Professionalism, Collapse of the Morandi Bridge

History and Design

The Morandi Bridge, officially named the Polcevera Viaduct, was born from the necessities of post-war Italy’s economic miracle. As Genoa expanded in the 1960s, a vital link was needed to connect the city’s industrial districts with the Italian Riviera and France. The bridge was not just a piece of infrastructure; it was a physical manifestation of the country's desire to modernize and connect its disjointed landscape [1]. This ambition was helmed by Riccardo Morandi, a celebrated civil engineer described as a pioneer in the field. Morandi was renowned for his innovative, albeit controversial, use of reinforced concrete, believing it to be a material of the future that could rival steel in elegance and durability [2].

Built between 1963 and 1967, the bridge was technically unique among cable-stayed structures as Morandi employed a proprietary 'pre-stressed concrete' system. Unlike traditional designs where steel suspension cables are exposed, Morandi encased his steel stay cables within concrete shells. The design choice was intentional as the concrete casing was designed to protect the inner steel from the corrosive saline air of the Mediterranean Sea and minimize maintenance [3]. At its opening, the bridge was hailed as a masterpiece of engineering, and it stood as a symbol of Italian modernization, representing the height of the nation's engineering prowess before its tragic collapse revealed the fatal flaws hidden within its design.

Collapse

On the morning of August 14, 2018, the city of Genoa was gripped by a violent weather system. At 11:36 a.m., amidst the storm, a 210-meter section of the Morandi Bridge surrounding Pillar 9 collapsed, sending vehicles plummeting 150 feet to the ground. Meteorological analysis confirms that the collapse coincided with a ‘downburst’, a severe, localized wind system associated with a thunderstorm, which brought torrential rain and lightning that reduced visibility to near zero just as the structure failed [4]. The timing of the disaster amplified the tragedy; it occurred on the eve of Ferragosto, a major Italian summer holiday on which the bridge was often crowded with families and tourists. The collapse claimed the lives of 43 people. The victims were a mix of locals and international travelers [5].

The immediate aftermath was chaotic and desperate. Firefighters and emergency crews rushed to the scene, digging through massive slabs of concrete and twisted steel to find survivors. The collapse severed a critical artery for the city and forced the evacuation of over 600 people living in the apartment blocks directly beneath the remaining spans, creating a ‘red zone’ of displaced residents. The event instantly transformed the bridge from a celebrated engineering icon into a national symbol of sorrow and systemic failure [1].

Technical Causes

Investigations found that the collapse was caused by “the rupture of the load-bearing cables inside the stay of the bridge's ninth pillar, which were eaten away by a highly corrosive atmosphere over the 51 years of the bridge's life” [6]. Experts saw that this corrosion was mostly due to water moisture from the nearby sea and the presence of chemicals such as sulphides and chlorides. Specifically, they found that “68% of the strands in the primary group, located inside the tie rod, and 85% of those located further out, showed a cross-section reduction [corrosion percentage] of between 50% and 100%” [7]. This corrosion is largely attributed to Morandi’s pre-stressed concrete system. Morandi had believed that this technique would protect the cables from corrosion and general wear and tear. However, due to possibly the sea and fumes from nearby factories, the concrete degraded severely, opening cracks that allowed moisture to penetrate and reach the cables. This also allowed the corrosion to worsen over time as it was hidden within the concrete [8].

Another cause is attributed to the bridge’s design. The sections of road in cable-stayed bridges extend from towers as cantilevers, and are supported by stays that traditionally extend from the top of each tower. These stays are essential to the bridge; without them, the roadway would require an impractical amount of support to avoid bending. Most modern bridges have several stays extending from each tower: the Governor Mario M. Cuomo Bridge (formerly known as the Tappan Zee bridge) that spans the Hudson River in New York City has “24 cables for each cantilevered roadway section,” whereas the Morandi bridge only had two. This missing redundancy means that if one cable ruptured, the remaining cables would not be sufficient to hold up the bridge, leading to a chain reaction of ruptures [9].

Maintenance History and Warning Signs

The Morandi bridge had a significant maintenance history, dating back to a few years after the bridge had first been constructed. In 1979, just 12 years after the bridge’s construction, Morandi wrote a report expressing his knowledge of the bridge’s problems, citing issues such as “the effect of moving loads and of environmental action, especially on flooring, load-bearing structures, joints, and finishes,” and “the chemical and mechanical effects of weathering on concrete and rebars” [7]. He also noted that the actual traffic on the bridge was significantly higher than estimates used in design. Since then, significant maintenance has taken place on the bridge, including the fitting of additional cables to Pillar 11 in 1992. During this event, workers found a construction defect where the pre-stressed concrete did not fully encase the steel cables at the top of the pillar, leading to 30% corrosion. However, Pillar 9, which ultimately collapsed, and Pillar 10 did not undergo similar maintenance efforts at the time despite the warning signs. Follow-ups on this issue were neglected, and little testing of the pre-stressed cables occurred in the future. In fact, a system to monitor the cables’ state was installed but was not replaced after it stopped working in 1996 [7].

