Post-earthquake bridge inspection guidelines

O'Connor, Jerome S. · 2010 · ROSA P / Multidisciplinary Center for Earthquake Engineering Research (U.S.)

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Summary

This report, produced by the Cornell Transportation Infrastructure Research Consortium for the New York State Department of Transportation (NYSDOT), establishes comprehensive guidelines for post-earthquake bridge inspection and response. The research addresses the critical need for a structured emergency protocol to assess highway bridge safety and functionality following seismic events. Although New York State is classified as having low-to-moderate seismic hazard, the high concentration of infrastructure and population in regions like New York City creates significant seismic risk. The motivation stems from the necessity to ensure public safety, maintain mobility for emergency services, and efficiently deploy resources to inspect potentially damaged structures, many of which were built before modern seismic design standards were implemented. The proposed Earthquake Response Plan (ERP) outlines a two-phase inspection process. The first phase involves immediate preliminary bridge damage assessments (PBDA) conducted by residency staff who drive pre-defined priority routes to identify obvious damage and erect barricades if necessary. The second phase consists of special post-earthquake bridge inspections (SPEBI) performed by specialized teams mobilized by the Regional Structures Engineer. To facilitate efficient resource allocation, the project developed a computer program that prioritizes inspections by calculating the distance from the earthquake epicenter to each bridge using GPS coordinates from the bridge inventory. The ERP defines four response levels based on earthquake magnitude (Mw); for magnitudes below 3.5, response is discretionary, while higher magnitudes trigger mandatory inspections within specific radii and potentially activate the Department’s Incident Command System. The report provides extensive technical guidance, including detailed reporting forms, process flowcharts, and photographic examples of potential damage types such as approach slab settlement, column spalling, bearing failure, and deck collapse. It categorizes damage severity to inform immediate actions, which may include bridge closure, traffic restriction, flagging, or repair. Additionally, the document offers strategies for repairing and retrofitting damaged bridges, such as using steel jackets or fiber-reinforced polymer composites. The guidelines also incorporate lessons from other state departments of transportation and include training exercises and resource lists to prepare staff for effective deployment. The significance of this work lies in its provision of a standardized, actionable framework for NYSDOT to manage seismic emergencies. By establishing clear lines of responsibility and prioritization tools, the plan ensures that damage assessments are conducted expeditiously and logically. This structured approach mitigates the risk of secondary disasters, such as aftershock-induced collapses, and supports the rapid restoration of the highway network. The report serves as a critical preparedness tool, transforming theoretical seismic risk into practical operational procedures for infrastructure management.

Key finding

The study provides a structured Earthquake Response Plan and prioritization software that enables the New York State Department of Transportation to systematically assess bridge damage and deploy inspection resources based on earthquake magnitude and proximity to the epicenter.

Methodology

other

Provenance

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