Evaluation of Local Site Effects Using GIS, SCEC Geotechnical Database, and Nonlinear Site Response Model- 1994 Northridgequake

在评估城市地区强烈地震的社会经济影响时，对过去和未来损失的评估是最重要的。过去的地震表明，除了震源和路径的影响外，破坏模式还与当地的地质和岩土条件有关。调查的目的是利用北岭地震的经验来开发与当地土壤条件有关的损害估计和预测的创新方法。该方法基于现代地理信息系统（GIS）计算技术。研究的重点是非线性范围内土体放大引起的损伤。本研究包括以下内容：(1)完成强震影响区域的详细数字化岩土数据库；(2)修改非线性场地响应模型，以便与GIS集成；(3)将岩土数据库和非线性场地响应模型集成到GIS中，并自动计算非线性场地响应特征在该区域的分布；(4)将1和3的结果与记录的地表运动和破坏分布进行比较；(5)在这些比较的基础上开发用于估计和预测局部场地影响的GIS方法。结果将包括一系列数字化的地理信息系统数据库和相关的微分区图。它们是:(i)详细的三维岩土数据库，其中包含具有土壤分类特性、剪切波速和SPT结果随深度分布的数字化钻孔日志；（ii）不同深度的平均土壤特性、剪切波速和SPT结果的地图；（iii）根据剪切波速新标准进行场地分类的地图；（iv）用于一维非线性场地响应分析的近似设计曲线和参数数据库；(v)不同时期范围内土壤引起的放大图，以及（vi）一系列将记录的损害与上述图进行比较的图。＊＊＊

9416383 Vucetic The assessment of past and future damages are of primary importance in the evaluation of the socio-economic impact of strong earthquakes in urban areas. Past earthquakes have shown that, besides the source and path effects, damage patterns are associated with local geologic and geotechnical conditions. The objective of the investigation is to use the Northridge earthquake experience to develop innovative methods for the estimation and forecasting of the damages related to local soil conditions. The methods are based on modern GIS (Geographic Information System) computing technologies for microzoning. The primary focus is on the damage caused by soil amplification in the nonlinear range. The research includes the following components: (1) completion of a detailed digitized geotechnical data base for the region affected by strong shaking, (2) modification of the nonlinear site response model to allow for the integration into GIS, (3) integration of the geotechnical data base and nonlinear site response model into GIS, and automatic calculation of the distribution of nonlinear site response characteristics over the region, (4) comparisons of the results from 1 and 3 with recorded ground surface motions and damage distribution, and (5) development of the GIS methods for estimation and forecasting of local site effects based on these comparisons. The results will include a series of digitized GIS data bases and associated microzoning maps. They are: (i) a detailed 3-D geotechnical data base containing digitized boring logs with soil classification properties, shear wave velocity and SPT results distributed with depth, (ii) maps of average soil properties, shear wave velocities and SPT results for different depths, (iii) map of site classification according to new criteria on shear wave velocities, (iv) a data base of approximate design curves and parameters for 1-D nonlinear site response analyses, (v) maps of soil-induced amplification for different period ranges, and (vi) a series of maps comparing recorded damages and the maps listed above. ***