Seismic spatial effects for long-span bridges, using the pseudo excitation method

Lin, J. H.; Zhang, Y. H.; Li, Q. S.; Williams, F.W.

doi:10.1016/j.engstruct.2004.03.019

Cited by 107 publications

(55 citation statements)

References 14 publications

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“…Then, different parts of the bridge may be subjected to signifi cantly different excitations with a complicated correlation of the motion at the support points. Hence, the spatial variation of the ground displacements and accelerations could play an important role in the determination of the structural response (Lin et al, 2004;Lin and Zhang, 2005;, as has been shown in recent earthquakes (Loma Prieta 1989, Northridge 1994, Hyogo-Ken Nanbu 1995. Therefore, it is extremely important to include the effects of spatial variation of the ground motion in the analysis, design and tuning of structural systems for the vibration control of seismic induced vibrations of long-span cable-supported bridges.…”

Section: Introductionmentioning

confidence: 96%

Ground motion spatial variability effects on seismic response control of cable-stayed bridges

Raheem

Hayashikawa

Dorka

2011

Earthq. Eng. Eng. Vib.

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The spatial variability of input ground motion at supporting foundations plays a key role in the structural response of cable-stayed bridges (CSBs); therefore, spatial variation effects should be included in the analysis and design of effective vibration control systems. The control of CSBs represents a challenging and unique problem, with many complexities in modeling, control design and implementation, since the control system should be designed not only to mitigate the dynamic component of the structural response but also to counteract the effects of the pseudo-static component of the response. The spatial variability effects on the feasibility and effi ciency of seismic control systems for the vibration control of CSBs are investigated in this paper. The assumption of uniform earthquake motion along the entire bridge may result in quantitative and qualitative differences in seismic response as compared with those produced by uniform motion at all supports. A systematic comparison of passive and active system performance in reducing the structural responses is performed, focusing on the effect of the spatially varying earthquake ground motion on the seismic response of a benchmark CSB model with different control strategies, and demonstrates the importance of accounting for the spatial variability of excitations.

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Section: Introductionmentioning

confidence: 96%

Ground motion spatial variability effects on seismic response control of cable-stayed bridges

Raheem

Hayashikawa

Dorka

2011

Earthq. Eng. Eng. Vib.

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“…Because the RVM requires extensive computation for the seismic analysis of high-pier railway bridges under tri-directional stochastic excitations, the pseudo-excitation method (PEM), proposed by Lin and also known as the fast complete quadratic combination method [10], was adopted in this paper to render the stochastic computation more efficient. The stationary stochastic excitation analyses and the non-stationary stochastic excitation analyses of structural systems with a large number of degrees of freedom and dozens of supports are then transformed, respectively and exactly, into harmonic analyses and deterministic transient ones using PEM to avoid multiple integral operations.…”

Section: Introductionmentioning

confidence: 99%

Analysis of a high-pier railway bridge under spatial stochastic stationary and non-stationary earthquake excitations

