Approximate analysis method for statistical properties of seismic response

Book · Sun Dec 31 04:00:00 EST 1995

OSTI ID:170356

Aoki, Shigeru ^[1]

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1. Tokyo Metropolitan College of Technology, Tokyo (Japan). Dept. of Mechanical Engineering

When a system is subjected to earthquake excitations, the response of the system is a nonstationary random process. For analysis of statistical properties of such a response, stationary approximation is sometimes used for simplicity. In this paper, the effectiveness of a stationary approximation method is examined. As input excitation, nonstationary white noise, which is given by multiplying stationary white noise by envelope function, is used. For the statistical properties, the mean square response and the first excursion probability are obtained. In stationary approximation, mean square response is defined by multiplying stationary mean square response by the square of envelope function. Results are compared with those obtained by the nonstationary analysis method. It is concluded that the integral of mean square response with respect to time obtained by stationary approximation is equal to that obtained by nonstationary analysis independent of damping ratio and natural period.

• OSTI ID: 170356
• Report Number(s): CONF-950740--; ISBN 0-7918-1343-6
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
CALCULATION METHODS
COMPARATIVE EVALUATIONS
EQUATIONS OF MOTION
MATHEMATICAL MODELS
MECHANICAL STRUCTURES
MECHANICAL VIBRATIONS
NUMERICAL DATA
PROBABILITY
RESPONSE FUNCTIONS
SEISMIC EFFECTS
STRESS ANALYSIS