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1.
General Features
2.
Detailed Features
3.
Application
4. Modeling Tips
1. General Features
PENTAGON-2D is a finite element analysis
program for 2D continuum
problems including tunnels, earth retaining structures, general
structures, seepage flow and coupling problems etc.
PENTAGON-2D has the feature of considering the staged
construction in any form and in any sequence. You can arrange
your ideas in modeling. Unlike other commercial programs, most
state variables and stiffness coefficients are 8 byte real numbers: this means that the composite materials
of quite different stiffnesses(1E7 times) can be modeled without
any convergence trouble.
Figure. Maximum principal
stress contour of rock tunnel
Element Library and Material Models
PENTAGON-2D contains various
elements such as plane strain (3, 4, 6, 8 nodes), interface,
frame (2 nodes), truss (2 nodes) and spring (2 nodes) elements.
Models of about 5,600 nodes can be solved in 0.5 Mbyte RAM when
the frontal solver is used. The skyline method is also available
for the fast calculation in the main memory. Model size can be
enlarged with RAM or the hard disk capacity. Models:
linear-elastic, Mohr-Coulomb, transversely isotropic, hyperbolic(loading-unloading-reloading) and smeared crack models
are available to model soil, rock, concrete and other various
construction materials. The plane strain, truss and spring
elements have compressive and tensile strength.
Load Conditions and Seepage
Available load conditions are
point load, surface pressure, body force, prestress, and
distributed residual force. Any type of element can be added,
removed and changed of its material at any construction stage and
seepage stage. Seepage analysis is available as the excavation
and embankment stages process.
The steady-state Darcy flow is
available for confined/unconfined flow, saturated/unsaturated
flow. The seepage boundary conditions such as head difference,
pumping, evaporation and precipitation are available for the
different construction stages. For example, as the excavation
process makes the bottom of excavation deeper and deeper, the
discharge surface can be redefined successively. The boundary
condition can be changed at any construction stage. The hydraulic
gradient can be coupled with the mechanics as the form of seepage
force.
Preprocessing and Post-processing
The preprocessor produces the
finite element geometry and the whole input data including the
construction stages such as element addition/removal, boundary
conditions, load, and so on. The postprocessor displays the
graphical results as vector and contour plots in the full GUI
environment. The graphic results can be produced as the Windows
meta file(*.wmf) format, the Postscript format and the Auto-CAD
plot file(*.plt) format.
System Requirements
Hardware environment : Pentium
133MHz, 32MB main memory and 500MB HDD or above recommended.
OS : Windows 95, Windows 98,
Windows NT 4.0 or Windows NT 5.0
2.
Detailed Features
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