NEHRP Clearinghouse
- Title
- Simple Continuum Model for Dynamic Analysis of Complex Plane Frame Structures.
- File
- PB274926.pdf
- Author(s)
- Sun, C. T.; Lo, H.; Cheng, N. C.; Bogdanoff, J. L.
- Source
- National Science Foundation, Washington, D.C. Research Applied to National Needs., June 3, 1976, 30 p.
- Abstract
- A detailed dynamic analysis, reported in this series, 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. This volume includes discussion of a simple model developed for dynamic analysis of large frame structures that can account both for joint rotation and axial deformation. The governing equations are derived from a continuum theory for gridworks. Natural frequencies are computed by using the simple model and by finite element method. Comparisons of the solutions show that the simple model yields reasonable solutions for the first five modes.
- Keywords
- Earthquake resistant structures; Framed structures; Seismic waves; Earth movements; Finite element analysis; Ground motion; Earthquake engineering; Kentucky; Steam electric power generation; Paradise (Kentucky); Earthquakes; Dynamic structural analysis