Executive Summary
An April 20 ASCE report argues that civil engineers are no longer dealing with temperature as a simple hot-versus-cold design input. Instead, they are confronting a more complex risk environment in which persistent heat, heavier snow and ice loading in some conditions, and faster hot-cold swings are affecting railroads, bridges, roads, power lines, and other infrastructure systems. ASCE frames the issue within a broader context of rising weather-related disruption, noting a 75% increase over the past decade in the number of people affected by extreme weather and direct global economic losses exceeding $200 billion annually. The core engineering message is that historical averages and single-variable checks are becoming less adequate, and that more climate-informed, data-driven, systems-level modeling is needed to protect asset performance, maintenance budgets, and public safety.
ASCE’s New Warning Is About Volatility, Not Heat Alone
The central development in the ASCE article is a shift in framing: temperature volatility is emerging as a design and resilience problem in its own right, not merely a background climate trend. The piece reports that engineers are reassessing how they design and maintain infrastructure because changing temperature patterns interact with other variables—such as moisture, snow, freezing rain, wind, and sunlight—to alter loads, damage mechanisms, and service-life expectations. In practical terms, that means roads, bridges, power systems, and rail infrastructure can no longer be evaluated solely against historical hot-and-cold averages if the underlying weather behavior is changing.
Railroads Show How Quickly Thermal Stress Turns Operational
Rail infrastructure provides the clearest near-term example in the ASCE report. Haizhong Wang of Clemson University says the Federal Railroad Administration recorded more than 600 buckling-related events in 2023, with nearly as many derailments, 16 fatalities, and about $320 million in reported damages. The mechanism is thermal buckling: as steel rails expand under high temperatures, tracks can warp laterally, compromising operations and safety. Wang adds that buckling risk rises sharply when steel reaches roughly 130-140°F, a threshold that is becoming more common in places such as Arizona and Texas. The article’s broader point is that extreme temperatures are no longer just a materials issue; they are a system-resilience issue for owners, operators, and regulators.
Winter Moisture Loads Make The Problem Multi-Hazard
The ASCE article also highlights why warming does not translate into heat impacts alone. Ahmed Abdelaal of SUNY Polytechnic Institute explains that as temperatures rise, the atmosphere can hold more moisture, which may produce heavier snow and freezing rain accumulation in winter rather than just heavier rainfall. For infrastructure such as power lines and roads, the engineering hazard is therefore not temperature in isolation, but temperature combined with accumulated load and, in some cases, wind. Abdelaal says engineers have long relied on historical temperature data and often assessed weather variables separately, but he is now working with the ASCE 7 working group to examine updated load requirements that consider multiple weather factors together.
Bridges Reveal The Damage Mechanism In Rapid Hot-Cold Swings
Bridges illustrate a different but equally important mechanism: thermal gradients. The ASCE report says the United States is experiencing more rapid shifts between hotter and colder temperatures, and Lauren Linderman of the University of Minnesota links those swings to cracking and defect risk in bridges. Using monitoring data from the Interstate 35W St. Anthony Falls Bridge, Linderman found that thermal loads were imposing greater demands than she expected, and follow-on work using climate-model-based temperature and sunlight projections indicated that uneven heating across a structure can create additional stress. The key point is that damage risk depends not only on absolute temperature but also on the temperature difference across the structure, which can accelerate cracking, slow degradation, shorten service life, and increase maintenance needs.
Better Models Are Now A Core Engineering Need
Across these case studies, the article returns to one conclusion: the modeling gap is becoming a resilience gap. Abdelaal says engineers need more accurate weather models and more research to understand how climate behavior is evolving, while Wang argues that infrastructure owners also need better systems-level tools because infrastructure networks are increasingly interconnected and failures can cascade across systems. Both researchers say that design and retrofit practice have depended too heavily on historical weather data, even as current conditions point to greater variability, more interactions among hazards, and greater uncertainty about future performance. The result is a growing need for projection-informed design, monitoring, and maintenance strategies rather than a simple extrapolation of the past.
The Immediate Takeaway Is To Design For Future Variability
The most important takeaway from the ASCE report is that temperature volatility is no longer a secondary planning issue. It is becoming a direct input into how engineers think about loading, cracking, deformation, maintenance, retrofit timing, and service-life reliability. The article does not suggest abandoning historical records, but it does make clear that relying on them alone is no longer sufficient for resilient infrastructure management. For news-first readers tracking the engineering implications of climate variability, the story is straightforward: future infrastructure performance will increasingly depend on how well design practice accounts for compound temperature effects, evolving load combinations, and the possibility of failures propagating across connected systems.
Frequently Asked Questions (FAQs)
- Why are historical temperature averages no longer enough? Because the ASCE article argues that the main engineering problem is no longer temperature alone, but rather temperature interacting with other variables such as snow, freezing rain, wind, and rapid hot-cold transitions. Historical averages may still be informative, but the article says they are not sufficient on their own when infrastructure is exposed to more variable, compound conditions.
- What is thermal buckling in rail infrastructure? Thermal buckling occurs when steel rails expand under high temperatures and deform laterally, creating unsafe track geometry. In the ASCE report, Wang says the Federal Railroad Administration recorded more than 600 buckling-related events in 2023, along with nearly as many derailments, 16 fatalities, and about $320 million in damages.
- Why can warming increase snow and ice loading risk? The article explains that warmer air can hold more moisture, which does not always fall as rain. In colder conditions, that extra moisture can contribute to heavier snow or freezing rain, increasing accumulated loads on exposed infrastructure such as power lines and roads.
- Why do thermal gradients matter for bridges? Thermal gradients matter because different parts of a bridge can heat and cool unevenly, creating internal stresses beyond those caused by uniform expansion or contraction alone. The ASCE article reports that Linderman’s work on the Interstate 35W St. Anthony Falls Bridge linked those gradients to greater structural demand and a higher potential for cracking and long-term degradation.
- What kind of modeling improvements are researchers calling for? The researchers featured by ASCE are calling for more accurate weather and climate models, more data on how temperature variability interacts with other hazards, and stronger systems-level modeling tools. Their goal is to improve the design, retrofitting, monitoring, and management of infrastructure increasingly exposed to interconnected failure risks.
(Source: Sukel, K. (2026, April 20). Volatile temperatures force civil engineers to rethink infrastructure design. Civil Engineering Source, American Society of Civil Engineers.)
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