Assessment of Soil Stiffness Properties by Dynamic Tests on Bridges

Sokol, Milan; Flesch, Rainer

doi:10.1061/(asce)1084-0702(2005)10:1(77)

Cited by 6 publications

(15 citation statements)

References 8 publications

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“…The real moment of inertia with the stiffener was 3.75E-05 m 4 . For the system identification, only the first mode-shape was applied, and it was smoothed in accordance with an original procedure from Sokol and Flesch (2005). In comparison with Venglar and Sokol (2015), the satisfactory degree of accuracy of the identification was achieved in this way.…”

Section: Damage Assessment Of the Experimental Modelmentioning

confidence: 99%

Choice of Appropriate Control Values for Effective Analyses of Damage Detection

Venglár

Sokol

2017

Slovak Journal of Civil Engineering

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Section: Damage Assessment Of the Experimental Modelmentioning

confidence: 99%

Choice of Appropriate Control Values for Effective Analyses of Damage Detection

Venglár

Sokol

2017

Slovak Journal of Civil Engineering

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“…The values α p , β p , γ p and δ p can be assessed by parametric studies expressing the relative error of the approximation at the boundary between parts p and p + 1 (Sokol and Flesch, 2005 …”

Section: Continuity Conditions For Two Adjacent Functionsmentioning

confidence: 99%

“…The procedure how to calculate shear wave velocities in subsoil in the vicinity of the vibrating bridge pier is described in detail by Sokol and Flesch (2005). For clarity, the basic steps of this calculation are repeated also here.…”

Section: Evaluation Of the Approximation Function Bymentioning

confidence: 99%

“…One parameter already measured during the tests that can be used here is an eigenfrequency of vibration. An approximation using this method has been derived for near the pier areas (Sokol and Flesch, 2005), and in this paper it is enhanced to the whole length of the bridge.…”

Section: Introductionmentioning

confidence: 99%

“…The statistical evaluation of the stiffness parameter is performed using more vertical modes obtained from experimental results. The previous method (Sokol and Flesch, 2005), which was derived for near the pier areas, has been enhanced to the whole length of the bridge. The experimental data describing the mode shapes are not appropriate for direct use.…”

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confidence: 99%

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The approximation function of bridge deck vibration derived from the measured eigenmodes

Sokol

Komorníková

Bacigál

et al. 2017

International Journal of Applied Mathematics and Computer Science

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This article deals with a method of how to acquire approximate displacement vibration functions. Input values are discrete, experimentally obtained mode shapes. A new improved approximation method based on the modal vibrations of the deck is derived using the least-squares method. An alternative approach to be employed in this paper is to approximate the displacement vibration function by a sum of sine functions whose periodicity is determined by spectral analysis adapted for non-uniformly sampled data and where the parameters of scale and phase are estimated as usual by the least-squares method. Moreover, this periodic component is supplemented by a cubic regression spline (fitted on its residuals) that captures individual displacements between piers. The statistical evaluation of the stiffness parameter is performed using more vertical modes obtained from experimental results. The previous method (Sokol and Flesch, 2005), which was derived for near the pier areas, has been enhanced to the whole length of the bridge. The experimental data describing the mode shapes are not appropriate for direct use. Especially the higher derivatives calculated from these data are very sensitive to data precision.

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Evaluation of seismic response of bridges under asynchronous excitation and comparisons with Eurocode 8-2 provisions

Sextos

Kappos

2008

Bull Earthquake Eng

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The paper aims to evaluate the way Eurocode 8 treats the consideration of asynchronous earthquake ground motion during the seismic design of bridges, and to discuss alternative solutions for cases wherein existing provisions do not lead to satisfactory results. The evaluation of EC8-2 new provisions and simplified methods is performed through comparison with a more refined approach whereas an effort is made to quantitatively assess the relative importance of various design and analysis assumptions that have to be made when spatial variability of ground motion is taken into consideration, based on the study of the dynamic response of 27 different bridges. It is concluded that, despite the complexity of the problem, there are specific cases where EC8 provisions can be safely and easily applied in practice, while in other cases ignoring the effect of asynchronous excitation or performing simplified calculations can significantly underestimate the actual seismic demand.

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Assessment of Soil Stiffness Properties by Dynamic Tests on Bridges

Cited by 6 publications

References 8 publications

Choice of Appropriate Control Values for Effective Analyses of Damage Detection

Choice of Appropriate Control Values for Effective Analyses of Damage Detection

The approximation function of bridge deck vibration derived from the measured eigenmodes

Evaluation of seismic response of bridges under asynchronous excitation and comparisons with Eurocode 8-2 provisions

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