Publication list

Journal papers:
[Jxx]Zhou, T., Tian, Y., Randolph, M.F., and Cassidy, M.J. (2017) “Coupled analysis of pipeline subjected to vertical compression and uplift loading considering loading rate”. Under internal review. Download
[Jxx]Zhou, T., Tian, Y., Randolph, M.F., and Cassidy, M.J. (2017) “Comparative Study of Comparative Study of Structure-soil Interfaces to Model Compression and Uplift of a Surface Footing on Clay”. Under internal review. Download
[Jxx]Zhang, W., Cassidy, M.J. and Tian, Y. (2016) “A practical large deformation finite element method for 3D
geotechnical problems involving complex free surfaces”. Computers and Geotechnics.
Download
[J44]Tian, Y., Gaudin, C. and Cassidy, M.J. (2017) “A New Approach to Develop Plasticity force-resultant Model”. Acta Geomechnica, to be submitted. Download
[43]Zhou, T., Tian, Y., White, D.J. and Cassidy, M.J. (2017) “Finite Element Analysis of Pipeline Buckling”. Journal of Pipeline Systems – Engineering and Practice, submitted. Download
[J42]Song, F. and Tian, Y. (2017) “Numerical Modelling of Geocell Reinforced Soils and Its Application in Geotechnical Engineering”. Geomechanics and Engineering, Submitted. Download
[J41]Fu, D., Gaudin, C., Bienen, B., Tian, Y. and Cassidy, M.J. (2017) “Combined Load Capacity of a Preloaded Skirted Circular Foundation in Clay”. Journal of Geotechnical and Geoenvironmental Engineering (ASCE), Submitted. Download
[J40]Fu, D., Gaudin, C., Tian, Y., Bienen, B. and Cassidy, M.J. (2017) “Post-preload Undrained Uniaxial Capacities of Skirted Circular Foundations in Clay”. Ocean Engineering, 147:355-369. Download
[J39]Zhou, T., Tian, Y. and Cassidy, M.J. (2017) “Effect of Tension on the Combined Loading Failure Envelope of a Pipeline on Soft Clay Seabed”. International Journal of Geomechanics, Submitted. Download
[J38]Tian, Y., Gaudin, C., Randolph, M.F, Cassidy, M.J. and Peng, B. (2017) “Numerical Investigation of the Diving Potential of Offshore Anchors”. Journal of Geotechnical and Geoenvironmental Engineering (ASCE)In press. Download
[J37]Fu, D., Gaudin, C., Tian, Y., Cassidy, M.J. and Bienen, B.(2017) “Uniaxial Capacities of Skirted Foundations in Clay”. Journal of Geotechnical and Geoenvironmental Engineering (ASCE), accepted 5 December 2016. Download
[J36]Gaudin, C., Cassidy, M.J., O’Loughlin, C.D., Tian, Y., Wang, D., Chow, S. (2017) “Recent development in anchor design for floating structures”. International Journal of Offshore and Polar Engineering, 27(1): 44-53. (Selected journal edition of 12th ISOPE Pacific/Asia Offshore Mechanics Symposium, keynote paper). Download
[J35]Yan, S., Zhang, J., Tian, Y. and Sun, L. (2016) “Pore Pressure Characteristics in Isotropic Consolidated Saturated Clay under Unloading Conditions”. Journal of Marine Science and Technology, 24(1):19-25. Download
[J34]Xiao, Z., Tian, Y. and Gourvenec, S. (2016) “A Practical Method to Evaluate Failure Envelopes of Shallow Foundations Considering Soil Strain Softening and Rate Effect”. Applied Ocean Research, 59, 395-407. Download
[J33]Li, J., Zhou, Y., Zhang, L., Tian, Y., Cassidy, M.J. and Zhang, L. (2016) “Random finite element for spudcan foundations in spatially variable soils”. 205, 146-155. Engineering Geology, http://dx.doi.org/10.1016/j.enggeo.2015.12.019 Download
[J32]Li, J., Cassidy, M.J., Tian, Y., Huang, J., Lyamin, A. and Uzielli, M. (2015) “Buried footings in random soils: comparison of limit analysis and finite element analysis”. Georisk. 10(1), 55-65. DOI: 10.1080/17499518.2015.1064141 Download
