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The Tale of the Morandi Bridge

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The Tale of the Morandi Bridge Structural Engineering International ISSN: 1016-8664 (Print) 1683-0350 (Online) Journal homepage: https://www.tandfonline.com/loi/tsei20 Once upon a Time in Italy: The Tale of the Morandi Bridge Gian Michele Calvi, Matteo Moratti, Gerard J. O'Reilly, Nicola Scattarreggia, Ricardo Monteiro, Daniele Malomo, Paolo Martino Calvi & Rui Pinho To cite this article: Gian Michele Calvi, Matteo Moratti, Gerard J. O'Reilly, Nicola Scattarreggia, Ricardo Monteiro, Daniele Malomo, Paolo Martino Calvi & Rui Pinho (2019) Once upon a Time in Italy: The Tale of the Morandi Bridge, Structural Engineering International, 29:2, 198-217, DOI: 10.1080/10168664.2018.1558033 To link to this article: https://doi.org/10.1080/10168664.2018.1558033 Published online: 20 Dec 2018. Submit your article to this journal Article views: 1087 View related articles View Crossmark data Citing articles: 10 View citing articles Full Terms & Conditions of access and use can be found at https://www.tandfonline.com/action/journalInformation?journalCode=tsei20 Once upon a Time in Italy: The Tale of the Morandi Bridge Gian Michele Calvi , Eucentre Foundation, Pavia, Italy; Matteo Moratti, Studio Calvi Ltd, Pavia, Italy; Gerard J. O’Reilly , IUSS, Pavia, Italy; Nicola Scattarreggia , IUSS, Pavia, Italy; Ricardo Monteiro , IUSS, Pavia, Italy; Daniele Malomo , Mosayk Ltd, Pavia, Italy; Paolo Martino Calvi, University of Washington, Seattle, USA; Rui Pinho , University of Pavia, Italy. Contact: [email protected] DOI: 10.1080/10168664.2018.1558033 Abstract the 1960s that most European countries constructed the backbone of the modern On 14 August 2018 at 11:35 AM, a relevant portion (about 243 m) of the viaduct over freeway system. In Italy, the 760 km the Polcevera river in Genoa collapsed, killing43people.Thebridgewasdesignedin “Autostrada del Sole” freeway system the early 1960s by Riccardo Morandi, a well-known Italian engineer, and opened to linking Milan to Rome and Naples was the public in 1967. The collapsed part of the bridge essentially comprised an designed and built between 1956 and individual self-standing structure spanning 171 m and two simply-supported 1964, coinciding with the American connecting Gerber beam systems, each spanning 36 m from the self-standing “greatest decade”. Regardless of its rela- structure to the adjacent portions of the bridge. This paper aims to reminisce the tively small length, this freeway rep- complete story of the bridge, from the Italian construction boom in the 1960s to resented an achievement of sorts, due some of the issues that soon arose thereafter: the strengthening intervention in the to the ingenuity required for its con- fi 1990s, the subsequent structural monitoring and, nally, the strengthening project ception and construction, as a result of never brought to fruition. Potential reasons for the collapse are discussed, together the challenging topography of the with some of the possible inadequacies of the bridge, its maintenance and loading Italian territory, particularly in the fl fi history based on critical re ection, comparison with speci c features of bridge mountainous area between Bologna construction practice today and results obtained using numerical models with and Florence. Indeed, a total of 853 fi fi different levels of re nement. Since the entire matter (speci cally the debris) was bridges and viaducts (without consider- fi considered classi ed by the investigating magistrate in the immediate aftermath of ing 572 overpasses) and 38 tunnels the bridge collapse, this work is based entirely on publicly available material. needed to be constructed. Keywords: Morandi Bridge; structural collapse; forensic engineering; AEM There is little need for any detailed analy- modelling sis to state that a significant fraction of both North American and European infrastructure has reached or is reaching its nominal design life, requiring the allo- Introduction the programme and opposed the cation of relevant resources for their reduction of a temporary USD$0.01 assessment, repair and upgrading. In par- Construction of Road gas tax per gallon (≈ 3.8 litres) estab- ticular, entire inventories of structures Infrastructure in the 1960s lished to fund the Interstate Program. areinneedofassessmenttoallow By the end of 1966, some 29 000 km It is commonly stated, and easy to rational prioritisation in the allocation of highways had been completed, with verify, that the 1960s were an extraordi- of limited resources available. This a total cost of about $25 billion. Accord- nary time for the construction of free- implies the issue of rapid assessment ing to a document submitted to the US ways. The era of great bridge methods to perform an initial screening, Congress in 1965,3 the complete system construction had started much earlier, followed by the application of more (which required additional funding esti- fi as masterfully described by Petrovsky1 re ned approaches (with a proportional mated to be about $20 billion) would with main reference to the US, but acquisition of more data) to a limited have included “12,957 interchanges bridges were perceived as standalone number of cases and possibly the requiring 22,252 individual structures, masterpieces to cross rivers or straits, implementation of effective and well- as well as 20,748 other highway grade- fi rather than part of a roadway system. focused monitoring systems in speci c separation structures, 4,361 railroad It was on 29 June 1956 that President situations. The collapse of the bridge in grade separations, and 14,806 other Eisenhower signed the Federal-Aid Genoa has attracted media attention bridges and tunnels”. 