Doctor Arquitecto

Doctor Arquitecto

jueves, 16 de noviembre de 2023

La Giralda y el Sismo




Este es el último post de la serie sobre la Giralda. Comenzamos por la Geometría, seguimos con el peso propio y el viento. Terminamos con el Sismo.
En los dos artículos sobre viento y peso propio he discutido las ventajas e inconvenientes del uso del método de los Elementos Finitos en Obra de Fábrica.
En este post vamos a usar el análisis modal espectral. Como la torre sigue comprimida en su totalidad debido al peso propio, no tenemos problemas de grietas que invaliden un modelo lineal. Sigue pendiente la cuestión del módulo de elasticidad.
Por último indicar que el programa Sap 2000/15 nos da la envolvente de valores en deformada y tensiones, por lo que he tenido que modificar el signo de algún dato y obviar la forma de la deformada, teniendo en cuenta solo el valor absoluto de los desplazamientos.
La conclusión es que el sismo afecta algo mas que el viento a la torre. En rascacielos normalmente sucede al revés incluso en zonas de alta sismicidad a partir de los 200 metros de altura y esbeltez 3.
La esbeltez disminuye el efecto del sismo, la masa lo aumenta. En el caso de La Giralda es cierto que se trata de una torre masiva.




La Giralda y el Sismo


Miguel Angel Cobreros Vime Dr Arquitecto.
Modelo: Miguel Cobreros Martinez-Bidón. Arquitecto

sábado, 11 de noviembre de 2023

Historical Sights and Landmarks of Seville, Spain. 1254-1929

Historical Sights and Landmarks of Seville, Spain. 1252-1929

Introduction


The decision of King Pedro I of Castille, almost a century after the Castilian conquest of Seville, to build the Mudejar Palace, introduces a stylistic variant, the múdejar of Almohad origin, in the architecture of the city. Mudejar influenced the Gothic, Renaissance and Baroque architectures of Seville and consolidated its influence in the regionalist architecture of the early 20th century. However, in Seville, there are rigorously Gothic architectural landmarks, such as the Cathedral, Renaissance ones, such as the “Archivo de Indias” (old chamber of commerce) and fully Baroque like San Telmo Palace.
 In this informative article on the historical landmarks of my city, Seville, I have gathered and expanded a set of small articles I have published on social networks over the last five years.
The format is always the same, a historical commentary together with a brief architectural analysis. I accompany each of them with a link that I consider of interest to host the information on each building.
The period considered goes from the year 1254 with the construction of Las Atarazanas (The Shipyards) until 1929 in which the Plaza de España is finished. All the buildings are in the historical centre of the city or close to it.
Seville had two periods of economic and therefore architectural splendour, the first one after the conquest of the city by the Kingdom of Castille and the second after the discovery of America, both periods linked to the Port of the city in the Guadalquivir River. The historical centre of Seville has 400 hectares, close to the 500 hectares of Venice and with it the largest city in Europe during the Middle Ages and part of the Renaissance. In the old town of Seville we can find valuable examples of Gothic, Mudejar, Renaissance and Baroque architecture.

I have only included the large scale buildings, eleven in total:
o   Atarazanas (The Shipyards)
o   Gothic and Mudejar Palaces of the Alcázar
o   Cathedral
o   Giralda
o   Hospital de las cinco Llagas (Hospital of the Five Wounds)
o   Archivo de Indias (Historic chamber of commerce)
o   Museum of Fine Arts
o   Palace of San Telmo,
o   Royal Tobacco Factory
o   Plaza de España.


The  Shipyards (1252)





The Atarazanas (The Shipyards) were, together with the Port, the industrial and commercial engine of Seville from the 13th century until the Discovery of America at the end of the 15th century. They were the main shipyards in Castille and later in Spain. They were built by Alfonso X of Castile from 1252.
The activity of the Shipyards was an economic boost for the city that allowed, for example, the construction of the Cathedral.
Its 17 consecutive vaults with arcades, of 100 meters long and 11 meters wide, occupied an area of 19,000 square meters. The original height was 11 meters and they were built at the level of the River so that the ships could easily slid to the water.