[J31]Li, X., Gaudin, C., Tian, Y. and Cassidy, M.J. (2015) “Effects of preloading and consolidation on the uplift capacity of skirted foundations”. Geotechnique. 65(12), 1010-1022. DOI:10.1680/geot./15-P-026 Download
[J30]Li, X., Tian, Y., Gaudin, C. and Cassidy, M.J. (2015) “Comparative study of the compression and uplift of shallow foundations”. Computers and Geotechnics, 69, 38-45. DOI: 10.1016/j.compgeo.2015.04.018. Download
[J29]Tian, Y., Randolph, M.F. and Cassidy, M.J. (2015) “Analytical solution for ultimate embedment depth and potential holding capacity of plate anchors”. Geotechnique, 65(6), 517-530. DOI: 10.1680/geot./14-P-228. Download
[J28]Fu, D., Gaudin, C., Tian, Y., Bienen, B. and Cassidy, M.J. (2015) “Effects of Drained Preloading on the Bearing Capacity of Footings on Normally Consolidated Clay”. Geotechnique, 65(3), 231-246. Download
[J27]Tian, Y., Youssef, B.S. and Cassidy, M.J.  (2015) “Assessment of Pipeline Stability in the Gulf of Mexico during Hurricanes Using Dynamic Analysis”. Theoretical & Applied Mechanics Letters, 5(2), 74-79. http://dx.doi.org/10.1016/j.taml.2015.02.002 . Download
[J26]Tian, Y., Cassidy, M.J. and Chang, C.K. (2015) “Assessment of Offshore Pipeline using Dynamic Lateral Stability Analysis”. Applied Ocean Research,  50, 47-57, DOI: 10.1016/j.apor.2015.01.001. Download
[J25]Wang, D., Bienen, Nazem, M., Tian, Y., Zheng, J., Pucker, T. and Randolph, M.F. (2015) “Large Deformation Finite Element Analyses in Geotechnical Engineering”. Computer and Geotechnics, 65, 104-114, doi:10.1016/j.compgeo.2014.12.005. Download
[J24]Li, J., Tian, Y. and Cassidy, M.J. (2015) “Failure Mechanism and Bearing Capacity of Footings Buried at Various Depths in Spatially Random Soils”. Journal of Geotechnical and Geoenvironmental Engineering, 141(2), 04014099. DOI:10.1061/(ASCE)GT.1943-5606.0001219. Download
[J23]Tian, Y., Gaudin, C. Randolph, M.F. and Cassidy, M.J. (2015) “The Influence of Padeye Offset on the Bearing Capacity of Three Dimensional Plate Anchors”. Canadian Geotechnical Journal, 52(6): 682-693. DOI: 10.1139/cgj-2014-0120. Download
[J22]Wei, Q., Cassidy, M.J., Tian, Y. and Gaudin, C. (2015) “Incorporating Shank Resistance into Prediction of the Keying Behaviour of SEPLAs.” Journal of Geotechnical and Geoenvironmental Engineering. 141(1), 04014080, DOI:10.1061/(ASCE)GT.1943-5606.0001193 Download
[J21]Gaudin, C., O’Loughlin, C.D., Randolph, M.F., Cassidy, M.J., Wang, D., Tian, Y., Hambleton, J.P. and Merifield, R.S. (2014) “Advances in offshore and onshore anchoring solutions.” Australian Geomechanics, 49(4), 59-71. Download
[J20]Yuan, F., Randolph, M.F., Wang, L., Zhao, L. and Tian, Y. (2014) “Refined analytical models for pipe-lay on elasto-plastic seabed”. Applied Ocean Research, 48, 292-300. Doi:10.1016/j.apor.2014.10.003. Download
[J19]Tian, Y., Cassidy, M.J. and Gaudin, C. (2014) “The Influence of Padeye Offset on Plate Anchor Re-embedding Behaviour”. Géotechnique Letters, 4(1) 39-44, http://dx.doi.org/10.1680/geolett.13.00056. Download
[J18]Tian, Y., Cassidy, M.J., Randolph, M.F., Wang, D. and Gaudin, C. (2014) “A Simple Implementation of RITSS and Its Application in Large Deformation Analysis.” Computers and Geotechnics, 56, 160-167. Download
[J17]Tian, Y., Gaudin, C. and Cassidy, M.J. (2014) “Improving Plate Anchor Design with a Keying Flap.” Journal of Geotechnical and Geoenvironmental Engineering, 140(5), 04014009, DOI:10.1061/(ASCE)GT.1943-5606.0001093. Download
