GTS NX is a comprehensive finite element analysis software package
that is equipped to handle the entire range of geotechnical design
applications including deep foundations, excavations, complex tunnel
systems, seepage analysis, consolidation analysis, embankment design,
dynamic and slope stability analysis. GTS NX also has an advanced user
friendly modeling platform that enables unmatched levels of precision
and efficiency. As the next generation geotechnical analysis software, midas GTS
NX features the newest development in cutting-edge computer graphics and
analysis technology. GTS NX fully supports the latest 64-bit OS Graphic
user interface. The intuitive interface will enable new users to easily
integrate the software in their work process. The fast analysis speed,
outstanding graphics, and output capabilities will provide users with a
new and advanced level of geotechnical design.
Linear static analysis assumes ground and rock materials to be
linear-elastic materials and uses static analysis to determine the
behavioral characteristics when loading is applied. Ground materials
only display linear-elastic properties in the early stages of loading,
where only a small strain is generated. However, because Linear-elastic
analysis does not consider failure and idealizes the stress-strain
relationship linearly,it is widely used for simple analysis, such as
identifying the stress distribution or concentration in the in-situ
ground. In a broad sense, linear behavior can be viewed as a special form of
nonlinear behavior but because linear analysis is convenient and
intuitive, linear static analysis is categorized as a separate analysis
type. Linear analysis, including Linear dynamic analysis, utilizes the
elastic behavior of a defined material for analysis. Also, the
non-linear behavior (tension only, compression only and non-linear
elastic behavior) of elastic link elements or truss elements are ignored
and the elements are used in the analysis as elastic bodies.
Consequently, it is useful to use Linear static analysis to observe the
approximate behavior of the ground, to organize the initial stage
conditions of the construction stage or to conduct tunnel lining
analysis. Particularly, Linear static analysis does not require recursive
calculations and hence, it has a short calculation time. GTS NX
considers pore pressure in Linear-static analysis and drained and
undrained conditions can be assigned to elastic materials for analysis.
All physical phenomena includes non-linearity. Ground or structural
behaviors are not an exception. Non-linear static analysis is used to
simulate the behavior of ground considering such non-linearity, when the
change with time is small and can be ignored. GTS NX considers the
following non-linearity.
Non-linearity of material : This occurs when the stress-strain
relationship is non-linear. Most ground materials have this
non-linearity.
Geometric non-linearity: If the displacement-strain relationship is
non-linear, the linear assumption is no longer applicable when the
displacement is large, or the rotational deformation is large.
Non-linearity of load and boundary: Non-linearity that includes the
non-linear behavior at an interface, or non-linearity caused by the
direction change of a load due to strain, caused by forces such as the
follower force. GTS NX can consider all non-linearity mentioned above in analysis.
Non-linear analysis can take a long time for complex non-linear systems
because repeated calculations are conducted. Hence for the practicality,
considering appropriate non-linearity can result in analysis results
that simulate non-linear behavior, while maintaining the accuracy with
little computational cost.