Earthquake spectra and design pdf

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earthquake spectra and design pdf

( Newmark & Hall - EERI) Earthquake Spectra and Design | Earthquake Engineering | Earthquakes

Bijan Mohraz; A study of earthquake response spectra for different geological conditions. Bulletin of the Seismological Society of America ; 66 3 : — The current earthquake design spectra are based mainly on response spectra from recording stations located on alluvium deposits. A limited number of studies have shown that shape and the magnitude of response spectra for stations located on rock deposits are different from those located on alluvium deposits. This study examines the effects of geological conditions on the response spectra and the ground-motion parameters such as peak ground acceleration, velocity, and displacement. Design spectra are presented for various sites such as alluvium deposits, rock deposits, and alluvium layers underlain by rock deposits. The study shows that the current design spectra are too conservative for most structures located on competent rock deposits.
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Earthquake Ground Motion Analysis (Ground motion Spectra and Response Spectrum Analysis)

Earthquake Spectra and Design. Nathan M. Newmark and William J. Hall. People who bought this item also bought. Earthquake Design Criteria$

Response spectrum

A response spectrum is a plot of the peak or steady-state response displacement, velocity or acceleration of a series of oscillators of varying natural frequency , that are forced into motion by the same base vibration or shock. The resulting plot can then be used to pick off the response of any linear system, given its natural frequency of oscillation. One such use is in assessing the peak response of buildings to earthquakes. The science of strong ground motion may use some values from the ground response spectrum calculated from recordings of surface ground motion from seismographs for correlation with seismic damage. If the input used in calculating a response spectrum is steady-state periodic, then the steady-state result is recorded. Damping must be present, or else the response will be infinite.

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Richmond, California U. Newmark andW. Newmark and William J. Hall Published by The Earthquake Engineering Research Institute, whose objectives are the advancement of the science and prac- tice of earthquake engineering and the solution of na- tional earthquake engineering problems. The publication of this monograph was supported by a grant from the National Science Foundation. New- mark A long-time member of the Earthquake Engi- neering Research Institute, Professor Newmark was one of the pioneers in the field of earthquake engineering.

From the ground-motion recordings, were collected from the strong motion instrumentation network of Indian Institute of Technology, Roorkee that covers the Indian Himalayan range from Jammu and Kashmir to Meghalaya. Hence, for such structures, the intensity measures predicted by conventional ground-motion prediction equations need to be converted to a particular level of damping using a damping reduction factor DRF. In this study, the DRF has been defined using the spectral ordinate of pseudo-spectral acceleration and the effect of factors such as the duration of ground motion, magnitude, hypocenter distance, site classification, damping, and period are studied. In this study, an attempt has also been made to develop an empirical model for the DRF that is specifically applicable to the Himalayan region in terms of these predictor variables. A recorded earthquake with horizontal motions was used, with data characterized by magnitudes ranging from 4 to 7.

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  1. Leala P. says:

    Response spectrum - Wikipedia

  2. Hargaterri says:

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