Determination of scoured bridge natural frequencies with soil-structure interaction

Research output: Contribution to journalArticle

31 Citations (Scopus)

Abstract

This study developed a finite element method with the effect of soil-fluid-structure interaction to calculate bridge natural frequencies. The finite element model includes bridge girders, piers, foundations, soil, and water. The effective mass above the soil surface was then used to find the first natural frequency in each direction. A field experiment was performed to validate that the natural frequencies calculated using the proposed finite element method had acceptable accuracy. The calculated natural frequencies with the fluid-structure interaction effect are always smaller than those without this effect. However, the frequency change due to the fluid effect is not obvious, so using the soil-structure interaction model is accurate enough in the bridge natural frequency analysis. The trend of the frequency decreases with the increase of the scour depth, but the curve is not smooth because of non-uniform foundation sections and layered soils. However, when the scour depth is such that pile cap is exposed, the changes in natural frequency with the scour depth are more obvious, and this is useful for measurement of the depth using bridge natural frequencies.

Original languageEnglish
Pages (from-to)247-254
Number of pages8
JournalSoil Dynamics and Earthquake Engineering
Volume55
DOIs
Publication statusPublished - 2013 Dec 1

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Soil structure interactions
soil-structure interaction
soil structure
Natural frequencies
scour
fluid-structure interaction
Scour
finite element method
Soils
Fluid structure interaction
soil
pier
frequency analysis
pile
soil surface
Finite element method
Bridge piers
Beams and girders
layered soils
fluid

All Science Journal Classification (ASJC) codes

  • Civil and Structural Engineering
  • Geotechnical Engineering and Engineering Geology
  • Soil Science

Cite this

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abstract = "This study developed a finite element method with the effect of soil-fluid-structure interaction to calculate bridge natural frequencies. The finite element model includes bridge girders, piers, foundations, soil, and water. The effective mass above the soil surface was then used to find the first natural frequency in each direction. A field experiment was performed to validate that the natural frequencies calculated using the proposed finite element method had acceptable accuracy. The calculated natural frequencies with the fluid-structure interaction effect are always smaller than those without this effect. However, the frequency change due to the fluid effect is not obvious, so using the soil-structure interaction model is accurate enough in the bridge natural frequency analysis. The trend of the frequency decreases with the increase of the scour depth, but the curve is not smooth because of non-uniform foundation sections and layered soils. However, when the scour depth is such that pile cap is exposed, the changes in natural frequency with the scour depth are more obvious, and this is useful for measurement of the depth using bridge natural frequencies.",
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Determination of scoured bridge natural frequencies with soil-structure interaction. / Ju, Shen-Haw.

In: Soil Dynamics and Earthquake Engineering, Vol. 55, 01.12.2013, p. 247-254.

Research output: Contribution to journalArticle

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