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Evaluation of Comprehensive Seismic Design of Bridges (LRFD) in Illinois. Final rept.
| 题名： | Evaluation of Comprehensive Seismic Design of Bridges (LRFD) in Illinois. Final rept. |
| 作者： | ARJOMANDNIA, N.; BILLER, J.; CROSS, W. B.; EMAMI, B.; IVANOV, G.; PANAHSHAHI, N. |
| 关键词： | *Illinois-; *Highway-bridges; *Seismic-design.;Specifications-; Bridge-design; Evaluation-; Cost-analysis; Comparative-evaluations; Ground-motion; Seismic-engineering. |
| 摘要： | This report provides the Illinois Department of Transportation (IDOT) with data to assess the impact of the Recommended LRFD Guidelines for Seismic Design of Highway Bridges developed by a joint venture between the Applied Technical Council (ATC) and the Multidisciplinary Center for Earthquake Engineering Research (MCCER) based on a study initiated by the National Cooperative Highway Research Program in 1998 (NCHRP Project 12-49). Substructures of four southern Illinois bridges with Seismic Performance Categories (SPC) of 'B' and 'C' are designed for earthquake loads using the proposed NCHRP Specification and the AASHTO Standard Specifications for Highway Bridges (1996). It is also noted that for comparison purposes in all Illinois bridges investigated, similar earthquake resisting systems were used in the NCHRP design as in the AASHTO design, as requested by the project Technical Review Panel. Also, Operational performance objective was specified for the NCHRP design. The results of analysis and design of the first three Illinois bridges using both the AASHTO and the proposed NCHRP specifications and the corresponding cost impact analysis are presented. It is observed that the total construction cost of the interior bents designed using the proposed NCHRP Specifications were 1.96 to 5.43 times higher than the cost obtained using the AASHTO Specifications. To evaluate the realism of the NCHRP design spectrum for the southern Illinois region, a ground motion study is conducted at all four bridge sites where the spectral accelerations are determined and are compared with the corresponding USGS map values (1996). Comparison of the ground motion accelerations obtained in this study with the ones obtained from the USGS maps (1996) indicates that they are comparable when a 2500-year return period is considered. |
| 报告类型： | 科技报告 |
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