Tennessee Tests New Bridge Beams to Withstand Strikes
Researchers are using a custom drop tower to evaluate beam durability and reduce repair costs for the state’s aging infrastructure.
Updated on Oct. 21, 2026 in Physics
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University of Tennessee researchers have utilized a custom-built drop tower to test new bridge beam designs against simulated vehicle impacts. The research, which evaluates structural resilience for Tennessee infrastructure, focuses on mitigating damage from recurring vehicle strikes.
Why it matters
Older bridge support beams are vulnerable to structural degradation and steel corrosion when struck by modern vehicles. By developing more robust designs, the team aims to provide the Tennessee Department of Transportation with cost-effective methods to improve the durability of the state's 20,000 bridges.
The testing facility features a drop tower capable of releasing 1,500-pound weights from heights up to 12 feet to simulate impact loads. Researchers utilized these experiments to inform simulation models derived from inspections of 40 bridges across Tennessee.
The players
University of Tennessee
A public research institution focused on civil engineering and infrastructure resilience testing.
Tennessee Department of Transportation
The state agency responsible for the maintenance and safety of Tennessee's 20,000 bridges.
Federal Highway Administration
A federal agency that supports state-level research and infrastructure safety programs.
Ross Prestressed Concrete Inc.
A concrete manufacturer that produced the three experimental beam designs for structural testing.
The details
Researchers position bridge beam samples beneath the tower, which utilizes a controlled release mechanism and secondary support chains for testing safety. By simulating direct impacts, the team analyzes how various beam geometries perform under stress compared to current standards. These designs aim to prevent the structural compromise that exposes steel to corrosion following a crash, an issue underscored by a Memphis bridge that required repairs after 13 separate strikes.
Timeline
Over the past year, researchers conducted design reviews and constructed the drop tower.
The project reached current operational status as of October 20, 2026.
The Tech Race
This project moves beyond standard bridge inspections to create a predictive model for infrastructure durability in Tennessee. It follows the precedent set by current state maintenance programs, seeking to replace reactive repair cycles with impact-resistant engineering designs.
Drivers in Tennessee may see more durable bridge designs incorporated into future infrastructure repairs as the state evaluates these findings. The ultimate implementation of these beams depends on adoption by the Tennessee Department of Transportation.
The takeaway
The research team aims to convince the Tennessee Department of Transportation to adopt these new beams for statewide implementation. Readers should watch for updates on the Tennessee Department of Transportation's upcoming infrastructure repair contracts to see if the new designs are deployed.
Further reading
Explore more developments in structural engineering and material stress testing in Physics.
Source note: This article includes information reported by Tech Xplore.
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