on the tension ring. A PVC coated polyester fiber membrane was in- building structure, and does so in an eccentric manner, as the stalled in between the cables, working as a climatic barrier. stadium geometry does not exactly match the geometry of the There are many variants of the spoke wheel structural sys- compression ring.1 tem applied to roof structures [1]. A very typical example is the Tension ring: The inner edge of the roof, formed by a bun- one with two outer compression rings and one inner tension dle of eight fully locked steel cables. Its geometry is homothet- ring. This version was applied for the stadium roof of La Car- ic to the one of the compression ring. The tangential catwalk tuja, featuring some particularities that are explained next [2]. for maintenance hangs directly from the tension ring. The most relevant parts of the roof structure are the fol- lowing: a) The stadium was designed by the architectural practice Cruz y Ortiz Ar- Compression ring: A three-dimensional steel truss formed quitectos that, together with the contractor ACS and the local structural consultant AYESA, won a Design and Build competition. The structural en- by four built-up rectangular section chords. The plan geometry gineering for the building project was commissioned to AYESA, while the of the ring in plan is formed by two tangent curves of different structural design of the roof was finally commissioned to schlaich berger- mann partner 86 – Goberna Pérez, E., Stockhusen, K., Schlaich, M., (2021) Hormigón y Acero 72(294/295); 85-97 Figure 3. Tangential cut of a membrane bay. Connection to upper radial cables and interwoven with lower radial one Credit: schlaich bergermann partner. Radial cables: The roof has 88 radial cables. Half of them the catenary cable connects the anchorage points of an upper are connected from the upper inner chord of the compression radial cable and a lower one at its junction with the compres- ring, being these the ridge cables. The other half of the cables sion ring. are connected from the lower inner chord of the compression The roof structure of the La Cartuja Stadium is an exam- ring, these being the valley cables. What makes this roof very ple of a very efficient and economical application of the spoke particular is that the radial cables, ridge and valley cables, are wheel system to cover large spans. alternating and never coincide on the same radial axis. The ra- dial cables span 40 m between the inner edge of the compres- sion ring and the tension ring. Tension ring node: The intersection between the tension 3. ring and the radial cables, either valley or ridge cables, are ma- STRUCTURAL PATHOLOGY terialized by a high resistance steel casting node. These ele- ments are transferring the deviation forces from the tension At the beginning of March 2018 there were torrential rains in ring to the radial cable. Seville combined with strong west winds. On March 4th, La Membrane: Woven between the radial cables, the mem- Cartuja Stadium maintenance management warned of large brane is the element to shade and protect the spectators from water accumulations in the membrane with associated plastic sun and rain. It is a polyester textile membrane coated with strains. At this point, the roof had been in use for 20 years PVC. The membrane panels go from ridge cable to ridge cable without any incidents, but now a problem related with an ab- through the corresponding intermediate valley cable. In this normal drainage on the roof was reported. This was immedia- way, the runoff rainwater is naturally conducted by the lower tely notified to the architects, who forwarded the issue to the radial cable to the drainage point at the lower inner chord of engineers of the roof. 2 the compression ring. There were eight ponds located at the valleys of the five The membrane panels are continuous between two upper membrane panels on the west side of the roof (figure 5). The radial cables (ridge), joined to them by stainless steel straps water ponds occurred at a variable distance between 3m and attached to the membrane edge by an aluminum profile called 10m from the tension ring, in any case, at the third of the span a “keder”. The membrane is intertwined with the lower radi- of the roof closest to the tension ring. al cable (valley) without any mechanical means. In this way, After the notification of the problem and the preliminary the lower radial cable (valley) can slide freely in relation to analysis of the photographs received, it was determined that the membrane (figure 3). This makes the membrane easier to the drainage problem would not compromise the global struc- install since the number of stainless-steel belts and keder pro- tural integrity of the roof, although it could lead to a local fail- files (aluminum profile edges) is reduced significantly. This is ure of the membrane. Therefore, a series of immediate meas- not necessarily a structural or mechanical advantage, but it is ures to be carried out on the roof were communicated (figure economical.

Load more

  13

Copy Link