NEHRP Clearinghouse
- Title
- Earthquake Analysis and Response of Intake-Outlet Towers.
- File
- PB91229286.pdf
- Author(s)
- Goyal, A.; Chopra, A. K.
- Source
- National Science Foundation, Washington, DC., July 1989, 446 p.
- Identifying Number(s)
- UCB/EERC-89/04
- Abstract
- The available procedure for earthquake analysis of axisymmetric intake-outlet towers is extended to towers of arbitrary geometry, but with two axes of plan symmetry, and to include the effects of tower-foundation-soil interaction. For the time being, rigorous treatment of tower-foundation-soil interaction effects has been restricted to towers with a circular foundation supported near the surface of a viscoelastic halfspace. However, an approximate treatment of non-circular foundations is also included. A simplified procedure is developed to determine the maximum earthquake forces in intake-outlet towers directly from the design earthquake spectrum without the need for a response history analysis. All the significant effects of tower-water interaction and tower-foundation-soil interaction are included in the analysis. An equivalent single-degree-of-freedom system is developed to consider approximately the effects of tower-foundation-soil interaction in the fundamental mode response of towers, and standard data are presented to conveniently determine the effective natural period and damping of the interacting system.
- Keywords
- ; Finite element method; Towers; Seismic waves; Structural vibration; Mathematical models; Earth movements; Dynamic response; Earthquake engineering; Displacement; Soil-structure interactions; User manuals (Computer programs); Dams; Hydrodynamics; Earthquakes; Dynamic structural analysis