Structural Walls in Earthquake-Resistant Buildings. Dynamic Analysis of Isolated Structural Walls. Input Motions.

摘要

A characterization of input motions for use in dynamic analysis is given in terms of intensity,duration and frequency content. Different measures of intensity are examined. On the basis of this examination,spectrum intensity is selected as a good measure of ground motion intensity. A review of the work of other investigators shows that a 20-second duration of strong ground motion is generally adequate for determining maximum cumulative deformation estimates of maximum response quantities other than cumulative deformations. Estimates of maximum response may be obtained using 10seconds of strong ground motion. Accelerograms are classified with respect to frequency content as 'peaking'or 'broad band',depending upon the character of the associated 5%-damped relative velocity response spectra.