 It is built with a strong brickwork with semicircular arch vaults over pointed arches. This arrangement allows light to enter under the vaults and over the pointed arches. The mixture of circular and ogival arches recalls the constructive solution of the Church of Santa Ana in Triana, built at the same time by Alfonso X of Castille.

Fernando of Aragón's decision to promote the Barcelona shipyards marks the beginning of a process of destruction and changes of use. In 1534, the height of the building was raised by means of a 5-metre fill. The Hospital de la Caridad occupied 5 naves of the original building. It became successively The Trading House and Artillery Factory. In this process, 10 of the 17 original arcades were destroyed, leaving 7 arcades embedded between the Hospital de la Caridad and the stopper building of the old Artillery Factory.
Fortunately, the recently approved refurbishment project, paralyses the process of destruction of the building but also transforms it by adding new elements.



Gothic Palace, Alcázar de Sevilla. (1254)








Original Construction: 1254, Alfonso X de Castilla
Reform after the Lisbon Earthquake: 1758, Arch: Van der Borcht

The Gothic Palace of the Alcazar of Seville was built by Alfonso X of Castille, on the grounds of the former Almohad Alcazar. It was a construction of two parallel bays and two perpendiculars that formed a rectangular building. From the original Gothic construction we have the Hall of the Vaults in the first bay, the Chapel in the perpendicular bay adjacent to the future Mudéjar Palace and the baths of Doña María in the basement.

The work carried out by Van der Borcht, after the Lisbon earthquake, adds the Salon of Tapestries in the second bay, built with vaulted vaults and the entrance portico in a marked Baroque style. The result of his action in the Palace and the Courtyard of the Cruise is somewhat confusing, the visitor seems to be in the most modern part of the Alcazar being, in part, the oldest. If the access to the Baths of Doña María were transferred to the interior of the palace, the building would be undertood better.


Mudejar Palace. Alcázar of Seville. (1350)







The decision of Pedro I of Burgundy, King of Castille, to contract islamic masons (Alarifes) from Seville and Granada to build his palace in the Alcazar of Seville (The Mudejar Palace), had a decisive influence on the architecture of the Renaissance and Baroque Sevillian. With this decision the King moves away from the Gothic style used by other European kings.

King Don Pedro built the ground floor of the Palace in a delicate Almohad style, for which his friend and ally the King of Granada sent him his alarifes. The cause of this surprising decision may be in the cultured and refined character of Don Pedro. The broken entrance, the use of ceramics and plasterwork, the location of the divan in the Patio de Las Doncellas, etc. are characteristics that had to be revolutionary for a palace of a Christian king.

The King of Granada, Mohamed VI, upon seeing the result obtained by his ally decided to build the Alhambra surpassing the model of the Sevillian Mudejar Palace, which is therefore a precedent built by a Christian king of the magnificent Andalusi palace.
The Múdejar has influenced the Sevillian architecture of the Renaissance, Baroque and Regionalism. Its ornamental character, the use of ceramics and plasterwork became a standard of Sevillian architecture. A good example are Houses-Palaces built by the Sevillian aristocrats during the Renaissance (the Great Houses to which I refer are: Casa de Pilatos, Palacio de las Dueñas, Palacio de los Marqueses de la Algaba and Casa de los Pinelos).

The successive kings of Castille maintained the initial style in the construction of the upper floor and in various reforms that end in the time of Emperor Charles V. Of these rooms, the Ambassadors Hall with its splendid coffered dome and the Doll´s Patio stand out.


Construction period: 1350-1540. King Don Pedro-Emperador Carlos V.





The Cathedral  1400







The cathedral what built by the citizens of Seville. Work began by decision of the Chapter and was financed by the guilds and families of merchants who had prospered in the economic boost  due to the Port and the Shipyards.

Gautier said of the Cathedral that it was like a "Hollow Mountain"; according to the French writer, in the cathedral of Seville one could navigate comfortably between its seven naves and its large pillars like towers.

It is indeed a very large cathedral of 118 x 78 meters in floor plan and 40 meters high. It is the largest Gothic cathedral ever built. And it is documented that this was the intention of the promoters of the Cathedral: "Let's make a church so beautiful and so grandiose that those who see it carved consider us crazy" and according to the capitular act of that day the new work should be "such and so good, that there is no other its equal". The Cathedral hosts a monumental space that we can enjoy strolling between its pillars and naves. It is a space that has the verticality of the Gothic and that extends horizontally as in a Mosque.

