Determination of scoured bridge natural frequencies with soil–structure interaction |
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| Institution: | 1. Department of Structural and Geotechnical Engineering, Sapienza University of Rome, via Eudossiana 18, 00184 Rome, Italy;2. Department of Civil, Chemical, Environmental and Materials Engineering, University of Bologna, via Terracini 28, 40131 Bologna, Italy;3. Department of Civil, Environmental, Building Engineering and Chemistry, Technical University of Bari, via Orabona 4, 70125 Bari, Italy;1. DICEA-Università Politecnica delle Marche, Ancona, Italy;2. DESD-University of San Marino, San Marino, Republic of San Marino;3. SAAD-University of Camerino, Ancona, Italy |
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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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| Keywords: | Bridge Effective mass Experiment Finite element analysis Lanczos method Natural frequency Scour Soil–fluid–structure interaction |
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