Theoretical basis and numerical simulation of parallel seismic test for existing piles using flexural wave |
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| Institution: | 1. Institute of Engineering Safety and Disaster Prevention, Department of Civil Engineering, Shanghai Jiao Tong University, Shanghai 200240, China;2. Sichuan Institute of Building Research, Chengdu 610081, China;3. Department of Civil Engineering, University of Nebraska Lincoln, Omaha, NE 68118, USA;1. Department of Physics and Astronomy, University of Lethbridge, Lethbridge, AB, Canada T1K 6R4;2. Institut de Physique de Rennes, UMR CNRS 6251, Université de Rennes 1, 35042 Rennes, France;3. Department of Physics, The College of William and Mary, Williamsburg, VA 23187, USA;4. Science Directorate, NASA Langley Research Center, Hampton, VA 23681, USA;5. Dept. of Physics, Astronomy and Geophysics, Connecticut College, New London, CT 06320, USA;1. University of Cagliari, DICAAR — Dept. of Civil and Environmental Engineering and Architecture, 2, via Marengo, I-09123 Cagliari, Italy;2. Technische Universität Dresden, Institut Statik und Dynamik der Tragwerke, D-01062 Dresden, Germany;1. Department of Physics, Kuvempu University, Shankaraghatta 577451, Karnataka, India;2. Department of Physics, Indian Institute of Science, Bangalore 560012, Karnataka, India;1. General Directorate of State Highways, 1st Division Directorate, Kağıthane, 34408 Istanbul, Turkey;2. Department of Civil Engineering, Faculty of Engineering, Bartin University, Bartin, and Structural and Earthquake Engineering, Faculty of Civil Engineering, Istanbul Technical University, Maslak, 34469 Istanbul, Turkey;3. Kandilli Observatory and Earthquake Research Institute, Department of Earthquake Engineering, Bogazici University, Cengelkoy, 34684 Istanbul, Turkey |
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| Abstract: | This paper presents theoretical analysis of the parallel seismic (PS) method for evaluating existing piles using the flexural mode wave exited by a horizontal impact on the lateral surface of a pile. A simplified theoretical model of the flexural wave for PS method was established to elaborate the theoretical basis. A correction factor was then obtained and proposed to correct the pile depth obtained from the PS method, thus providing a more accurate estimation. A three dimension (3-D) finite element (FE) model was developed and the existence of the flexural waves on branch F(1, 1) in the pile shaft has been verified. Two time domain methods were used to calculate the flexural wave velocity in the pile. One was based on the pile tip reflection signal using a model where pile head reflection was minimized, and another method used the slope of the upper fitted line in the PS test. The flexural wave velocities from both methods match well with the predicted flexural wave group velocity determined from the dispersion curve of a 1-D rod embedded in the soil. The accuracy in estimation of pile tip depth is improved by applying the correction factor. A series of parametric studies were carried out to demonstrate the effectiveness of using flexural wave for PS test and the correction factor proposed in this study. |
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| Keywords: | Existing pile Parallel seismic test Integrity testing Flexural wave Nondestructive test |
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