Pillar 9 had warning signs before the collapse. In October 2017, 10 months before the collapse, Milan's Polytechnic University performed an analysis where they “identified an ‘anomaly’ in the way the corroded stays responded to vibrations caused by traffic, wind and other phenomena” [10]. However, they concluded that this was not sufficient proof as to whether the bridge could collapse. In February 2018, six months before the collapse, experts published another report stating that the stays had corroded up to 20%, and “[gave] their blessing to Autostrade's [company operating the bridge] plan to repair and bolster the viaduct.” However, ministry officials did not restrict bridge traffic, stating that this level of corrosion did not necessitate it [10].

Determining Responsibility

The collapse of the Morandi Bridge immediately triggered a debate regarding the management of public infrastructure by private entities. The bridge was operated by Autostrade per l'Italia, or ASPI, a private toll motorway management company [11]. While the Italian Ministry of Infrastructure and Transport was technically responsible for oversight, the operational control lay firmly with ASPI. Almost immediately, the government accused ASPI of negligence, threatening to revoke their concession. Prosecutors alleged that the company had prioritized shareholder dividends over safety by ignoring warning signs and avoiding necessary maintenance for the bridge [6].

Investigations unearthed evidence suggesting that the company’s faults went beyond simple neglect. Inquiries revealed that safety reports regarding the bridge’s condition may have been falsified or ‘softened’ to avoid costly repairs and disruptive lane closures. Specifically, technicians from SPEA Engineering, a subsidiary responsible for inspections, were accused of ignoring the increasingly evident risk of the bridge’s collapse and failing to take appropriate corrective actions [12]. The legal fallout resulted in a massive trial involving 59 defendants, including former executives of ASPI and officials from the transport ministry. The defendants faced charges ranging from manslaughter to making false official statements [13].

Aftermath

Following the disaster, the Italian government focused on clearing the site and reconnecting the severed city. In June 2019, the remaining towers of the Morandi Bridge were demolished using controlled explosives [14]. A reconstruction project was later awarded to two Italian industrial firms, led by renowned architect and Genoa native Renzo Piano. Constructed in record time, the Genova San Giorgio Bridge was inaugurated in August 2020, less than two years after the collapse. Unlike its predecessor, the new structure is embedded with robotic sensors for constant structural health monitoring, ensuring that the condition of the bridge is transparent at all times [15].

Professional Ethics

The Morandi Bridge collapse serves as a grim case study on the ethical perils of privatizing critical public infrastructure. The central failure lies in the conflict of interest between public safety and private profit. Engineers and managers within ASPI possessed data indicating potential instability in the bridge's stays years before the collapse, yet the organization failed to act with the urgency required by the legal and ethical principle of ‘Duty of Care’ [16].

This case also challenges the engineering community to re-evaluate how they manage older, ‘legacy’ structures, especially when their original designers have passed away and diffused their chief responsibility among different organizations. The Morandi Bridge was a technical masterpiece of its time, but its unique design choices became liabilities as the structure aged. The ethical takeaway is that transparency must never be compromised; when structural integrity is in question, the engineer’s obligation to human life must supersede commercial interests or the desire to preserve an engineering icon. This disaster emphasizes the need for honest, un-manipulated data in the surveillance of aging infrastructure.

References

• ↑ a b Glanz, James; Pianigiani, Gaia; White, Jeremy; Patanjali, Karthik (September 6, 2018). "Genoa Bridge Collapse: The Road to Tragedy". New York Times.
• ↑ Wikipedia Contributors (December 2, 2025). "Riccardo Morandi". Wikipedia.
• ↑ Pollock, Emily (August 22, 2018). "Italy's Morandi Bridge Collapse—What Do We Know?". engineering.com.
• ↑ Burlando, Massimiliano; Romanic, Djordje; Boni, Giorgio; Lagasio, Martina; Parodi, Antonio (November 25, 2019). "Investigation of the weather conditions during the collapse of the Morandi Bridge in Genoa on 14 August 2018" (PDF).
• ↑ BBC (August 19, 2018). "Italy bridge collapse: Genoa death toll rises to 43". BBC News.
• ↑ a b Landini, Francesca; Parodi, Emilio (April 22, 2021). "Italian prosecutors prepare possible charges based on Genoa bridge probe". Reuters.
• ↑ a b c Fumagalli, Monica (November 30, 2021). "The corrosion of the Morandi Bridge: the story of a predictable collapse?". ipcm.it.
• ↑ Today Staff (September 7, 2018). "Hanging by a thread: Behind a bridge collapse". TODAY.
• ↑ WRAL (August 16, 2018). "In Italy Bridge Collapse, Both Design and Upkeep Are Under Suspicion". WRAL.com.
• ↑ a b Bernabei, Stefano; Anzolin, Elisa; Za, Valentina (August 23, 2018). "Why no one thought to close Italy's crumbling bridge". Reuters.
• ↑ Autostrade per l'italia (2025). "About Us". autostrade.it.
• ↑ Al Jazeera (July 7, 2022). "Italy puts 59 people on trial for 2018 Genoa bridge collapse". Al Jazeera.
• ↑ Funk, Gabriella (July 7, 2022). "59 on Trial in 2018 Italy Bridge Collapse That Killed 43". Voice of America News.
• ↑ BBC (June 28, 2019). "Morandi Genoa bridge: Towers demolished after evacuations". BBC News.
• ↑ Sadlock, Joshua (February 7, 2022). "Genoa's San Giorgio Bridge Is a Technological Marvel". engineering.com.
• ↑ Brown, Rachael (August 21, 2018). "Morandi Bridge collapse raises questions about the safety of ageing infrastructure". createdigital.org.au.

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