NEHRP Clearinghouse
- Title
- Seismic Response of Structural System with Randon Parameters.
- File
- PB82150764.pdf
- Author(s)
- Ghafory-Ashtiany, M.; Singh, M. P.
- Source
- National Science Foundation, Washington, DC. Office of Planning and Resources Management., September 1981, 108 p.
- Abstract
- The effects of changes in various structural parameters on the response of a structure excited by random ground excitation are studied. The random parameters considered are the structural mass, stiffness, and eccentricity between mass and stiffness centers on a floor. The variabilities in the mass and stiffness are characterized by the random variables with the mean values equal to 1.0 and known standard deviations. This assumes that all masses and stiffnesses vary in the same proportion. A uniform multistory building with eccentric mass and stiffness center is studied. The rates of change of frequencies and various response quantities with respect to mass, stiffness, and eccentricity parameters are obtained. These rates of change indicate the sensitivity of a quantity with respect to a parameter and emphasize the relative importance of that parameter for that response. These rates are also used in the calculation of response coefficient of variation for given coefficient of variation values of the parameters. Numerical results are obtained for a five-story, 10-degrees-of-freedom structural system with various damping ratio and frequency parameter values.
- Keywords
- Earthquake resistant structures; Dynamic response; Buildings; Earthquake engineering; Random vibration; Random variables; Dynamic structural analysis