ADINA Substructuring in Dynamic Analyses with Local Nonlinearities
In the News of March 30, 2007, we demonstrated the solution efficiency of the ADINA substructuring capability in a static analysis when the analysis involves only local nonlinearities.
In this issue, we perform a dynamic analysis using ADINA 8.4.4(*) with substructuring of the building frame model with the local nonlinearity shown in the March 30 News.
As in the static analysis, the only nonlinearity in this large system is due to the frictional contact between the building and its foundation. A horizontal dynamic load is applied at the bottom of the foundation. Hence, as in the static analysis, most of the building structure can be modeled using a substructure.
The above movies show the response. On the left the complete structure is shown and on the right only the substructure is considered (with the displacement response magnified).
The solution statistics in the table below show that the savings in memory usage and solution time by use of substructuring are very significant. Almost one order of magnitude reduction in solution time is seen.
In the following graph, the time history plot of the transverse displacement at the top of the building is given, obtained with and without substructuring.
Hence, it is seen that the ADINA substructuring capability is a
simple, flexible and effective modeling option that is also
useful for the analysis of nonlinear dynamic problems in
which only local nonlinearities are present.