Analysis of Interstate 880 Failure in Oakland California Due to the October 17, 1989 Santa Cruz Mountains Earthquake

这是一个SGER项目，收集和研究1989年10月17日洛马普里塔地震的易损地震和结构反应/损坏数据。通过现场钻孔/检波器试验收集易腐场地土壤数据，通过现场样品的室内试验收集钢筋混凝土构件动力性能数据，并进行评价。土体阻尼、剪切模量和非线性土体应力-应变关系将被确定。利用土与混凝土的基本数据，对双层桥梁结构进行动力分析。加州运输部将提供桥址的设计蓝图和土壤测井图，以协助研究。这项工作将有助于更好地了解当地土壤对结构响应的影响，并提高对I-880高架桥桥梁结构破坏原因的理解。

This is a SGER project to collect and to study the perishable earthquake and structural response/damage data due to the October 17, 1989 Loma Prieta earthquake. Perishable site soil data by in-situ borehole/geophone experiments and dynamic property data of reinforced concrete members by laboratory tests of field samples will be collected, and evaluated. Soil damping, shear modules, and nonlinear soil stress-strain relationship will be determined. Using the basic data of soil and concrete, a dynamic analysis of the double deck bridge structures will be carried out. The California Department of Transportation will provide design blue prints and soil log charts of the bridge-sites to assist the study. The effort will lead to better understanding the effect of local soil to the structural response and improved understanding of failure causes of the bridge structures of the I-880 viaduct.