Methods used for the treatment of non-proportionally damped structural systems

Technical Report · Sat May 01 04:00:00 EDT 1993

DOI:https://doi.org/10.2172/10165506· OSTI ID:10165506

Conoscente, J P; Maslenikov, O R; Johnson, J J ^[1]

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1. EQE Engineering Consultants, San Francisco, CA (United States)

Non-proportional or non-classical damping is defined as a form of viscous damping that introduces coupling between the undamped modal coordinates of motion. Such problems have practical applications in the dynamic analysis of soil-structure systems, structure-equipment systems, and structural systems made of materials with different energy dissipation capacities, which is applicable to seismic analysis of nuclear power plants. Presented in this report is a review of the methods most commonly used in structural analysis for the solution of the dynamic response of systems with non-proportional damping. Both rigorous and approximate methods are described. Since rigorous methods usually require large computational efforts, approximate methods using undamped mode shapes are often preferred. In the study described here, the accuracy of three approximate methods was evaluated for three benchmark problems, with various parametric variations. Results were compared with the exact solution for different combinations of structural properties. Based on these results, conclusions and recommendations are presented for the use of the selected approximate methods.

• Research Organization: Nuclear Regulatory Commission, Washington, DC (United States). Div. of Engineering; EQE Engineering Consultants, San Francisco, CA (United States)
• Sponsoring Organization: Nuclear Regulatory Commission, Washington, DC (United States)
• OSTI ID: 10165506
• Report Number(s): NUREG/CR--6013; ON: TI93015048
• Country of Publication: United States
• Language: English

Related Subjects

22 GENERAL STUDIES OF NUCLEAR REACTORS
220200
220900
ACCURACY
BENCHMARKS
BUILDINGS
CALCULATION METHODS
COMPARATIVE EVALUATIONS
COMPONENTS AND ACCESSORIES
DAMPING
ENERGY LOSSES
MECHANICAL STRUCTURES
MECHANICAL VIBRATIONS
NUCLEAR POWER PLANTS
PARAMETRIC ANALYSIS
PIPES
REACTOR SAFETY
SEISMIC EFFECTS
SOIL-STRUCTURE INTERACTIONS