NEHRP Clearinghouse
- Title
- Theoretical Study on Earthquake Response of a Reinforced Concrete Chimney.
- File
- PB274820.pdf
- Author(s)
- Yang, T. Y.; Shiau, L. C.; Lo, H.
- Source
- National Science Foundation, Washington, D.C. Research Applied to National Needs., June 3, 1976, 96 p.
- Abstract
- A detailed dynamic analysis, presented in a series of reports, was conducted on the seismic response and structural safety of key subsystems (steam generator, high pressure steam piping, coal handling equipment, cooling tower, chimney) of Unit no. 3 of TVA at Paradise, Kentucky in order to: (1) determine for the key components the natural frequencies below 50 Hz and the corresponding normal modes; (2) determine response of plant to seismic disturbances; (3) verify through full scale tests results obtained in (1) and determine estimates of damping needed in (2); (4) determine potential failure modes of major structural components; and (5) determine a spare parts policy for a power system so that outages due to damage from seismic disturbances are minimal. Analytical and experimental methods are used. Here, the chimney is modeled and its dynamic responses analyzed by modal superposition. Three assumed values of damping coefficients are applied to its two reinforced concrete shells, yielding data for various stress areas after application of 1940 El Centro earthquake parameters. Stress distribution around flue openings at the worst time is determined from quadrilateral sheet finite element data.
- Keywords
- Chimneys; Earthquake resistant structures; Stress concentration; Seismic waves; Earth movements; Finite element analysis; Ground motion; Earthquake engineering; Kentucky; Thermal power plants; Paradise (Kentucky); Earthquakes; Dynamic structural analysis