[J16]Li, X., Gaudin, C., Tian, Y. and Cassidy, M.J. (2014) “The Effect of Perforation on the Uplift Capacity of Skirted Foundation on Clay”. Canadian Geotechnical Journal, 51(3): 322-331, doi: 10.1139/cgj-2013-0110. Download
[J15]Li, S., Tian, Y., Zhou, Y., Jiang, B. and Wang, J. (2013) “Premature Refusal of Large-diameter, Deep-penetration Piles on an Offshore Platform.” Applied Ocean Research. 42, 55-59 Download
[J14]Tian, Y. and Cassidy, M. J. (2013). “Equivalent Absolute Lateral Static Stability of on-Bottom Offshore Pipelines”. Australian Geomechanics: Special Issue on Offshore Geotechnics. 48(4), 59-70. Download
[J13]Youssef, B., Tian, Y. and Cassidy, M.J. (2013) “Centrifuge Modelling of On-bottom Pipeline under Wave and Current Loading.” Applied Ocean Research, 40, 14-25. Download
[J12]Youssef, B., Cassidy, M.J. and Tian, Y. (2013) “Statistical Analysis Techniques in the Pipeline On-bottom Stability Analysis.” Journal of Offshore Mechanics and Arctic Engineering, 135(3), 031701 Download
[J11]Cassidy, M.J., Uzielli, M. and Tian, Y. (2013) “Probabilistic Combined Loading Failure Envelopes of a Strip Footing on Spatially Variable Soil.” Computers and Geotechnics. 49, 191–205 Download
[J10]Tian, Y., Gaudin, C., Cassidy, M.J. and Randolph, M.F. (2013). “Considerations on the Design of Keying Flap of Plate Anchors.” Journal of Geotechnical and Geoenvironmental Engineering ASCE, 139(7): 1156-1164 Download
[J9]Cassidy, M. J. and Tian, Y. (2012). “Development and application of models for the stability analysis of Australia’s offshore pipelines”. Australian Geomechanics, 47(2), 61-78. Download
[J8]Cassidy, M.J., Gaudin, C., Randolph, M.F., Wong, P., Wang, D. and Tian, Y. (2012). “A Plasticity Model to Assess the Keying of Plate Anchors.” Géotechnique, 62(9), 825-836 Download
[J7]Tian, Y., Cassidy, M.J. and Youssef, B.S. (2011). “Consideration for on-bottom stability of unburied pipelines using a dynamic fluid-structure-soil simulation FE program.” International Journal of Offshore and Polar Engineering, 21(4):308-315 Download
[J6]Tian, Y., and Cassidy, M. J. (2011). “Incorporating uplift in the analysis of shallowly embedded pipelines.” Structural Engineering and Mechanics, 40(1): 29-48 Download
[J5]Tian, Y. and Cassidy, M. J. (2011). “A Pipe-Soil Interaction Model Incorporating Large Lateral Displacements in Calcareous Sand.” Journal of Geotechnical and Geoenvironmental Engineering ASCE 137(3): 279-287. Download
[J4]Tian, Y., Cassidy, M. J. and Gaudin, C. (2010). “Advancing Pipe-Soil Interaction Models through Geotechnical Centrifuge Testing in Calcareous Sand.” Applied Ocean Research 32(3): 294-297. Download
[J3]Tian, Y., and Cassidy, M. J. (2010). “The Challenge of Numerically Implementing Numerous Force-Resultant Models in the Stability Analysis of Long On-Bottom Pipelines.” Computers and Geotechnics, 37(1-2), 216-312. Download
[J2]Tian, Y., and Cassidy, M. J. (2008). “Modelling of Pipe-Soil Interaction and Its Application in Numerical Simulation.” Int. J. Geom., 8(4), 213-229. Download
[J1]Yan, S., Tian, Y., Liu, R., Wang, Z. and Wang, J. (2006). “Analysis on Interface Shear Stress of Thermally Insulated Ocean Pipelines under Installation.” China Ocean Engineering 20(2): 315-323 Download
Conference papers:
[C28]Castelo, A., White, D.J. and Tian Y. (2017). “Solving downslope pipeline walking on non-linear soil with brittle peaks and strain softening”. The 27th International Ocean and Polar Engineering Conference. San Francisco, California, USA Download