Its seven naves and its floor plan mean that there is no hierarchy of the main nave like other cathedrals. When we enter we do not have as reference point the major axis and the altar, for that reason we can walk through the interior of the Cathedral without clear points of reference. It is therefore a fairly homogeneous space that we cannot capture immediately. The set of Renaissance buildings surrounding the Cathedral contributes to this, because from the outside it is difficult to understand the shape of the Cathedral.

The construction of the Cathedral of Seville began in the 1400s under the direction of Charles Galter, he designs it in rigorous Gothic with quadripartite vaults in the five central naves and sixpartite on the two sides. The crossing vault and the old spire had numerous problems in the events of earthquakes until it was replaced by a star vault in the sixteenth century, and rebuilt with the same shape was the nineteenth century.

During the 16th century several rooms and chapels were added to the Cathedral, with the intervention of architects Hernan Ruiz II, Diego de Riaño, Gil de Hontañón and Martín de Gainza. The most important are: The Main Sacristy, the Royal Chapel and the Chapterhouse, as well as the Church of the Tabernacle in the seventeenth century. In these halls and chapels the Renaissance style is predominant with domes and vaults of great value. The dome on pendentives and toroids of the Sacristy Major, the oval dome of the Chapter House and the vaulted vaults of the Church of the Tabernacle have been object of numerous studies and structural analyses.

Also in the 16th century, Hernán Ruiz II reformed the old Almohad minaret and converted it into La Giralda, as we shall see in the following section.
In it lie the Kings of Castile Ferdinand III, Alfonso X the Wise and Peter I. The Cathedral also houses the tomb of Christopher Columbus.




The Giralda Tower (1184 and 1566)







The Giralda is a beautiful and impressive tower that has become a symbol of Seville. It is a mixture of the Almohad tower (bottom) and the Renaissance bell tower (top), the result is homogeneous, its components are not distinguishable.

We can say that it is a perfect symbiosis of the powerful tower of Ben Basso and the magnificent design of Hernán Ruiz. The Almohad minaret dates from 1184 and the Renaissance solution dates from 1566. The success of the solution made the Giralda a model for the Renaissance towers in Andalusia.

Technically it has a structure of double masonry walls with a square floor of 13 metres on each side, which Hernán Ruiz takes advantage of by supporting the top of the Almohad tower with the “Body of Bells” on the external wall and supporting  the bodies of the “Clock” and “Carambolas” on the internal tube.

Hernan Ruiz raised the tower’s height from the original 75 meters to the current 92 meters.

The material chosen for its construction is the dry pressed bricks of the Guadalquivir River, which has always been used in Seville. The base of the tower is reinforced with limestone.

The foundation based on an extensive improvement of the pre-existing terrain allows Hernán Ruiz to add 3,000 tons of weight to the 14,000 tons of the Ben Basso tower. The Giralda is named after the Giraldillo, a massive 4m height bronze sculpture which is also a weather vane, located on the top of the tower. 

The Tower has withstood all the earthquakes that have occurred in Seville since its construction with solvency. In this blog I have four published analyses on the Giralda. The first one describes the structure and its geometry, the second is a structural analysis of its own weight and the third and fourth are structural analyses against wind and earthquake. The conclusion of the analyses is that the foundation makes the Tower possible. The brickwork resists perfectly, and the centre of gravity of the double-wall structure moves very little with wind and earthquake, thanks to the weight of the Tower and its perimeter distribution. But it was necessary to improve the terrain to resist the pressure that the tower transmits to the terrain.


The Hospital de Las Cinco Llagas (1535)





The Five Wounds Hospital, (Hospital de las Cinco Llagas) closes the monumental complex of Seville to the north, is located outside the historic walls, in what is the neighbourhood of La Macarena. This Monument marks the beginning of the fertile Renaissance period of Sevillian architecture, to which I have already referred, with the Houses-Palaces, the Salas de la Catedral and The Giralda. Also of interest is the Monastery of San Isidoro del Campo, near the archaeological site of the Roman city of Italica.

