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SEISMIC EVALUATION OF TWO THIN ARCH DAMS

机译：两个薄拱坝的地震评估

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The Metropolitan Water District of Southern California (MWD) is currently conducting an overall evaluation of the seismic performance and safety of their dams and appurtenant structures. The evaluation is being conducted in phases, where dams of higher relative vulnerability to seismic loading have been identified. The current phase of study consists of limited field and laboratory investigations and simplified seismic analyses for select MWD dams. Two thin arch dams, Gene Wash and Copper Basin, are currently under evaluation in this phase of study.rnConstruction was completed on both dams in 1938. Upstream deformation and cracking was observed at both dams immediately after filling of each reservoir. Studies confirmed that Alkali-Aggregate Reaction (AAR) was occurring in the concrete of both dams and causing the upstream deformation. Monitoring data from the last 50 years suggests that the upstream expansion due to AAR have ceased or significantly declined (Hill, 1995).rnThe overall performance of each dam was evaluated with respect to earthquake induced vertical and horizontal deformations from the postulated design earthquake. The seismic performance evaluation, using three dimensional finite element analyses (3D FEA), included a parametric evaluation of material properties that considered a substantial reduction in the tensile strength of the concrete due to AAR. The evaluation also included an assessment of the potential dam and abutment instability during or following the design earthquake seismic event.rnThis paper will discuss the analysis methods, input parameters, results and conclusions drawn from the dam site reconnaissance, field data evaluation, and 3D FEA analyses.
机译：南加州大都会水区（MWD）目前正在对其坝和附属建筑物的抗震性能和安全性进行总体评估。评估正在分阶段进行，其中已经确定了对地震荷载具有较高相对脆弱性的大坝。目前的研究阶段包括有限的现场和实验室研究以及对MWD大坝的简化地震分析。在研究的这个阶段，目前正在评估两个薄拱坝，Gene Wash和CopperBasin。rn两个坝的建设于1938年完成。在每个水库填满水后，在两个坝上均观察到上游变形和裂缝。研究证实，在两座大坝的混凝土中均发生碱骨料反应（AAR），并引起上游变形。最近50年的监测数据表明，由于AAR引起的上游扩张已经停止或显着下降（Hill，1995）。rn评估了每个大坝的总体性能，以考虑假定设计地震引起的垂直和水平变形。使用三维有限元分析（3D FEA）进行的抗震性能评估包括对材料性能的参数评估，其中考虑了由于AAR导致混凝土抗拉强度的大幅降低。评估还包括对设计地震事件期间或之后潜在的大坝和基台失稳的评估。本文将讨论从大坝现场勘测，现场数据评估和3D FEA得出的分析方法，输入参数，结果和结论。分析。

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