Major outcomes of the FLIP research committee phase 1 (June 1997 through May 2001) are as follows:

Upgrading of FLIP program

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phriFLIP(Ver.3.3) was upgraded as follows:

FLIPSIM: pre-processor for determining soil model parameters

FLIPGEN: pre-processor for mesh generation and run

Selective Reduced Integration Method (SRI)

Nonlinear beam element

Stage-by-stage analysis

Viscous element at lateral boundaries (improvement)

Element-wise input of thickness of 2D element

Automatic determination of stabilization parameters AA, BB for assigning fictitious confining stress for soil at or near non-confining stress state

Rayleigh damping matrix (improvement)

Combination of c & phi input for specifying shear strength of soil

Temp method: adjustment for plastic shear work increment for the stress path beyond the phase transformation line

Other improvements

Advanced applications

The committee hosted the following working groups for advanced applications and state-of-the-practice.

Parameter study on one dimensional analysis of Kushiro-port site Parameter study on damage to RF3 quay wall at Rokko-Island, Kobe Modeling of treated soils by sand compaction piles Modeling of sheet pile quay walls Modeling of rubble stones Modeling of embankments (No.2) Modification of constitutive equation

Results of the research work through these working groups were summarized as the research reports to the members of the FLIP research committee. Some of the results were made available to the wider area of engineers and researchers as follows:

Short list of references in English (long list of references are available in Japanese HP)

1）	Miwa, S., Nozu, M., Ozutsumi, O., Iai, S., Yashima, A., Yasuda, S.: Effective Stress Analysis for Evaluating the Effect of the Sand Compaction Pile Method during the 1995 Hyogoken-Nambu Earthquake", Proceedings of 4th International Conference on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics, 2001.03
2）	Shimazu, T., Sato, S., Ikeda, T., Ozutsumi, O. and Iai, S.: Analytical study of shaking table tests on effect of steel sheet pile walls for embankments: Analysis by "FLIP", Proc. of the 10th international conference on soil dynamics and earthquake engineering (extended abstract), 2001.10

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