It was built by Martín de Gainza following the ideals of hygiene and healthiness of the Renaissance Hospital. Four large cloistered courtyards of 40 metres on each side illuminate and ventilate the large cross room for the sick, a small altar was placed in the centre of the cross.

It is a large building, rectangular 174 by 161 meters, organized around 8 courtyards, 4 cloisters with semicircular arches and four smaller courtyards. The façades are arranged in a Tuscan order on the ground floor that supports the upper Corinthian order.

The quasi-baroque façade was designed by Miguel de Zumárraga; if we cross it we find the Church of the Hospital designed by Hernán Ruiz II. This is the first Sevillian example of a single nave church. The church is isolated and exempt in the entrance courtyard, and its vaulted domes and its magnificent Ionic interior order stand out.


El Archivo de Indias. The Old Trading House. (1584)





The Archivo de Indias, The old Trading House, is the most sober and classic building built during the Renaissance in Seville. Ceramics are not present in its design accompanying the brick seen, neither the plasterwork in the Patio, even does not have a Cover in facade. However, it is a magnificent example of Renaissance architecture.
The whole building is organized with one module or order. The rhythm of pilasters that modulates the façade is not arbitrary, it is closely related to the architectural organization of the building. The module or order that we can see in the arches of the courtyard, the vaults and galleries, coincides with the distance between pilasters of the façade.

The central courtyard of five modules or orders is reflected in the five central modules of the facades. The courtyard gallery occupies a module on both sides of the five central modules. The archive rooms occupy the two orders at the ends of the façade.
When the pilasters are duplicated, they show us the thickness of the interior walls or arches, managing not to lose the rhythm of the module.

Every element of the building is related to the others by means of this modulation.

This building was the central element of my PhD Thesis on the influence of classical orders on the structural organisation of Renaissance civil buildings. One of the conclussions of the Thesis is that the Orders were Ornament and Foundation of the architectural project and that their influence came from the structural origin of the classical orders. In the Archives the ideal of Leon Battista Alberti is fulfilled that all the elements were related to each other and to the building as a whole; the orders are at the centre of this relationship.

The vaults of the upper floor are built with carved limestone, as well as well designed have an excellent structural performance for more than 8 meters of light. These vaults follow the canon established by the Andalusian architect Alonso de Vandelvira, in his treatise on architecture. The book by José Carlos Palacios, Traces and Cuts of Stonework in the Andalusian Renaissance, describes this type of vault in an excellent way.



Museum of Fine Arts (1602)




















The Museo de Bellas Artes de Sevilla is a transitional building between Renaissance and Baroque in Seville. It was designed by Juan de Oviedo in 1602 for the Convent of La Merced. Reformed in 1722 by Juan de Figueroa, the Sevillian Baroque architect. In 1835 the building was used as the Fine Arts Museum and has the second art gallery in Spain, after the Prado Museum in Madrid.

It is articulated around three large courtyards and has fourteen rooms. The room dedicated to Murillo, which is the former chapel of the convent, stands out for its content. The rooms dedicated to Zurbarán and Valdés Leal complete the exhibition of the best Spanish Baroque religious painting.



San Telmo Palace (1722)




The San Telmo Palace, with its magnificent façade, is the great Sevillian Baroque building. It dates from 1722 and is located outside the walls and at the southern end of the monumental complex of Seville. It was the Palace of the Dukes of Montpensier in the 19th century, when Seville was the "Little Court" due to the aspirations to the throne of Duke Antonio de Orleans. The Duke began a new stage of splendour in the city, with his palace and gardens that astonished everyone.

The building was built by the University of the Merchant Navy. In 1722, the Baroque architect from Seville, Leonardo de Figueroa, was in charge of the works that lasted until 1796, being the architect Lucas Cintora who finished the building.

From 1849 to 1897 it was the official residence of the Duke of Montpensier. The Montpensier family wanted to make Seville a capital parallel to Madrid, and they succeeded. Hence the name of the Montpensier Court. For this they needed, among other things, a large residence. They reconverted the University  into a Palace and built large gardens, designed by the French engineer André de Lecolant, which were the germ of the current Maria Luisa Park. In 1897 the Orleans family donated the building to the Archbishopric and the gardens to the city.

