Assessment of Performance of Modern Bridges in the 1999 Chi-Chi, Taiwan Earthquake

1999年9月21日的集集地震对整个台湾中部的交通系统造成了广泛的破坏和中断。震中地区的桥梁经历了剧烈的地面运动，在许多情况下有较大的断层偏移。对地震中的桥梁进行彻底的调查将有助于降低美国公路系统的地震风险。这两个国家使用类似的桥梁结构体系，与台湾一样，美国西部预计会出现大规模断层运动。该项目包括收集台湾受损和倒塌桥梁的数据，并对数据进行分析，以评估桥梁的性能。该项目的任务是：(1)记录桥梁的损坏情况；(2)将断层运动和强地震动记录与观测到的破坏联系起来；(3)建立桥梁非线性动力分析模型，评估桥梁的性能和损伤模式；(4)确定影响业绩的因素；(5)为美国桥梁抗震设计规范提出建议；(6)针对具体研究需求提出建议；(7)在报告和万维网上公布调查结果，包括访问数据库。特别值得调查的是1980年以后建造的桥梁，包括茂洛石高架桥和集陆斜拉桥。

The 21 September 1999 Chi-Chi earthquake caused widespread damage and disruption to the transportation system throughout central Taiwan. Bridges in the epicentral region experienced severe ground motion and in many cases large fault offset. The thorough investigation of bridges in the earthquake will help reduce the seismic risk of the highway system in the United States. The two countries use similar structural systems for bridges and, as in Taiwan, large fault movement is expected in the western U.S. This project involves collecting data on damaged and collapsed bridges in Taiwan and analyzing the data to evaluate bridge performance. The tasks of the project are to: (1) document damage of bridges; (2) correlate fault movement and strong ground motion records with observed damage; (3) develop models for nonlinear dynamic analysis of selected bridges to assess performance and damage modes; (4) identify the factors affecting performance; (5) develop recommendations for U.S. specifications for seismic design of bridges; (6) develop recommendations for specific research needs; (7) publish findings in a report and on the World Wide Web, including access to databases. Of particular interest for investigation are bridges built after 1980, including the Mao-loh-shi viaduct bridge and the Ji-lu cable-stayed bridge.