Response of Tied-Back Walls During the Whittier Narrows Earthquake of October 1, 1987

在地震期间， 这对维持紧急车辆的运输通道至关重要。 然而，很少有研究已经做了地震反应的系- 后墙 更重要的是，没有正式的程序， 回拉墙的抗震设计。 可能的失效模式为 通过计算机有限元研究确定：缺少的是 实际回拉墙性能的观察， 大地震的震动。 在惠蒂尔海峡地震期间， 建筑物挖掘-大多是临时的-受到温和的 地震震动 由于这些墙的临时性质， 信息在相对较短的时间内可用，之后， 数据丢失。 此外，挖掘现场的目击者 响应可以提供用于解释数据的信息。 本研究的目的是收集关于拉背墙的数据 在惠蒂尔海峡地震期间的反应，以比较 现场观察了拉背墙的性能， 数值分析的结果。 这将有助于验证分析 地震作用下挡土墙的性能和破坏模型 加载，这也将有助于确定对墙的依赖性 几何形状、土壤剖面、锚的位置、系紧荷载，以及 地面运动 每个病例的历史都被记录在足够的 详细信息，便于与数字进行比较 问题研究

Failure-proof performance of tied-back walls during earthquakes is critical to maintaining transportation corridors for emergency vehicles. Yet very little research has been done on the seismic response of tied- back walls. More importantly, there are no formalized procedures for the seismic design of tied-back walls. Possible failure modes have been identified through computer finite element studies: what is lacking is observation of the performance of actual tied-back walls during moderate to large earthquake shaking. During the Whittier Narrows earthquake, a number of tie-back walls for building excavations - mostly temporary - were subjected to moderate earthquake shaking. Because of temporary nature of these walls, the information is available for a relatively short time, after which the data is lost. In addition, eye witness accounts of the excavation response may provide information for interpreting the data. The objective of this research is to collect data on tied-back wall response during the Whittier Narrows earthquake in order to compare the field observation of the performance of the tied-back walls to the results of numerical analyses. This will help validate the analytical models for the performance and damage of tied-back walls to earthquake loading, and it will also help to determine the dependence on wall geometry, soil profile, location of the anchors, tieoff loads, and ground motion. Each case history is being documented in sufficient detail to facilitate comparison between sites with the numerical studies.