4 Highway Act in the US, initiating the worldwide, with The New York Times “Greatest Decade”,2,3 or the construc- In Europe, the construction of freeways recently summarising that: tion of the Interstate System that orig- started much earlier with the initial but inally included around 60 000 km of limited experience in Italy in the 1920s . in France, the national non-conceded roadways. When the Eisenhower and a massive programme in Germany highway system comprising 12 000 administration ended in January 1961, in the late 1930s, where some 4000 km bridges is in a state of chronic under- about one fourth of this system had of roads were built between 1935 and investment, with 7% having damage been opened to traffic. With an 1940, which inspired President Eisen- that could eventually result in col- average construction of about 5000 km hower to say: “Germany had made me lapse if not addressed; per year, President Eisenhower’ssuc- see the wisdom of broader ribbons . in Germany, of the 39 621 bridges cessor, President Kennedy, refused to across the land”.2 However, it was after monitored by the Federal Govern- follow the suggestions of cutting back the Second World War and mainly in ment, 10.6% are in a condition that This article has been republished with minor changes. These changes do not impact the academic content of the article. 198 Scientific Paper Structural Engineering International Nr. 2/2019 is not satisfactory and 1.8% are in problems related to creep, temperature raced across the Pacific Ocean “inadequate” condition; variations, strand relaxation, redistri- devastating Hawaii, Japan and the bution effects in statically indetermi- Philippines. to name but a few, with similar examples nate structures, nonlinear and . On 26 July 1963, a much smaller reported for other European countries. ultimate response, were only intui- earthquake (Mw = 6.1) hit Skopje in tively considered, and sometimes Macedonia inducing more than 1000 simply neglected. It was only years victims and leaving more than 200 Design of Bridges and Pre-stressed later, with the development of dedi- 000 people homeless. About 8.5% Structures in Italy in the 1960s cated software, that it became possible of the buildings were destroyed, to model most of such complex time- 34% had to be demolished and 36% In the aftermath of the Second World dependent effects. required major repairs,9 whereas the War, bridge design was essentially retra- 15th century stone bridge over the cing the experiences of the 1930s and In the context briefly depicted above, river Vardar was not reported to the dominant structural system was Riccardo Morandi was a very unique have suffered major damage. In the probably still the arch.5 Concrete arch individual and the bridge over the Pol- aftermath, a school building was bridges had recurrent spans in the cevera river in Genoa was a very base isolated using rubber bearings, range of 60–80 m and even in the con- unique design case, reflecting each for the first time in the world.10 struction of the Autostrada del Sole,a other. The bridge was cable-stayed . On 27 March 1964, a M = 9.2 (the span of 100 m was regarded as a limit with single post-tensioned concrete W largest ever recorded in North for standard practice. Trafficloads stays and spans exceeding 200 m. The America) earthquake occurred in were not significantly smaller with deck was temporarily pre-stressed Alaska, not far from Anchorage. Per- respect to those considered today, with during construction and locally post- manent ground displacements in the the exception of the maximum uni- tensioned in its final configuration. range of 9 m were recorded. The formly distributed load, which was set The connecting simply supported Seward Highway was devastated at 4 kN/m2, against the 6 kN/m2 typi- spans were made of 36 m precast pre- and severe damage to bridges was cally adopted nowadays. Cable-stayed stressed Gerber beams. It is evident reported, such as the span of the bridges were seldom considered, prob- that the definition of “cable-stayed Million Dollar Bridge that slipped ably because of the circular problem bridge” refers today to quite different off its pier due to soil liquefaction.11 of absorbing the axial force component structural configurations,8 with a large in the deck that tended to increase its number of stays used also as progress- cross-section size, which in turn would ive supports for the deck, to be kept In Italy, one of the most tragic cata- imply a higher self-weight, and hence as light as possible.
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