Data Center Infrastructure Study Validates Seismic Cables Guidelines, Proposes Simple Wire Upgrades

A research collaboration involving Meijo University, the Tokyo Institute of Technology, Tongji University, and Japanese hardware manufacturer Negurosu Denko Co. has completed full-scale seismic testing on suspended cable tray systems, revealing key vulnerabilities in critical building infrastructure and proposing a low-cost reinforcement mechanism to prevent outages during major earthquakes.

Cable tray systems form the backbone of physical building infrastructure, carrying vital power cables and fiber-optic communication lines throughout enterprise facilities, data centers, hospitals, airports, and industrial complexes. Interruptions caused by structural failure during seismic events pose severe risks to operational continuity and public safety by severing power distribution and network connections across mission-critical systems.

The research initiative, detailed in the journal Engineering Structures, was prompted by systemic issues observed during the 2011 Great East Japan Earthquake. Although primary building frames largely maintained structural integrity during that disaster, widespread damage to nonstructural building services—including cable distribution networks—caused major operational disruptions. Existing Japanese seismic design standards for suspended cable trays had not previously undergone rigorous full-scale experimental verification.

To address these knowledge gaps, a team led by Professor Kazuhiro Matsuda from Meijo University's Department of Architecture, alongside Eisaku Asatsuma of Negurosu Denko Co., Professor Kazuhiko Kasai of the Tokyo Institute of Technology, and Professor Huanjun Jiang of Tongji University, conducted comprehensive shaking table experiments. The researchers constructed full-scale suspended cable tray setups spanning more than 10 meters (33 feet) in length, subjecting them to simulated earthquake motions of increasing intensity while performing additional mechanical load assessments on individual components.

The experimental results demonstrated that while primary seismic support brackets met required design strength thresholds and sustained minimal damage, the cable trays themselves suffered extensive deformation under violent shaking. The structural tray bodies, rather than their ceiling support mechanisms, proved to be the primary point of failure within the overall system.

"Our experiments confirmed that the seismic support members possess sufficient strength, but the cable trays themselves can become the critical point of failure during severe earthquakes," Matsuda explained, noting that "improving the performance of the tray components, rather than the support structures alone, is essential for enhancing the resilience of building services."

To solve the failure issue without introducing heavy or expensive modifications, the researchers designed a simple reinforcement framework using strategically installed steel wires. The lightweight wire mechanism increases the rigid resistance of the cable trays while remaining inexpensive and straightforward to deploy across building service layouts.

Laboratory testing confirmed that cable tray assemblies retrofitted with the steel-wire system performed significantly better under seismic strain than unreinforced standard configurations. Because the reinforcement requires only steel wire and standard mounting steps, facility engineers can implement the design both in new commercial real estate projects and as a retrofit within existing enterprise data centers and industrial plants.

The findings, first reported by TechXplore, highlight an accessible engineering strategy for enterprise infrastructure managers seeking to protect high-density wiring systems and maintain uninterrupted network operations following severe seismic events.