บุญมี ชินนาบุญ. A BEM-Based Meshless Method for Plates on Biparametric Elastic Foundation with Internal Supports. Doctoral Degree(Civil Engineering). King Mongkut's University of Technology Thonburi. KMUTT Library.. : King Mongkut's University of Technology Thonburi, 2008.
A BEM-Based Meshless Method for Plates on Biparametric Elastic Foundation with Internal Supports
Abstract:
In this dissertation, a BEM-based meshless method is developed for the analysis of
plates on a biparametric elastic foundation which, in addition to the boundary supports,
are also supported inside the domain on isolated points (a group of plies) and/or line
supports (continuous plates). In the analysis, the normal bending moment of the plate is
assumed to be a linear function of the boundary slope which is recognized as a kind of
support model with rotational restraint. Thus, the solution can be treated all cases
ranging from simple support to complete fixity of the boundary. The presented solution
is a "boundary-only" method using the concept of the Analog Equation Method (AEM),
which retains all the advantages of the pure BEM. The background cells for integration
are not necessitated for the developed method. According to the concept of the AEM,
the original governing differential equation is replaced by an equivalent problem for
plates with internal supports not resting on an elastic foundation subjected to an
"appropriate" fictitious load under the same boundary conditions. The fictitious load is
established using a technique based on BEM and approximated by using the radial basis
functions. In this study, Multiquadrics (MQs) and Thin Plate Splines (TPSs) are
employed as approximation functions due to their excellent properties for interpolation.
The solution of the actual problem is obtained from the known integral representation of
the solution for the classical plate bending problem, which is derived using the
fundamental solution of the biharmonic equation. Thus, the kernels of the boundary
integral equations are conveniently established and evaluated. To validate its
effectiveness, accuracy as well as applicability of the proposed method, numerical
results of various problems are presented and compared with those available from
analytical and other numerical solutions.