The Whittier Narrows Earthquake Freeway Bridges: Performance, Analysis and Repair

1987年10月1日惠蒂尔海峡地震对高速公路桥梁的破坏是地震侧向荷载下工程结构破坏的最重要方面之一。尤其重要的是I-605/I-5分隔线的性能，它在地震中严重受损，在高速公路交通最繁忙、人员伤亡最惨重的时候，它险些坍塌。该研究项目旨在研究高速公路桥梁在惠蒂尔海峡地震中的性能。研究包括五个阶段：观察损伤评估、构件强度和变形分析、选定桥梁结构的动力分析、评估评估建议和改造优先级。研究的目的是通过提高对现有桥梁结构对地震损伤的易损性的理解，对桥梁结构地震反应分析的分析技术进行校准和评估，从地震中桥梁损伤所强调的教训中获得最大的收益。并对降低高速公路桥梁地震风险的加固技术进行了开发和评估。

Damage to the freeway bridges in the Whittier Narrows earthquake of October 1, 1987 was one of the most significant aspects of damage to engineered structures designed for seismic lateral loads. Of particular importance was the performance of the I-605/I-5 separator, which was extensively damaged during the earthquake and came perilously close to collapse at a time when freeway traffic was at its heaviest and loss of life would have been extensive. The research project is directed to a study of the performance of freeway bridges in the Whittier Narrows earthquake. The research involves five stages: observed damage assessment, component strength and deformation analysis, dynamic analysis of selected bridge structures, recommendations on assessment and evaluation and prioritization for retrofitting. The intention of the research is to obtain maximum benefit from the lessons emphasized by bridge damage in the earthquake in the form of improved understanding of the vulnerability of existing bridge structures to seismic damage, calibration and assessment of analytical techniques for analysis of seismic response of bridge structures, and in the development and assessment of retrofit techniques to reduce the seismic risk of freeway bridges.