|FLIP Consortium is engaged in research and development concerning improvement, function enhancement and application technology of computer programs for analysis of large deformation of structures caused by liquefaction (FLIP ROSE®, FLIP TULIP® and related programs).|
Studies on advanced application technology of FLIP ROSE are performed by
the following working groups.
【History of working groups and their research and development】
|Name of working group (WG)：||Research and development：|
|WG for analysis of Tohoku-Pacific Ocean Earthquake||Investigation on applicability of cocktail glass model to liquefaction analysis in practice by considering the effect of pore water flow in practice|
|WG for studies on behavior of pile in axial direction||Development of three dimensional liquefaction analysis method which can deal with various structural members, and modeling of its two dimensional analysis in practical use|
|WG for modeling of cohesive soil||Development of methodologies for setting parameters under various ground conditions including cohesive soil ground|
|WG for large deformation analysis||Large deformation analysis which can deal with various structure members|
FLIP consortium has engaged in the following research and development.
Conventionally undrained analysis has been the major practice of liquefaction analysis for a short duration earthquake motion. However, after Tohoku-Pacific Ocean Earthquake 2011, the needs for analysis of liquefaction during earthquake motion with a long duration is increasing as a new challenge to face great earthquake.
Simulation by FLIP ROSE 3D
Two dimensional analysis has been mainly applied by adopting a representative cross section of a three dimensional structure for analysis in practical business as conventional use of the FLIP program. As a new trend of analysis using the FLIP program at a practical level, there is an increasing need for three dimensional analysis of soil-structure systems with complicated three dimensional configuration.
Simplified large deformation analysis function had been introduced in the conventional FLIP program. Large deformation analysis program which can consider the effect of geometrical nonlinearity in a rigorous manner is newly implemented in the FLIP program by generalizing the various constitutive models in the framework of the large deformation theory.
FLIP research committee was established in June 1997 following the public
dissemination of FLIP(Ver.3.3) in January7 1997.
The committee aimed at upgrading of FLIP（Ver.3.3）and pursue advanced applications of the program for promoting state-of-the-practice seismic analysis and earthquake resistant design. The committee hosted working groups for the advanced applications of the program, upgrading of FLIP program, debugging and maintenance of FLIP program, and technical support for general enquiry．
The outcomes of FLIP research committees phase 1 (1997-2001), phase 2 (2001-2004), phase 3 (2004- 2007), and phase 4 (2007-2011) are as follows.