A Rapid Seismic Vulnerability Assessment Tool for Bridges in Indiana - INSAT

The Indiana Seismic Assessment Tool (INSAT) is a rapid assessment seismic vulnerability assessment tool for bridges. INSAT is implemented in a macro-based Excel tool, and is designed to make direct use of NBI and BIAS data and data-structures.The parameters used in the analysis are tuned to bridges in Indiana, but the methodology could similarly be applied to bridges in other regions with low-to-moderate seismicity, such as the central and eastern US (see the JTRP report for details). As part of Joint Transportation Research Program (JTRP) project SPR-4222, supported by the Indiana Department of Transportation, INSAT was generated to perform the simplified assessment on the state-owned bridge inventory for a 1000-year ground acceleration (7% probability of exceedance in 75 years) based on the conditions at each specific bridge site. The simplified vulnerability assessment procedure and the vulnerability classification thresholds used in INSAT are determined based on a detailed analysis of representative set of bridges selected from across the Indiana inventory. INSAT is intended to be used to identify the most vulnerable bridges in a large bridge network, thus facilitating a rapid state bridge inventory network assessment to prioritize and inform actions such as maintenance and rehabilitation.Please watch the instructional video to see how INSAT functions, and then download the associated files to try it yourself. It does not run in the Data Depot environment.