Effects of Parameters on Non-Linear Seismic Analysis of Fixed Offshore Platform

Ali Sarı; Kubilay Çiçek

doi:10.15866/irece.v13i5.21186

Effects of Parameters on Non-Linear Seismic Analysis of Fixed Offshore Platform

Ali Sarı^(1*), Kubilay Çiçek⁽²⁾

^(*) Corresponding author

Authors' affiliations

DOI: https://doi.org/10.15866/irece.v13i5.21186

Abstract

Fixed offshore structures in seismically active zones are likely to have deformations large enough to exceed the elastic limits of materials under strong ground motions. Therefore, investigation of nonlinear response of offshore structures under dynamic loadings is very interesting to structural engineers. Nonlinear behavior of structures is highly related with the soil properties and soil behavior. The main purpose of this study is to investigate and show the methodology for inelastic dynamic analyses of fixed-offshore structures under the 10,000-year earthquake loadings. The investigation in this study includes the effect of soil radiation damping, soil-pile gapping, and soil degradation on fixed offshore structures. Additionally, the effect of the direction of earthquake is included in this study. An offshore structure model ‘Platform A’ is modeled in CAPFOS. 10,000-year earthquake events are considered and for this purpose, two different earthquakes are used: Hector Mine Earthquake (1999) and Landers Earthquake (1992). These ground motion records are scaled to have a resulting earthquake that has a return period of 10,000-year. CAPFOS software is used to complete time-history analyses with these earthquakes. Results indicate that: (i) Considering the soil radiation damping negligible is not correct, because without the radiation damping, the total damping ratio is estimated as % 3, while including radiation damping raises the ratio to % 4.5, (ii) soil-pile gapping and soil radiation damping generate adverse effects on analyses outcome, and (iii) using high values of soil degradation factors is not always conservative.
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Keywords

Fixed Offshore Platforms; Soil-Pile Gapping; Soil Radiation Damping; Soil Degradation

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References

P. Arnold, R. G. Bea, I. M. Idriss, R. B. Reimer, K. E. Beebe, and P. W. Marshall, A study of soil-pile-structure systems in severe earthquakes, Offshore Technology Conference, January, 1977.
https://doi.org/10.4043/2749-MS

R. W. Boulanger, C. J. Curras, B. L. Kutter, D. W. Wilson and A. Abghari, Seismic soil-pile-structure interaction experiments and analyses, Journal of geotechnical and geoenvironmental engineering, 125(9), 750-759, 1999.
https://doi.org/10.1061/(ASCE)1090-0241(1999)125:9(750)

Y. E. Mostafa, and M. H. El Naggar, Response of fixed offshore platforms to wave and current loading including soil-structure interaction, Soil Dynamics and Earthquake Engineering, 24(4), 357-368, 2004.
https://doi.org/10.1016/j.soildyn.2003.11.008

M. H. Bagheripour, R. Rahgozar, and M. Malekinejad,Efficient analysis of SSI problems using infinite elements and wavelet theory, Geomechanics and Engineering, 2(4), 229-252, 2010.
https://doi.org/10.12989/gae.2010.2.4.229

S. H. RezaTabatabaiefar, B. Fatahia, and B. Samali, Lateral seismic response of building frames considering dynamic soil-structure interaction effects, Structural Engineering and Mechanics, 45(3), 311-321, 2013.
https://doi.org/10.12989/sem.2013.45.3.311

K. A. Abhinav and N. Saha, Stochastic response of jacket supported offshore wind turbines for varying soil parameters, Renewable Energy, 101, 550-564, 2017.
https://doi.org/10.1016/j.renene.2016.09.019

Abbas, J., Experimental Investigation of Pile Foundation Subjected to Lateral Static and Cyclic Loadings, (2020) International Review of Civil Engineering (IRECE), 11 (3), pp. 127-134.
https://doi.org/10.15866/irece.v11i3.17102

Pujiastuti, H., Rifa'i, A., Adi, A., Fathani, T., Analytical and Experimental Study of Pile Capacity in Unsaturated Sandy Clay, (2021) International Review of Civil Engineering (IRECE), 12 (1), pp. 1-10.
https://doi.org/10.15866/irece.v12i1.17041

API RP 2A, Recommended Practice for Planning, Design and Constructing Fixed Offshore Platforms 20th Edition (American Petroleum Institute, 2000).

S. Limkatanyu, K. Kuntiyawichai and E. Spacone, Response of reinforced concrete piles including soil-pile interaction effects, Engineering Structures, 31(9), 1976-1986, 2009.
https://doi.org/10.1016/j.engstruct.2009.03.005

R. Dobry, E. Vicente, M. O'Rourke and M. Roesset, Horizontal stiffness and damping of single piles, Journal of Geotechnical and Geoenvironmental Engineering, 108(GT3), 1982.
https://doi.org/10.1061/AJGEB6.0001259

G. Gazetas and R. Dobry, Simple radiation damping model for piles and footings, Journal of Engineering Mechanics, 110(6), 937-956, 1984.
https://doi.org/10.1061/(ASCE)0733-9399(1984)110:6(937)

S. Tileylioglu, J. P. Stewart and R. L. Nigbor, Dynamic stiffness and damping of a shallow foundation from forced vibration of a field test structure, Journal of Geotechnical and Geoenvironmental Engineering, 137(4), 344-353, 2011.
https://doi.org/10.1061/(ASCE)GT.1943-5606.0000430

