Ground analysis can be explained by comparing it to general structural analysis. Structural analysis gives importance to the uncertainty of load, acting on the structure. Hence, it conducts the member design for the largest member force obtained by combining various results systematically. In contrast, ground analysis focuses more on the uncertainty of construction step and material itself, rather than the load and so, it is important to understand physical state inside the ground. As a result, for ground analysis, solid elements need to be used in modeling to reflect the ground shape and construction situation; and non-linear anisotropic materials and in-situ stress states need to be considered to reflect the actual on-site conditions as much as possible.
The program for ground analysis can be used to simulate in-situ conditions and determine whether design or construction condition is appropriate. For ground analysis, various types of analysis are covered, from General static analysis to Seepage analysis, Stress-seepage coupled analysis, Consolidation analysis, Construction stage analysis, Slope stability analysis etc.
This section provides a brief overview of the analysis methods and descriptions for the analysis options. Refer to the Ch. 5 of the Analysis manual for more detailed information on analysis algorithms.
Create an ‘Analysis Case’ to perform analysis. This step sets the analysis method and the analysis conditions (Mesh set, Boundary condition, Load condition etc.) for each method. In addition, the detailed analysis option and result output option can be adjusted according to each analysis method. For Construction stage analysis in particular, the analysis can be set using the following five different analysis methods and the data used for analysis is specified. The detailed analysis option and result output option can be adjusted and multiple construction stage sets can be set for recursive analysis on a single model with changing analysis conditions.
<Construction state-supported Analysis methods >
Input the Title (and Description) to differentiate each Analysis case and select the Solution (analysis) type. The Analysis Case Model should be defined according to the selected Solution (analysis) type. Only the activated analysis conditions (Mesh, Boundary condition, Load etc.) moved to the Active Sets are reflected in the analysis, not All Sets included in the analysis model. Therefore, it is possible to create several Analysis cases by adjusting the analysis condition on the same model and comparing the results. Especially for Linear static analysis, the [Solve Each Load Set Independently] option can be used to apply all the activated Load Sets individually for recursive analysis and comparison of results.
Particular detailed analysis settings (Time step, Analysis control, Output control) can be added, according to each Solution type (analysis method). Each analysis method has different settings and the settings need to be checked before creating an Analysis Case.
If all sets are reflected in the analysis, use the button to move all conditions to the Active Set. If only several particular conditions are reflected, use drag & drop to move the selected sets to the Active Set. For Construction stage analysis, because the data used for stage-by-stage analysis is already set, select only the sets used to perform the analysis.
Ground analysis can be explained by comparing it to general structural analysis. Structural analysis gives importance to the uncertainty of load, acting on the structure. Hence, it conducts the member design for the largest member force obtained by combining various results systematically. In contrast, ground analysis focuses more on the uncertainty of construction step and material itself, rather than the load and so, it is important to understand physical state inside the ground. As a result, for ground analysis, solid elements need to be used in modeling to reflect the ground shape and construction situation; and non-linear anisotropic materials and in-situ stress states need to be considered to reflect the actual on-site conditions as much as possible.
button to move all conditions to the Active Set. If only several particular conditions are reflected, use drag & drop to move the selected sets to the Active Set. For Construction stage analysis, because the data used for stage-by-stage analysis is already set, select only the sets used to perform the analysis.