Earthquake-Induced Bridge Displacements
| 项目名称： | Earthquake-Induced Bridge Displacements |
| 摘要： | Most bridges respond inelastically to large seismic demand. However, seismic design using the AASHTO LRFD Bridge Design Specifications and the AASHTO Guide Specifications for LRFD Seismic Bridge Design methodologies relies on an elastic analysis to estimate the inelastic demands using the “equal displacement approximation.” The equal displacement approximation, introduced over 60 years ago, has not been fully validated. Advances in numerical and physical methods suggest that the equal displacement approximation underestimates the “real” seismic displacement demands. Consequently, bridges may not perform as intended when using the elastic analysis methods used for most designs. The potential underestimation associated with the AASHTO provisions was verified by the recently completed NCHRP Project 12-106, “Proposed Guidelines for Performance-Based Seismic Bridge Design.” Research is needed to examine the equal displacement approximation and, if necessary, develop simple, reliable adjustment factors that can modify the elastic displacement predictions to better match the “real” inelastic displacement response. The research outcome should provide the basis for design recommendations to better predict seismic demands resulting in safer and more reliable bridges. The objective of the research is to develop robust yet simple procedures for calculation of inelastic displacement demands in bridges subject to earthquake demands. |
| 状态： | Proposed |
| 资金： | 400000 |
| 资助组织： | National Cooperative Highway Research Program；American Association of State Highway and Transportation Officials (AASHTO)；Federal Highway Administration |
| 项目负责人： | Abu-Hawash, Ahmad |
| 开始时间： | 20221010 |
| 主题领域： | Bridges and other structures；Highways；Planning and Forecasting；Security and Emergencies |
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