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Spatial Analysis of Benefits of Site-Specific Ground Motion Response Analysis
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2021-03-01
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[PDF-41.78 MB]
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Edition:Final Report (07/19-03/21)
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Abstract:The general procedure of the American Association of State Highway and Transportation Officials (AASHTO) LRFD Bridge Design Specifications, or AASHTO Guide Specifications for Load and Resistance Factor Design (LRFD) Seismic Bridge Design is sufficient to determine seismic hazard and site response. However, it is appropriate and may be necessary to perform site-specific hazard analyses for cases involving special aspects of seismic hazard such as long duration earthquakes, critical or essential bridges, specific soil site classes, and near-fault conditions. The result of site-specific hazard analyses may be used as justification for a reduction in the spectral acceleration determined from the general procedure representing the uniform seismic hazard. The results from TRC1603 (Wood et al. 2019) and results from MBTC3032 (Cox et al. 2012) indicate that seismic demands can be reduced in portions of Arkansas by conducting a site-specific ground motion response analysis (SSGMRA). The purpose of this study is to develop a series of Geographic Information System (GIS) maps that can be used by the Arkansas Department of Transportation (ARDOT) engineers and planners to determine when site-specific ground motion response analysis (SSGMRA) should be conducted. This project also provides information about possible cost savings if an SSGMRA is performed. To achieve this goal, this research is built upon the work completed in TRC1603 and included obtaining shear-wave velocity (Vs) profiles for 20 sites. These 20 sites will be in addition to 15 surveyed sites included in the TRC1603 project and 16 sites surveyed in the TRC0803 project (Elsayed et al., 2008).
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