Dynamic Analysis of Existing Tarbela Intake Towersby Paul C. Chao, TAMS, Tarbela Dam Project, New York, NY, USA,
Abraham Z. Ephros, TAMS, Tarbela Dam Project, New York, NY, USA,
Jacques E. Benveniste, TAMS, Tarbela Dam Project, New York, NY, USA,
Liisa K. T. Panula, TAMS, Tarbela Dam Project, New York, NY, USA,
Abstract: According to general practice at the time of the design, the pseudostatic method of applying earthquake loading was used. The basic acceleration was 0. 1g. A post-construction seismological study was made and peak accelerations ranging from 0. 35g to 0. 65g were adopted for the dynamic reanalysis of the main project structures. Elastic linear frame analyses using a Design Basis Earthquake indicated possible significant damage to the power intake towers. An improved dynamic response could be obtained by removing the steel tower, concrete shroud and hemispherical bulkhead with its hoisting machinery; all features no longer functionally necessary. The work has been approved for construction and will be done in the dry season when the pool level is low, with very little consequent loss of power.
Subject Headings: Dynamic analysis | Elastic analysis | Earthquake resistant structures | Dynamic structural analysis | Power plants | Earthquakes | Hydro power | Seismic design | Asia | Pakistan
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