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Peak earthquake response of struc.ures under multi-c.mponent exc.tations

Earthquake Engineering and Engineering Vibration 2007年第4期6卷 357-370页

作者： jianwei song zach liang yi-lun chu george c. lee Department of c.vil Structural and Environmental Engineering State University of New York at Buffalo USA

Ac.urate estimation of the peak seismic.responses of struc.ures is important in earthquake resistant design. The internal forc. distributions and the seismic.responses of struc.ures are quite c.mplex, sinc. ground motions are multidirec.ional. One key issue is the unc.rtainty of the inc.dent angle between the direc.ions of ground motion and the referenc. axes of the struc.ure. Different assumed seismic.inc.denc.s c.n result in different peak values within the sc.pe of design spec.rum analysis for a given struc.ure and earthquake ground motion rec.rd c.mbination. Using time history analysis to determine the maximum struc.ural responses exc.ted by a given earthquake rec.rd requires repetitive c.lc.lations to determine the c.itic.l inc.dent angle. This paper presents a transformation approac. for relatively ac.urate and rapid determination of the maximum peak responses of a linear struc.ure subjec.ed to three-dimensional exc.tations within all possible seismic.inc.dent angles. The responses c.n be deformations, internal forc.s, strains and so on. An irregular building struc.ure model is established using SAP2000 program. Several typic.l earthquake rec.rds and an artific.al white noise are applied to the struc.ure model to illustrate the variation of the maximum struc.ural responses for different inc.dent angles. Numeric.l results show that for many struc.ural parameters, the variation c.n be greater than 100%. This method c.n be direc.ly applied to time history analysis of struc.ures using existing c.mputer software to determine the peak responses without c.rrying out the analyses for all possible inc.dent angles. It c.n also be used to verify and/or modify aseismic.designs by using response spec.rum analysis.

关键词： multi-c.mponent ground motion time history analysis peak struc.ural response axis rotation

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Estimation of peak relative veloc.ty and peak absolute ac.eleration of linear SDOF systems

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Earthquake Engineering and Engineering Vibration 2007年第2期6卷 1-10页

作者： jianwei song yi-lun chu zach liang george c. lee Department of c.vil Struc.ural and Environmental Engineering University at Buffalo State University of New York USA

In the seismic.analysis and design of struc.ures, the true veloc.ty and absolute ac.eleration are usually approximated by their c.rresponding pseudo-values. This approac. is simple and works well for struc.ures with small damping （say, less than 15%）. When the damping of a struc.ure is enhanc.d for the purpose of response reduc.ion, it may result in large analysis and design errors. Based on theory of random vibration and the established mec.anism of seismic.response spec.ra analysis, a method is developed （1） to predic. the relative veloc.ty spec.ra with any damping ratio level direc.ly from the 5% standard pseudo-ac.eleration spec.rum; and （2） to estimate the peak absolute ac.eleration. The ac.urac. of both is validated by using two selec.ed ensembles of ground motion rec.rds.

关键词： damping devic. veloc.ty spec.rum absolute ac.eleration spec.rum response spec.rum analysis

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