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Synthesis of accelerograms compatible with the Chinese GB 50011-2001 design spectrum via harmonic wavelets: artifi cial and historic records

查看全文 作　　者：P.D. [1]Spanos;A. [2]Giaralis;Li [3]Jie 高影响力作者 机构地区：[1]Rice University, Houston, TX, 77005-1827, USA;[2]Department of Civil and Environmental Engineering, Rice University, Houston, TX, 77005-1827, USA;[3]Institute of Civil Engineering, Tongji University, Shanghai 200092, China高影响力机构 出　　处：《Earthquake Engineering and Engineering Vibration》索引2009年第8卷第2期,共18页高影响力期刊 摘　　要：A versatile approach is employed to generate artifi cial accelerograms which satisfy the compatibility criteria prescribed by the Chinese aseismic code provisions GB 50011-2001.In particular,a frequency dependent peak factor derived by means of appropriate Monte Carlo analyses is introduced to relate the GB 50011-2001 design spectrum to a parametrically defi ned evolutionary power spectrum(EPS).Special attention is given to the def inition of the frequency content of the EPS in order to accommodate the mathematical form of the aforementioned design spectrum.Further,a one-to-one relationship is established between the parameter controlling the time-varying intensity of the EPS and the effective strong ground motion duration.Subsequently,an effi cient auto-regressive moving-average(ARMA) fi ltering technique is utilized to generate ensembles of non-stationary artifi cial accelerograms whose average response spectrum is in a close agreement with the considered design spectrum.Furthermore,a harmonic wavelet based iterative scheme is adopted to modify these artifi cial signals so that a close matching of the signals' response spectra with the GB 50011-2001 design spectrum is achieved on an individual basis.This is also done for fi eld recorded accelerograms pertaining to the May,2008 Wenchuan seismic event.In the process,zero-phase high-pass f iltering is performed to accomplish proper baseline correction of the acquired spectrum compatible artifi cial and f ield accelerograms.Numerical results are given in a tabulated format to expedite their use in practice. 关 键 词：加速度反应谱 频谱兼容 谐波小波 设计谱 人工 GB 历史记录 频率依赖性
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