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Structural Engineering and Mechanics
  Volume 36, Number 3, October20 2010, pages 321-341
DOI: http://dx.doi.org/10.12989/sem.2010.36.3.321
 


Development of a nonlinear seismic response capacity spectrum method for intake towers of dams
Leonardo Cocco, Luis E. Suarez and Enrique E. Matheu

 
Abstract
    The seismic-induced failure of a dam could have catastrophic consequences associated with the sudden release of the impounded reservoir. Depending on the severity of the seismic hazard, the characteristics and size of the dam-reservoir system, preventing such a failure scenario could be a problem of critical importance. In many cases, the release of water is controlled through a reinforced-concrete intake tower. This paper describes the application of a static nonlinear procedure known as the Capacity Spectrum Method (CSM) to evaluate the structural integrity of intake towers subject to seismic ground motion. Three variants of the CSM are considered: a multimodal pushover scheme, which uses the idea proposed by Chopra and Goel (2002); an adaptive pushover variant, in which the change in the stiffness of the structure is considered; and a combination of both approaches. The effects caused by the water surrounding the intake tower, as well as any water contained inside the hollow structure, are accounted for by added hydrodynamic masses. A typical structure is used as a case study, and the accuracy of the CSM analyses is assessed with time history analyses performed using commercial and structural analysis programs developed in Matlab.
 
Key Words
    intake towers; capacity spectrum method; dams; nonlinear static analysis; seismic behavior.
 
Address
Leonardo Cocco: Department of Structures, School of Engineering, National University of Cordoba, Cordoba 5000, Argentina
Luis E. Suarez: Department of Civil Engineering and Surveying, University of Puerto Rico, Mayaguez, Puerto Rico 00681-9000
Enrique E. Matheu: Office of Infrastructure Protection, US Department of Homeland Security, Arlington, Virginia 22201, USA
 

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