Fragility estimation and sensitivity analysis of an idealized pile-supported wharf with batter piles |
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| Affiliation: | 1. School of Civil Engineering, College of Engineering, University of Tehran, Tehran, Iran;2. Member of Civil Engineering Department, University of Maragheh, Maraghe, Iran;3. CH2M HILL, 1100 NE Circle Blvd, Suite 300, Corvallis, OR, USA;1. Department of Civil Engineering, National Cheng Kung University, Tainan, 70101, Taiwan;2. National Center for Research on Earthquake Engineering, National Applied Research Laboratories, Taipei, 10668, Taiwan;1. Kyoto University, Uji, Kyoto, Japan;2. FLIP Consortium, Jiji-Press Bld. 5th floor, Nakahoricho 185, Nakagyoku, Kyoto 604-0844, Japan;1. ROSE School, Centre for Post-Graduate Training and Research in Earthquake Engineering & Engineering Seismology, Via Ferrata 1, 27100 Pavia, Italy;2. Department of Civil Engineering and Architecture, University of Pavia, Via Ferrata 1, 27100 Pavia, Italy;3. EUCENTRE, European Centre for Training and Research in Earthquake Engineering, Via Ferrata 1, 27100 Pavia, Italy;1. GRI, Beaverton, OR, 97008, USA;2. Department of Civil and Environmental Engineering, Portland State University, Portland, OR, 97201, USA;3. New Albion Geotechnical, Inc., Reno, NV, 89509, USA;4. Jacobs, Corvallis, OR, 97330, USA;5. GRI, Beaverton, OR, 97008, USA |
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| Abstract: | The main objective of the present study is to develop seismic fragility curves of an idealized pile-supported wharf with batter piles through a practical framework. Proposing quantitative limit states, analytical fragility curves are developed considering three engineering demand parameters (EDPs), including displacement ductility factor (µd), differential settlement between deck and behind land (DS) and normalized residual horizontal displacement (NRHD). Analytical fragility curves are generated using the results of a numerical model. So, the accuracy and reliability of resulted fragility curves directly depend on how accurate the seismic demand quantities are estimated. In addition, the seismic performance of pile-supported wharves is highly influenced by geotechnical properties of the soil structure system. Hence, a sensitivity analysis using the first-order second-moment (FOSM) method is performed to evaluate the effects of geotechnical parameters uncertainties in the seismic performance of the wharf.Herein, the seismic performance of the wharf structure is simulated using the representative FLAC2D model and performing nonlinear time history analyses under a suit of eight ground motion records. Incremental dynamic analysis (IDA) is used to estimate the seismic demand quantities. As a prevailing tool, adopted fragility curves are useful to seismic risk assessment. They can also be used to optimize wharf-retrofit methods. The results of sensitivity analysis demonstrate that uncertainties associated with the porosity of loose sand contribute most to the variance of both NRHD and µd. While in the case of differential settlement, the friction angle of loose sand contributes most to the variance. |
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| Keywords: | Seismic vulnerability Fragility curve Pile supported wharf Incremental dynamic analysis FOSM analysis |
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