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Date of Publication:2011-01-01

Journal:世界地震工程

Volume:27

Issue:2

Page Number:93-99

ISSN No.:1007-6069

Abstract:Analysis of the floor spectrum is the main basis for seismic design of structures and equipments in nuclear power plants (NPP). There' re generally two groups of methods for the computation of floor spectrum. The first group includes the so-called direct methods, where the floor spectrum is calculated directly from response spectrum of input ground motion. While the second group includes time-history analysis methods, transient analysis is characterized with time-history input as excitation. Focusing on the first group, comments on several direct methods including the ones proposed by Biggs, Kapur and Singh have been made. Based on the work of Biggs and Kapur, a revised modal method is presented. Dynamic soil-structure interaction effect is taken into consideration in the modal method. The computation of the revised modal method can be easily taken out and the result obtained is highly accurate.

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