Probabilistic Assessment of Pseudo-Static Design of Gravity-Type Quay Walls

Document Type: Research Papers

Authors

1 Faculty of Civil Engineering, University of Tabriz, Tabriz, Iran

2 Faculty of civil Engineering, university of Tabriz, Tabriz, Iran

Abstract

Failure of the quay walls due to earthquakes results in severe economic loss. Because of hazards threatening such inexpensive nodes of national and international transportation networks, seismic design of quay walls is still an evolving topic in marine structural engineering. This study investigates the sensitivity of the gravity-type quay wall stability respect to uncertain soil and seismic properties using ultimate limit-sate pseudo-static design process. Stability is defined in terms of safety factor against sliding (sfs), overturning (sfo) and exceeding bearing capacity (sfb). In order to assess the forces exerting on quay walls, to be more accurate, pore water pressure ratio, horizontal and vertical inertia forces, fluctuating and non-fluctuating components of hydraulic and soil pressure were considered. It was found that the increase of water depth in front of the quay, vertical and horizontal seismic coefficients, and pore water pressure ratio play important roles in reduction of all mentioned safety factors. Increase of specific weight of the rubble mound, backfill and foundation soil, friction angle of wall-foundation/seabed interface and wall back-face/backfill interface and friction angle of backfill soil, lead safety factors to magnify. A comprehensive sensitivity analysis was also performed using the tornado diagrams. Results of this study could give designers insights into the importance of uncertain soil and seismic factors, in order to choose geometry of the design in a way that its analysis and assessment is less relied on severely uncertain parameters and to introduce more reliable and economic quay walls.

Keywords


Alyami, M., Rouainia, M. and Wilkinson, S.M. (2009). “Numerical analysis of deformation behavior of quay walls under earthquake loading”, Soil Dynamics and Earthquake Engineering, 29, 525-536.
Alyami, M., Wilkinson, S.M., Rouainia, M. and Cai, F. (2007). “Simulation of seismic behavior of gravity quay wall using a generalized plasticity model”, The 4th International Conference on Earthquake Geotechnical Engineering, Paper No. 1734, Thessaloniki, Greece, 25-28 June.
Bowles, E.J. (1996). Foundation analysis and design, 5th Edition, MCGraw-Hill, Inc.
Chen, C.H. (2000). “Preliminary analysis for quay wall movement in Taichung Harbour during the September 21, 1999, Chi-Chi earthquake”, Earthquake Engineering and Engineering Seismology, 2(1), 43-54.
Choudhury, D. and Ahmad, S.M. (2007). “Stability of waterfront retaining wall subjected to pseudo-static earthquake forces”, Ocean Engineering, 34, 1947-1954.
Choudhury, D. and Ahmad, S.M. (2008). “Stability of waterfront retaining wall subjected to pseudo-dynamic earthquake forces”, Journal of Waterway, Port, Coastal and Ocean Engineering, 134(4), 252-260.
Ebeling, R.M. and Morrison Jr., E.E. (1992). “The seismic design of waterfront retaining structures”, US Army Technical Report ITL-92-11, Washington, DC.
Iai, S., Ichii, K., Liu, H. and Morita, T. (1995). “Effective stress analyses of port structures”,  Soils and Foundations, Special Issue on Geotechnical Aspects of the January 17, Japanese Society, Hyogoken-Nambu Earthquake, 2, 97-114.
Jones A.L., Kramer S.L. and Arduino, P. (2002). “Estimation of uncertainty in geotechnical properties for performance-based earthquake engineering”, Report 2002/16, Pacific Earthquake Engineering Research Center, University of California, Berkeley.
Kim, S.R., Jang, I.S., Chung, C.K. and Kim, M.M. (2005). “Evaluation of seismic displacements of quay walls”, Soil Dynamics and Earthquake Engineering, 25, 451–459.
Kim, S.R., Kwon, S.O. and Kim, M.M. (2004). “Evaluation of force components acting on gravity type quay walls during earthquakes”, Soil Dynamics and Earthquake Engineering, 24, 835-866.
Kramer, S.L. (1996). Geotechnical earthquake engineering, Englewood Cliffs, NJ: Prentice- Hall.
Kramer, S.L. and Elgamal, A.W. (2001). “Modeling soil liquefaction hazards for performance based earthquake engineering”, Report 2001/13, Pacific Earthquake Engineering Research Center, University of California, Berkeley.
Lee, T.H. and Mosalam, K.M. (2006). “Probabilistic seismic evaluation of reinforced concrete structural components and systems”, Report 2006/04, Pacific Earthquake Engineering Research Center, University of California, Berkeley.
Mylonakis, G., Kloukinas, P. and Papantonopoulos, C. (2007). “An alternative to the Mononnobe- Okabe equations for seismic earth pressures”, Soil Dynamics and Earthquake Engineering, 27, 957-969.
Porter K.A. and Beck J.L. (2002). “Shaikhutdinov RV. Sensitivity of building loss estimates to major uncertain variables”, Earthquake Spectra, 18(4), 719–43.
Quinn, A.D. (1972). Design and construction of ports and marine structures, New York: McGraw-Hill, Inc.
Seed, H. and Whitman, R. (1970). “Design of earth retaining structures for dynamic loads”, ASCE Specialty Conference on Lateral Stresses in the Ground and Design of Earth Retaining Structures, Ithaca, N.Y., 103-147.
International Navigation Association, Working Group No. 34 of the Maritime Navigation Commission.            (2001). PIANC, Seismic design guidelines for port structures, A.A. Balkema Publishers / Lisse / Abingdon / Exton (PA) / Tokyo.
Sowers, G.F. (1993). “Human factors in civil and geotechnical engineering failures”, Journal of Geotechnical Engineering, 119(2), 238-256.
Werner, S.D. (1998). “Seismic guidelines for ports”, Monograph No.12, New York, ASCE, Chapter 2.
Zangar, C.N. (1953). “Hydrodynamic pressures on dams due to horizontal earthquakes”, Proceedings of Experimental Stress Analysis, 10(2), 93-102.