S. Bisoi and S. Haldar, Dynamic analysis of offshore wind turbine in clay considering soil-monopile-tower interaction, Soil Dynamics and Earthquake Engineering, 63, 19-35, 2014.
https://doi.org/10.1016/j.soildyn.2014.03.006

D. Mao, C. Zhong, L. Zhang, and G. Chu, "Dynamic response of offshore jacket platform including foundation degradation under cyclic loadings", Ocean Engineering, 100, 35-45, 2015.
https://doi.org/10.1016/j.oceaneng.2015.03.012

F. Cavalieri, A. A. Correia, H. Crowley and R. Pinho, "Dynamic soil-structure interaction models for fragility characterisation of buildings with shallow foundations", Soil Dynamics and Earthquake Engineering, 132, 106004, 2020.
https://doi.org/10.1016/j.soildyn.2019.106004

S. Pranjoto and M. J. Pender, Gapping effects on the lateral stiffness of piles in cohesive soil, Proceedings of Pacific Conference on Earthquake Engineering, Christchurch, New Zealand, February, 2003.

B. Fatahi, S. Basack, P. Ryan, W. H. Zhou and H. Khabbaz, Performance of laterally loaded piles considering soil and interface parameters, Geomechanics and Engineering. 7(5), 495-524, 2014.
https://doi.org/10.12989/gae.2014.7.5.495

X. Xiao and Y. Heng, Effects of Soil Type on Single Pile-Soil Gap and Force Acting on Pile Body under Low Cyclic Loading. In IOP Conference Series: Earth and Environmental Science (Vol. 455, No. 1, p. 012049). IOP Publishing, February, 2020.
https://doi.org/10.1088/1755-1315/455/1/012049

N. Gerolymos, and G. Gazetas, Constitutive model for 1-D cyclic soil behaviour applied to seismic analysis of layered deposits, Soils and Foundations, 45(3), 147-159, 2005.
https://doi.org/10.3208/sandf.45.3_147

R. Tuladhar, T. Maki and H. Mutsuyoshi, Cyclic behavior of laterally loaded concrete piles embedded into cohesive soil, Earthquake Engineering and Structural Dynamics, 37(1), 43-59, 2008.
https://doi.org/10.1002/eqe.744

S. Y. Thian and C. Y. Lee, Shear Strength Degradation Behavior of Offshore Clay Under Cyclic Loading, Soil Mechanics and Foundation Engineering, 54(6), 430-435, 2018.
https://doi.org/10.1007/s11204-018-9492-6

W. Nam, K. Y. Oh and B. I. Epureanu, Evolution of the dynamic response and its effects on the serviceability of offshore wind turbines with stochastic loads and soil degradation, Reliability Engineering and System Safety, 184, 151-163, 2019.
https://doi.org/10.1016/j.ress.2018.03.017

Y. Liu, M. Huangand S. Ma, A simplified calculation method for axial cyclic degradation of offshore wind turbine foundations in clay, Marine Georesources and Geotechnology, 38(2), 204-213, 2020.
https://doi.org/10.1080/1064119X.2019.1566296

M., Zarrin, A. R. M., Gharabaghi, and M., Poursha, A multi-mode N2 (MN2) pushover procedure for ductility level seismic performance evaluation of jacket type offshore platforms, Ocean Engineering, 220, 108440, 2021
https://doi.org/10.1016/j.oceaneng.2020.108440

F., Bezir, K., Cicek, and A., Sari, Seismic Fragility Analysis of Jacket Type Offshor Structures, International Conference on Earthquake Engineering and Seismology (5ICEES), Vol. 8, p. 11, October, 2019.

A., Ajamy, B., Asgarian, C. E., Ventura, & M. R. Zolfaghari, Seismic fragility analysis of jacket type offshore platforms considering soil-pile-structure interaction, Engineering Structures, 174, 198-211, 2021.
https://doi.org/10.1016/j.engstruct.2018.07.066

A. C. Altunışık and E. Kalkan, Investigation of Earthquake Angle Effect on Seismic Performance of Steel Bridges, Steel and Composite Structures, 22(4), 855, 2016.
https://doi.org/10.12989/scs.2016.22.4.855

M. Sun, F. Fan, B. Sun and X. Zhi, Study on the effect of ground motion direction on the response of engineering structure, Earthquake Engineering and Engineering Vibration, 15(4), 649-656, 2016.
https://doi.org/10.1007/s11803-016-0355-8

F. Sharmin, M. Hussan, D. Kim, and S. G. Cho, Influence of soil-structure interaction on seismic responses of offshore wind turbine considering earthquake incident angle, Earthquakes and Structures, 13(1), 39-50, 2017.
http://dx.doi.org/10.12989/eas.2017.13.1.039

A. M., Nair, and M. V., Varkey, Seismic Analysis of Offshore Wind Turbine Foundations, International Research Journal of Engineering and Technology (IRJET), 6(6), 773-779, 2019.

CAPFOS (2012), "User manual for CAP, Capacity Analysis Program for Offshore Structures, Version 7.44", CAPFOS, California.

P. González, Considering earthquake direction on seismic analysis, Proceedings of The Tenth World Conference on Earthquake Engineering. Vol. 7. 1992.

Anil K. Chopra, Dynamics of Structures: Theory and Applications to Earthquake Engineering (Prentice Hall, 2001).

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