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Seismic behavior of underground structures and site response
Published in B.F. Spencer, Y.X. Hu, Earthquake Engineering Frontiers in the New Millennium, 2017
Hashash and Park (2000) introduce an extension of the model by Matasovic to account for the influence of confining pressure on soil modulus and damping properties. Hashash and Park (2001) show that confining pressure has an important impact in computed ground motion in a site response analysis. They show that significant portions of high frequency components of ground motion are propagated through deep soil deposits and that Propagation of seismic waves through very deep deposits result in the development of long period ground motion. Spectral amplitudes of propagated ground motions are higher than what would be obtained using conventional wave propagation analyses.
A Simplified Displacement Spectrum Model Based on Recent Digital Strong-Motion Data
Published in Journal of Earthquake Engineering, 2023
Longwei Chen, Xiaoyang Wu, Tingting Guo
Displacement spectrum models have been well developed by previous researchers (e.g. Bommer and Elnashai 1999; Faccioli, Paolucci, and Rey 2004; Tolis and Faccioli 1999). Some of the models have been accepted into engineering practice and seismic design codes (Bommer and Pinho 2006; Paolucci and Smerzini 2018). Their outstanding work definitely paves the way for the ongoing work layout and casts light on how to model displacement spectrum. By literature reviewing, the limitations of the current displacement spectrum models can be recapped as following. The early models used analog waveforms in which reliable period range was generally limited to 3.0 s or less (Paolucci et al. 2008); therefore, for longer structural periods of interest, the models are not applicable. The models that followed up extended period limit to 10 s and used digital strong motion data available worldwide. However, most datasets used to establish displacement spectral models were limited to moderate or intermediate (Mw < 6.5) earthquakes, e.g. in the pioneering work by Faccioli et al. (Faccioli, Paolucci, and Rey 2004), the database only contained the ChiChi earthquake (Mw= 7.6) whose magnitude exceeded 7.0. With global digital strong motion networks installation in recent decades, sources of high-quality seismic data to study long-period ground motion can be used. Furthermore, after completing the Chinese digital strong motion network (CSMNC), the digital strong-motion data from 2008 Wenchuan and 2013 Lushan earthquakes have been well archived. The records will be beneficial to improve modeling spectrum to meet seismic design practice in China.