[C27]Fiumana N., Gaudin C., Tian Y. (2017). Active suction anchors for floating renewable energy devices. Proceedings of the 17th European Wave and Tidal Energy Conference, Cork, Ireland Download
[C26]Zhao, X., Luan, Y., Zhang, C., Tian, Y. and Huang, X.(2017) “Experimental and numerical study of pipelines shallowly embedded in sands”. Offshore Site Investigation and Geotechnics, London, UK Download
[C25]Gaudin, C., Li, X., Tian, Y. and Cassidy, M.J.(2017) “About the Uplift Resistance of Subsea Structures”. Proceedings of the 19th International Conference on Soil Mechanics and Geotechnical Engineering, Seoul, South Korea Download
[C24]Niemann, C., Tian, Y., O’Loughlin, C.D., .Cassidy, M.J., and Reul, O. (2017) “Response of Piles under Cyclic Lateral Loading – Centrifuge Tests”. Proceedings of the 19th International Conference on Soil Mechanics and Geotechnical Engineering, Seoul, South Korea Download
[C23]Gaudin, C., Cassidy, M.J., O’Loughlin, C.D., Tian, Y., Wang, D. and Chow, S. (2016) “Recent Advances in Anchor Design for Floating Structures”. Proceedings of the 12th ISOPE Pacific/Asia Offshore Mechanics Symposium, Gold Coast, Australia Download
[C22]Zheng, T., Cassidy, M.J., Tian, Y. and Gaudin, C. (2016) “Yield Surface of Deeply Buried Square Anchors under Out-Of-Plane Loading”. Proceedings of the ASME 2016 35rd International Conference on Ocean, Offshore and Arctic Engineering, Busan, South Korea Download
[C21]Tian, Y., Zheng, T., Zhou, T. and Cassidy, M.J. (2016) “A new method to investigate the failure envelopes of offshore foundations”. Proceedings of the ASME 2016 35rd International Conference on Ocean, Offshore and Arctic Engineering, Busan, South Korea Download
[C20]Zhang, W., Cassidy, M.J. and Tian, Y. (2015) “3D Large Deformation Finite Element Analyses of Jack-up Reinstallations Near Idealised Footprints”. International Conference: The Jack-Up Platform – Design, Construction & Operation, City University London, UK Download
[C19]Li, J., Tian, Y. and Cassidy, M.J. (2015) “Effect of Spatial Variability on Buried Footings”. the 5th International Symposium on Geotechnical Safety and Risk, Rotterdam, the Netherlands. doi:10.3233/978-1-61499-580-7-810 Download
[C18]Gaudin, C., Tian, Y., Cassidy, M.J., Randolph, M.F., Wang, D. and O’Loughlin, C.D. (2015) “Design and performance of suction embedded plate anchors” The 3rd International Symposium on Frontiers in Offshore Geotechnics. Oslo, Norway. Download
[C17]Wei, Q., Tian, Y., Cassidy, M.J., Gaudin, C. and O’Loughlin, C.D. (2015) “Behaviour of OMNI-Max anchors under chain loading” The 3rd International Symposium on Frontiers in Offshore Geotechnics. Oslo, Norway. Download
[C16]Li, J., Cassidy, M.J., Tian, Y., Huang, J., Lyamin, A. and Uzielli, M. (2014) “Comparative study of bearing capacity of buried footings using random limit analysis and random finite element method” The 14th International Conference of the International Association for Computer Methods and Advances in Geomechanics. Kyoto, Japan. Download
[C15]Cheng, N., Cassidy, M.J. and Tian, Y. (2014) “Numerical Study of the Combined Loading Envelope of a Skirted Spudcan Foundation” Proceedings of the ASME 33rd International Conference on Ocean, Offshore and Arctic Engineering. San Francisco, USA. Download
[C14]Li, X., Tian, Y., Cassidy, M.J. and Gaudin, C. (2014) “Sustained Uplift of Skirted Foundation in Clay” Proceedings of the 33rd International Conference on Ocean, Offshore and Arctic Engineering OMAE2014. San Francisco, USA. Download
