Multiple-station ground motion processing and simulation based on smart-1 array data

Hao, Hong; Oliveira, Carlos Sousa; Penzien, Joseph

doi:10.1016/0029-5493(89)90241-0

Cited by 291 publications

(152 citation statements)

References 5 publications

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“…A number of parametric coherency models have been proposed to describe the incoherence e®ect. [4][5][6][7][8][9] The local e®ect is caused by variations in the local soil condition, which in°uences the amplitude and frequency content of the bedrock ground motions. Physical causes underlying these variations can be summarized as the seismic wave traveling e®ect, extended source e®ect, scattering e®ect and attenuation e®ect.…”

Section: Introductionmentioning

confidence: 99%

Wave-Passage Effect of Earthquake Loadings on Long Structures

Wang

Hao

et al. 2016

Int. J. Str. Stab. Dyn.

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The wave-passage e®ect of earthquake loadings on long-span structures is studied through use of a multiply-supported single-degree-of-freedom (SDOF) system excited by traveling seismic ground motions. The absolute acceleration response of the SDOF system is represented in the analytical form in the time domain. The frequency-domain analysis results indicate that the wave-passage e®ect may reduce the absolute acceleration response and the earthquake loading acting on the multiply-supported SDOF system. Further, for di®erent velocities of wave-passage, the response spectra are calculated to represent the reduction of the maximum earthquake loading on the long-span system caused by the wave-passage e®ect. The computation results of the response spectra indicate that the reduction of the maximum earthquake loading is°uc-tuant, but has a general tendency to decrease with the increase in the apparent wave velocity and the structural natural period.

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Section: Introductionmentioning

confidence: 99%

Wave-Passage Effect of Earthquake Loadings on Long Structures

Wang

Hao

et al. 2016

Int. J. Str. Stab. Dyn.

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“…Their frequency content and amplitude are altered as they pass through successive soil media, and eventually they reach consecutive supports of long structures having a variable pattern, introducing this way differential movements to the supports of such structures [3]. This phenomenon is most commonly referred to as the spatial variability of the ground motion (SVGM) and has been extensively studied by many researchers; [4,5,6,7,8], among others.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Multi-Angle, Spatially Variable Seismic Motions on Cable-Stayed Bridges

Efthymiou¹,

Cámara²

2017

Proceedings of the 6th International Conference on Computational Methods in Structural Dynamics and Earthquake Engineering (COM

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Abstract. The spatial variability of the ground motion can be a key factor to the design of cable-stayed bridges to resist seismic actions due to the critical effect of the asynchronous movement that it introduces between the towers. Cable-stayed bridges are landmark structures consisting key parts of transportation networks and their integrity must be ensured even under extreme seismic events. This work examines the effect that spatially variable ground motions have on the towers of a cable-stayed bridge with 200 m main span. Two different orientations of the structure are examined in an attempt to shed light into the orientation-dependent seismic response of the towers. Additionally, three different propagation velocities of the seismic waves are adopted and the results are compared to those obtained under synchronous ground motions.

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“…Based on the SMART-1 recordings, Hao et al (1989) proposed an empirical coherency loss function, which was recently improved by Bi and Hao (2012) to incorporate the capability of simulating spatially varying ground motions, which are design spectrum compatible. Discussion of the validity and limitations of some spatial coherency models was presented in the study of Zerva and Zervas (2002).…”

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confidence: 99%

Field Tests on Total Gap of Modular Expansion Joints to Avoid Bridge Pounding

Chouw

2016

Front. Built Environ.

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Modular expansion joints (MEJs) are used for accommodating large relative displacements of adjacent bridge segments and for completely eliminating pounding. However, the minimum total gap that an MEJ needs to avoid pounding is not well investigated. To provide guidance for the seismic gap of MEJs, the maximum relative displacement of adjacent bridge segments subject to strong earthquakes was studied experimentally. To date, no experimental investigation of excitation spatial variation effect on bridge on natural soil has been reported. This research addressed a bridge with three identical segments of 100 m. A 1:22 scale bridge model founded on compacted beach sand was tested using electromagnetic inertial exciters. Different ground motions were applied to the model to simulate the effect of spatially varying ground motions. Soil-structure interaction (SSI) was studied by comparing the minimum total gaps with those obtained from the fixed-based experiments in the laboratory. The spatially varying ground motions were simulated based on the New Zealand design spectra for soft soil, shallow soil, and strong rock conditions using an empirical coherency loss function. SSI was found to reduce the minimum total gap of an MEJ needed to avoid pounding between adjacent segments. Under spatially varying ground motions designing adjacent bridge segments with identical or similar fundamental frequencies is still recommended even if it does not necessarily preclude an out-of-phase movement of adjacent structures.

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Multiple-station ground motion processing and simulation based on smart-1 array data

Cited by 291 publications

References 5 publications

Wave-Passage Effect of Earthquake Loadings on Long Structures

Wave-Passage Effect of Earthquake Loadings on Long Structures

The Effect of Multi-Angle, Spatially Variable Seismic Motions on Cable-Stayed Bridges

Field Tests on Total Gap of Modular Expansion Joints to Avoid Bridge Pounding

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