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Kenneth Medearis`. Clearly ground vibrations with frequencies above 9 Hz will have less effect <br />on this type of structure than those with frequencies below 9 Hz. <br />Underdamped Single-Degree-of-Freedom Normalized Response <br />Spectrum for a Typical 2 Story Residential Structure <br />d <br />v <br />n <br />E <br />Q <br />c <br />0 <br />a <br />~= a <br />v <br />y <br />N <br />R; <br />O <br />2 <br />Frequency <br />• Figure 2 Response for a Typical Two-Story Structure <br />Structural response to vibrations may be controlled by modifying either the frequency of the <br />ground vibrations or the damping and fundamental frequency of the structure. Structural <br />response chazacteristics are typically modiSed during design phases to protect the integrity of the <br />structure during earthquakes. New construction model building codes from the Building Officials <br />& Code Administrators International, Inc. (BOCA) for this azea include minimum seismic design <br />protection, however adherence to these codes is generally not required for residential <br />construction. Older homes may have been constructed without regard to the effect of seismic <br />events. <br />1. Medearis, Kenneth, "The Development of Rational Damage Criteria for Low-Rise Structures <br />Subjected to Blasting Vibrations", in Proceedings of the 18th U.S. Symposium on Rock <br />Mechanics, 1977. <br />11 <br />m <br />5 10 15 20 25 30 35 40 <br />