The Archbishopric turned it into a Seminary and in 1992 it became the seat of the Presidency of the Junta de Andalucía.

Leonardo de Figueroa designed a rectangular building, with a central entrance courtyard and chapel at the back, with two large side courtyards.

The façade is organised in two floors with powerful cornices arranged by pilasters. It is built with exposed brick and its almagra and albero colours define the Baroque façades in Seville. The main façade, of an exuberant Baroque style, consists of three superimposed bodies: Entrance, Balcony and the Arch of San Telmo. The chapel is Baroque with a barrel vault and an elaborate altarpiece.

Façade, entrance courtyard and chapel are the only elements that have survived the transformations of the twentieth century.

Leonardo de Figueroa is the central figure of Baroque architecture in Seville. The churches of La Caridad, El Salvador, San Luis de los Franceses, Iglesia de la Magdalena and Los Venerables are splendid examples of Sevillian Baroque.



The Royal Tobacco Factory . (1730)




The Royal Tobacco Factor   together with the Atarazanas and the Archivo de Indias are the three great historical buildings of commercial and industrial use in Seville. Their construction was ordered in 1728 by King Philip V and is the great contribution of the Bourbons to Sevillian architecture.

It occupies a very large rectangular block, 185 by 147 metres. It was designed by the Dutch engineer Sebastián Van der Borcht, author of the reform of the Gothic Palace of the Alcazar after the Lisbon earthquake.

Van der Borcht designed the building with neoclassical rigor, the facades are ordered with pilasters that occupy the two floors of the building. Over the austere and classic background built in limestone, its Baroque sculptured surround main doors, stand out. Constructively it is very interesting its foundation on inverted arches that solves the problem of the underground Tagarete stream.

The Patios of the Fountain and the Clock, surrounded by Renaissance-inspired arches, arrange the whole inside. The 1954 reform of Balbontín and Toro Buiza made the building lose its industrial character.

Being the most important industrial building built in Spain in the 18th century, its size is close to that of El Escorial. In 1954 it became the headquarters of the University of Seville.



Plaza de España 1929.



The time elapsed between the construction of the Royal Tobacco Factory and Plaza de España tells us how Seville entered a period of decadence, with an absolute lack of attention and investment on the part of the Government of Spain, which from Philip V, directs its attention to the North. It is evident that Seville's geographical location makes it lose interest in the face of the strong industrial development of European countries. Around the Ibero-American Exhibition in 1929, a very regionalist architectural renaissance arose in the city, of which the Plaza de España building is the main exponent.

The Plaza de España is one of the three great buildings outside the walls of Seville. The other two are the Hospital de las Cinco Llagas from the 16th century and the Real Fábrica de Tabacos from the 18th century.

It was built by Aníbal González for the Ibero-American Exhibition at the beginning of the 20th century. Its size is impressive.

It is a classicist-inspired building with a semi-circular floor plan and a diameter of 170 metres. Aníbal González said that it had been based on the Spanish Renaissance and on some villas of Palladio for the layout in plant. The buildings that surround the square are structured in a central building, wings with intermediate buildings that compensate an excessive length and towers at the ends. This floor plan responds very closely to the formal scheme of the type of Palladian villa with curved wings, such as the villa Bader or villa Trissino in Meledo, shown by the Italian architect Andrea Palladio in his Four Books on Architecture, a treatise that Aníbal González knew.

In spite of its classicist design the Cinema has chosen it many times to recreate exotic environments or cities like Jerusalem or Damascus. Perhaps it is the light of Seville, the predominant colour of the brick kneaded with mud from the River or the colour of the sky. The decorative use of ceramics also helps to imagine oriental environments.
Or simply it is about its scenographic character, very turned towards the outside and easy to use by the industry of the Cinema.

The building was originally designed to house the University, however it has always had various administrative uses of a military nature.

Aníbal González built numerous regionalist and modernist houses, but it seems to me that it is the Hotel Alfonso XIII of José Espiau, of an excellent Mudejar style, the other exponent of the best architecture of this period in Seville.



Miguel Angel Cobreros Vime. Doctor Arquitecto.

References: Monumentos de Sevilla. cobrerosvime.blogspot.com