Abstract
Abstract A seismic risk analysis procedure previously developed for ground acceleration calculations of Taiwan is extended for ground velocity determination. The procedure is particularly suitable for Taiwan and other areas, where only limited information on seismicity is available. A velocity attenuation formula is established and used for risk calculation. This attenuation is consistent with an acceleration attenuation law of Taiwan. The resulting velocity risk map can be used in conjunction with an acceleration risk map produced before to serve as a basis for elastic design response spectrum construction. A risk level is chosen for building design. This level corresponds to a probability of ten percent for the design earthquake motion parameters being exceeded in a time span of fifty years. A form of elastic design spectrum and an equivalent lateral force coefficient are suggested as an application of the risk maps developed.
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