In 1931, Pier Luigi Nervi (1891-1979) published the article “Scienza o Arte dell’ Ingegnere?” on the magazine of “L'Ingegnere”. Why did he give importance to art not science? This paper therefore focuses on a process how Nervi led to such design philosophy and then examines architectural works of the construction company which Nervi and Nebbiosi established in 1923 (hereinafter called “N&N”).
This first chapter clarifies Italy's social background around 1930s after the first world war (hereinafter called “WWI”). In a trend between statically determinate and indeterminate around Italy, it was shown that statically determinate was preferred to statically indeterminate during WWI and Autarky. The reason for architects and contractors to be afraid of indeterminate structure was because of its incomplete calculation at that time.
In chapter two, the roofs of two theaters are examined. Nervi was involved in each work from halfway through their projects. Neither in Prato nor Naples, the roof construct didn't realize without Nervi. Also, it was shown that their structure needs rigidity in each joint to support a heavy equipment to open and close its skylight and roof's structure, that results in a statically indeterminate structure.
In chapter three, its roof with cantilever beam and the stands in Berta Stadium was investigated. Nervi mentioned that it is important to put a center of gravity of its structure among two pillars to support the stands, to avoid an excessive reinforcement of its foundation. According to the analysis, it was shown that there are rigid joints between roof and stand or between stand and foundation.
In chapter four, the points at issue of his article on the magazine are checked briefly with criticism of it. The editor of “L'Ingegnere“ criticized that Nervi's opinion leads other engineers to empiricism. On the other hand, at first of the article Nervi doubted absoluteness of science. Also, he had a critical opinion for a trend and movement decide that an art is a rational architecture without personality.
In chapter five, his process and design philosophy were discussed with upper chapters. The reason why Nervi required an experience is because of his preference for a statically indeterminate structure with rigid joints of reinforced concrete in a roof construction of N&N, following the bridge of Pescia in SACC. Its calculation become so complicated. The usual solution at that time, was to increase the dimension and amount of material, based solely a calculation with safety factor. Yet Nervi, with his own experience, aspired to find the thin and minimum dimension. Yet it was so difficult to get to the correct and real answer. Furthermore, Nervi asserted that he designs not only with his experience but also with formulas based on calculation in a design process.
As a conclusion, Nervi considered a calculation as one of the factual basis for the decision and he showed a choice of an experience of construction as “Arte” instead of an absolute trust for a calculation as “Science”. He aimed at their compatibility in his design process.
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