[C13]White, D.J., Westgate, Z.J. and Tian, Y. (2014) “Pipeline Lateral Buckling: Realistic Modelling of Geotechnical Variability and Uncertainty” Offshore Technology Conference held in Houston, Texas, USA. Download
[C12]Li, X., Gaudin, C., Cassidy, M.J. and Tian, Y. (2014) “Loading rate effects on the uplift of skirted foundations in clay” The 8th International Conference on Pysical Modelling in Geotechnics. Download
[C11]Tian, Y., Cassidy, M.J. and Uzielli, M. (2013) “Probabilistic Assessment of the Bearing Capacity of Shallow Strip Footings on Stiff-Over-Soft Clay.” The 18th International Conference on Soil Mechanics and Geotechnical Engineering, Paris Download
[C10]Wong, P., Gaudin, C., Randolph, M.F., Cassidy, M.J. and Tian, Y. (2012) “Performance of Suction Embedded Plate Anchors in Permanent Mooring Applications.” The 22th International Offshore (Ocean) and Polar Engineering Conference: Rhodes, Greece. Download
[C9]Tian, Y. and Cassidy, M.J. (2012). “Developing a Dynamic Lateral Stability Analysis Package for Offshore Pipelines on Calcareous Sand”. Subsea Australasia Conference, Perth, Australia Download
[C8]Cassidy, M.J. and Tian, Y. (2011). “Development and application of models for the stability analysis of Australia’s offshore pipelines”. Proc. 2011 Symposium on Coastal and Marine Geotechnics: Foundations for Trade, the 15th Annual Australian Geomechanics Society Sydney Chapter Symposium, Sydney, Australia (invited keynote lecture) Download
[C7]Youssef, B.S., Cassidy, M.J. and Tian, Y. (2011). “Probabilistic Model application in the integrated stability Analysis of Offshore on-bottom pipeline”. 30th International Conference on Ocean, Offshore and Arctic Engineering, OMAE950047, Rotterdam, Netherlands Download
[C6]Tian, Y., Wang, D. and Cassidy, M. J. (2011). “Large Deformation Finite Element Analysis of Offshore Penetration Tests”. The Second International Symposium on Computational Geomechanics (ComGeo II): 925-933, Cavtat-Dubrovnik, Croatia. Download
[C5]Tian, Y., Cassidy, M. J., and Youssef, B. S. (2010). “Consideration for on-bottom stability of unburied pipelines using force-resultant models.” The 20th International Offshore (Ocean) and Polar Engineering Conference: 212-219, Beijing, China. Download
[C4]Youssef, B. S., Cassidy, M. J. and Tian, Y. (2010). “Balanced Three-Dimensional Modelling of the Fluid-Structure-Soil Interaction of an Untrenched Pipeline”. Proceeding of the 20th International Offshore (Ocean) and Polar Engineering Conference: 123-130, Beijing, China. Download
[C3]Tian, Y., and Cassidy, M. J. (2009). “Pipe-soil interaction analysis with a three-dimensional macroelement model.” The 19th International Offshore (Ocean) and Polar Engineering Conference: 2, 461-468, Osaka, Japan. Download
[C2]Tian, Y., and Cassidy, M. J. (2008). “A Practical Approach to Numerical Modeling of Pipe-Soil Interaction.” The 18th International Offshore (Ocean) and Polar Engineering Conference: 2, 533-538, Vancouver, BC, Canada. Download
[C1]Tian, Y. and Cassidy, M. J. (2008). “Explicit and Implicit Integration Algorithms for an Elastoplastic Pipe-Soil Interaction Macroelement Model”. The 27th International Conference on Offshore Mechanics and Arctic Engineering, OMAE2008-57237, Estoril, Portugal. Download
To be published:
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Remote desktop problem with Abaqus screen resolution for python batch processing

