Development and Utilization of Usgs Shakecast for Rapid Post-Earthquake Assessment of Critical Facilities and Infrastructure

Abstract eng:
The ShakeCast system is an openly available near–real-time post-earthquake information management system. ShakeCast is employed by public and private emergency responders, lifeline operators, and facility engineers to automatically receive and process ShakeMap products for situational awareness, inspection priority, or damage assessment. The success of ShakeCast and its critical-user base mandates improved software usability and functionality. In an effort to make the software more accessible to novice users we have developed a “ShakeCast Workbook,” a well-documented Excel-spreadsheet-based user interface that allows users to input notification and inventory data and export files needed for operating the ShakeCast system. Users will be able to select structure fragilities based on a minimum set of user-specified facility data (building location, size, height, use, construction age). “Expert” users will be able to import user-modified structural response properties into the facility inventory associated with the HAZUS Advanced Engineering Building Modules (AEBM). The goal of the ShakeCast system is to provide simplified real-time potential impact and inspection metrics to allow users to institute customized earthquake response protocols. Previously, fragilities were approximated using individual ShakeMap intensity measures (IMs, specifically peak ground acceleration and 0.3- and 1.0-sec spectral accelerations) for each facility, but we are now performing capacity-spectrum-based damage state calculations using a more robust characterization of spectral demand. We are also developing methods for the direct import of ShakeMap’s multi-period response spectra in lieu of the assumed three-domain design spectrum (at 0.3 sec for constant acceleration; 1.0 or 3.0 sec for constant velocity and constant displacement at very long response periods). As part of ongoing ShakeCast research and development, we will also explore the use of ShakeMap IM uncertainty estimates and evaluate the assumption of employing multiple damping values rather than the single value (5%) currently employed. Developing and incorporating advanced fragility assignments into the ShakeCast Workbook requires related software modifications and database improvements; these enhancements are part of an extensive rewrite of the ShakeCast application.

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