Undegraded Nonlinear Inelastic Shear Stress vs. Strain Characteristics for Soil Deposits at the Sites of Three Freeway Structures that Collapsed During the Earthquake

9416175 Henke该项目的目的是帮助提高国家的能力，工程高速公路结构，以抵御地震。 其主要目的是提供详细的信息，在原位未退化的非线性非弹性剪切应力与应变特性的土壤沉积物在网站的三个高速公路结构，在1994年北岭地震倒塌。 这些信息预计将对旨在确定土壤条件在塌陷中的作用的分析调查具有价值。 这些地点是I-5/14号高速公路交汇处，靠近伍德利的118号高速公路和位于拉谢内加的I-10号高速公路。 当地的土壤条件可能放大了这些地点的地面运动。 该项目的主要特点是，与试验有关的扰动对现场条件造成的不确定性预计将保持在相对较低的水平。 数据将使用现场原型简化原位扭转圆柱脉冲剪切试验系统进行测量，该系统目前正在为联邦公路管理局（FHwA）建造。该方法提供了详细的信息，原位未退化的非线性非弹性剪应力-应变特性的土壤沉积。 该方法解决了公知的，但尚未完全解决的问题，获得有关土壤特性的详细信息，而不会过度干扰原位条件。 这个问题可能会导致相当大的不确定性，在地震分析的结果。 该项目由FHwA共同资助。 ***

9416175 Henke The aim of this project is to help advance the Nation's ability to engineer freeway structures to resist earthquakes. The main objective is to provide detailed information on in situ undegraded nonlinear inelastic shear stress vs strain characteristics for the soil deposits at the sites of the three freeway structures that collapsed during the 1994 Northridge earthquake. The information is expected to be of value to analytical investigations aimed at identifying the roles of soil conditions in the collapses. The sites are the I-5/Highway 14 Interchange, Highway 118 close to Woodley, and I-10 at La Cienega. Local soil conditions may have amplified ground motions at these sites. The main feature of the project is that uncertainty caused by test- related disturbances to in situ conditions is expected to be held to a relatively low level. Data is to be measured using a field prototype simplified in situ torsional cylindrical impulse shear testing system currently being constructed for the Federal Highway administration (FHwA). This method provides detailed information on in situ undegraded nonlinear inelastic shear stress vs strain characteristic for soil deposits. The method addresses the well known, but not yet fully-resolved, problem of obtaining detailed information on the soil characteristics of interest without disturbing in situ conditions excessively. This problem can cause considerable uncertainty in the results of earthquake analyses. This project is being co-funded with the FHwA. ***