Did not solve this problem yet. Just bookmark the below two pages for later use:
https://blog.brankovucinec.com/2016/03/19/fix-remote-desktop-dpi-scaling-issues/
http://www.sqlchick.com/entries/2011/12/18/how-to-perfect-the-resolution-of-a-remote-desktop-session.html

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extract field data

did not get automatic extraction running

just the manual method, anyway it works

#manually open odb and change the belwo to extract
from abaqusConstants import *
myodb=’E:/CurrentProjects/LDFEUltimateState/4-CPE4R-SmoothThetaa-20X20B/UniaxialCapacity/theta=89.odb’
odb = session.openOdb(name=myodb)
myfile = ‘E:/CurrentProjects/LDFEUltimateState/4-CPE4R-SmoothThetaa-20X20B/UniaxialCapacity/theta=89.txt’
session.xyDataListFromField(odb=odb, outputPosition=NODAL, variable=((‘RF’,  NODAL, ((COMPONENT, ‘RF1’), (COMPONENT, ‘RF2’), )), (‘U’, NODAL, (( COMPONENT, ‘U1’), (COMPONENT, ‘U2’), )), ), nodeSets=(‘SETRPPADEYE’, ))
x0 = session.xyDataObjects[‘RF:RF1 PI: ASSEMBLY N: 1’]
x1 = session.xyDataObjects[‘RF:RF2 PI: ASSEMBLY N: 1’]
x2 = session.xyDataObjects[‘U:U1 PI: ASSEMBLY N: 1’]
x3 = session.xyDataObjects[‘U:U2 PI: ASSEMBLY N: 1’]
session.writeXYReport(fileName=myfile, appendMode=OFF, xyData=(x0, x1,  x2, x3))

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ABAQUS display windows disappeared

Strangely ABAQUS display windows disappeared.
The reason was just become drag to another screen with different resolution, where the python script windows was enlarged for coding. When drag back or restart on the main screen. All display windows disappeared.
Waste quite a bit time finding method to restore.
Just pull back to that screen and adjust the python code window size.

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Transition mesh with equal ratio serial

lenL=xPoint[5]-C2[0]
lenR=C3[0]-xPoint[5]
hmax=2.
hmin=0.5
ratio=hmax/hmin
NL=int(np.log(ratio)/np.log((lenL-hmin)/(lenL-hmin*ratio))+1.)
NR=int(np.log(ratio)/np.log((lenR-hmin)/(lenR-hmin*ratio))+1.)
hminL=lenL*(ratio**(1./(NL-1))-1.)/(ratio**(NL/(NL-1.))-1.)
hminR=lenR*(ratio**(1./(NR-1))-1.)/(ratio**(NR/(NR-1.))-1.)
qL=ratio**(1./(NL-1.))
qR=ratio**(1./(NR-1.))
xpt=xPoint[5]
for j in range(NL-1):
hstep=hminL*qL**j
mdb.models[‘Model-1’].sketches[‘__profile__’].Line(point1=(xpt,C2[1]), point2=(xpt-hstep,C2[1]))
xpt=xpt-hstep

mdb.models[‘Model-1’].sketches[‘__profile__’].Line(point1=(xpt,C2[1]), point2=C2)
xpt=xPoint[5]
for j in range(NR-1):
hstep=hminR*qR**j
mdb.models[‘Model-1’].sketches[‘__profile__’].Line(point1=(xpt,C2[1]), point2=(xpt+hstep,C2[1]))
xpt=xpt+hstep

mdb.models[‘Model-1’].sketches[‘__profile__’].Line(point1=(xpt,C2[1]), point2=(C3[0],C3[1]))

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What is the “hourglass effect” in finite element analysis? How does the reduced integration, resulting in the hourglass effect, work? How can we counter the hourglass effect?

https://www.quora.com/What-is-the-hourglass-effect-in-finite-element-analysis-How-does-the-reduced-integration-resulting-in-the-hourglass-effect-work-How-can-we-counter-the-hourglass-effect

What is hourglassing?

It is essentially a spurious deformation mode of a Finite Element Mesh, resulting from the excitation of zero-energy degrees of freedom. It typically manifests as a patchwork of zig-zag or hourglass like element shapes (Fig.1), where individual elements are severely deformed, while the overall mesh section is undeformed. This happens on hexahedral 3D solid reduced integration elements and on the respective tetrahedral 3D shell elements and 2D solid elements.

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e-lnp

e-lnp.png

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Contact problem with sharp tip

A sharp tip (CPT) penetrates into soil. ABAQUS
Node-surface interaction works well both small-sliding and finite-sliding.
Surface-surface interaction works in case of small-sliding but in case finite-sliding of surface-surface contact (the default option) there is no result (seem no contact established and the cone penetrates without any interaction between the soil.
Still can not work out the reason. Keep here as note.

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