et al. 2016

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Original scientific paper The objectives of this paper are to perform a comparative analysis of the large-scale system of a high-pier railway bridge subjected to stationary and nonstationary spatially varying earthquake excitations using the pseudo-excitation method (PEM), and to estimate whether or not the non-stationary stochastic analysis of the high-pier railway bridges under tri-directional spatial ground motions can be simplified into a stationary random analysis to avoid excessive computation. Based on the finite element software ANSYS, the stationary and non-stationary stochastic excitations analyses of a high-pier bridge were transformed into harmonic analyses and deterministic transient analyses in the study, respectively, by using PEM. The wave-passage effect and the incoherence effect were modelled as the key factors, a total of twelve cases were considered to investigate the wave-passage effect and incoherence effect on the seismic response of a high-pier railway bridge under stationary and non-stationary earthquake excitations. Results show that structural responses under stationary excitation are larger than those under non-stationary by considering either the wave-passage effect or the incoherence effect. Through comparing structural responses under stationary excitation with those under non-stationary one, all the growth rates are less than 25 %, which is acceptable in engineering, meaning that a non-stationary stochastic analysis of high-pier railway bridges under tri-directional spatial ground motions can be simplified into a stationary analysis to avoid excessive computation.Keywords: high-pier railway bridge; incoherence effect; non-stationary stochastic excitation; pseudo-excitation method; wave-passage effect Analiza željezničkog mosta na visokim stupovima pod prostornim stohastičkim stacionarnim i ne-stacionarnim uzbudama potresaIzvorni znanstveni članak Ciljevi ovoga rada su provesti komparativnu analizu velikog sustava željezničkog mosta na visokim stupovima izloženog stacionarnim i ne-stacionarnim prostorno promjenjivim uzbudama potresa primjenom metode pseudo-uzbude (pseudo-excitation method -PEM), te procijeniti može li se ili ne može nestacionarna stohastička analiza željezničkih mostova na visokim stupovima izloženih trosmjernim prostornim podzemnim gibanjima zamijeniti jednostavnijom stacionarnom slučajnom analizom kako bi se izbjegla prekomjerna računanja. Zasnovane na ANSYS softveru konačnih elemenata, analize stacionarnih i ne-stacionarnih stohastičkih uzbuda mosta na visokim stupovima pretvorile su se u harmonične analize i determinističke prijelazne analize u našem istraživanju, primjenom PEM-a. Učinak prolaza vala i učinak nekoherentnosti modelirani su kao ključni čimbenici, a ukupno je razmotreno dvanaest slučajeva u svrhu ispitivanja učinka prolaza vala i učinka nekoherentnosti na seizmičku reakciju željezničkog mosta na visokim stupovima izloženog stacionarnim i ne-stacionarnim uzbudana potresa. Rezultati pokazuju da je reakcija konstrukcije pod stacionarnom uzbudom veća ...

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“…So considering the energy band principle of periodic structures, the seismic design and vibration control measures can be achieved by adjusting the structure itself, no other additional structures. At present, there are more seismic design methods about viaduct, such as: the response spectrum method [4,5], the earthquake time-history analysis [6,7] and random vibration method [8,9]. Above methods are generally to simplify viaduct as single degree of freedom system or multi-degree of freedom system, seismic wave simulated by standing wave, the corresponding vibration control equations obtained and solved.…”

Section: Introductionmentioning

confidence: 99%

Dynamic Response of a Period Viaduct In-plane Vibration Under Spatially Non-uniform Seismic Wave

Huang¹,

Sheng²,

Xu³

et al. 2015

Proceedings of the 5th International Conference on Civil Engineering and Transportation 2015

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By using the Floquet transform method and based on the periodic structure's theory, a theoretical model has been developed to determine the dynamic response of the periodic viaduct accounted for the non-uniform seismic excitations at different piers of the viaduct in this study. Numerical results show that there are three kinds of characteristic waves propagating in the periodic viaduct for the in-plane vibrations of the viaduct. The first kind of wave is a highly decaying wave; the second kind of wave can only propagate at a very narrow frequency range; the third kind of wave may propagate in pass bands with small attenuation. Moreover, when the periodic viaduct is subjected to passband seismic waves, the disturbance will propagate over a very long distance and the mode as well as attenuation of the wave motion far from the source is determined by the characteristic wave with the smallest attenuation. When the periodic viaduct is subjected to stopband seismic waves, the disturbance will restricted to the forced vibration region.

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Seismic spatial effects for long-span bridges, using the pseudo excitation method

Cited by 107 publications

References 14 publications

Ground motion spatial variability effects on seismic response control of cable-stayed bridges

Ground motion spatial variability effects on seismic response control of cable-stayed bridges

Analysis of a high-pier railway bridge under spatial stochastic stationary and non-stationary earthquake excitations

Dynamic Response of a Period Viaduct In-plane Vibration Under Spatially Non-uniform Seismic Wave

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