NANSSI is a program for analysis of two-dimensional nonlinear dynamic interactions using the effective stress method. It is intended for nonlinear dynamic soil-structure interaction problems that take into account variations in excess pore water pressure.
Plane strain elements, beam elements, spring elements, joint elements
Constitutive law of plane strain elements
|Modified Ramberg-Osgood model
Modified Hardin-Drnevich model
Restoring force characteristics of beam elements
General trilinear type, degrading trilinear type, retrograde type, origin-oriented type, maximum point-oriented type, bilinear slip type
Lateral viscous boundary, lateral superposition boundary, bottom viscous boundary
|Name of program||Features||Remarks|
|NANSSI/1D||One-dimensional nonlinear seismic response analysis||Determination of liquefaction of stratified soil|
|NANSSI/2D||One- and two-dimensional nonlinear seismic response analysis (seismic response and point excitation analysis)||Determines liquefaction in a two-dimensional model, taking into account the nonlinearity of the structure|
|STATIC||One- and two-dimensional nonlinear static analysis (excavation, backfill, and dead load analysis)||Nonlinear analysis by the load incremental method, analysis of initial stress field|
|NAPOST1||Output of spatial distribution maps of deformation, stress, strain, etc.||Supports NANSSI/2D and STATIC|
|NAPOST2||Output of time histories of acceleration, velocity, displacement, etc.||Supports NANSSI/1D, NANSSI/2D, and STATIC|
|PROPERTY||Assistance with setting material constants in nonlinear models||Supports Nishi, Duncan-Chang, Cam-Clay, Nishi-Esashi, and other models|
* NANSSI was developed jointly by Kozo Keikaku Engineering Inc. and Jishin Kogaku Kenkyusho, Inc.