As a total solution specialized for the detail and nonlinear analysis of civil structures, MIDAS/FEA supports various analysis functions as follows:

• Linear Static Analysis
• Construction Stage Analysis
• Modal Analysis
• Linear Buckling Analysis
• Transient / Frequency / Spectrum Response Analysis.
• Material / Geometry Nonlinearity Analysis
• Interface Nonlinearity Analysis
• Reinforcement / Pile Analysis
• Concrete Cracking Analysis
• Heat Transfer Analysis
• Heat of Hydration Analysis
• Contact Analysis
• Fatigue Analysis
  

MIDAS/FEA supports various stable iteration methods for nonlinear equation solving and the corresponding options.

• Full Newton-Raphson Method
• Modified Newton-Raphson Method
• Arc-Length Method
• Displacement Control Method
• Constant Stiffness Method
  

MIDAS/FEA also provides the following nonlinear behavior control options:

• Isotropic / Kinematic / Mixed Hardening (Multi-Linear, Nonlinear)
• Softening (Brittle, Multi-Linear, Nonlinear)

MIDAS/FEA includes various elements for structural and non-structural modeling as follows:

MIDAS/FEA supports the following material models for steel and concrete structures.

• General Material Models
  - von Mises
  - Tresca
  - Mohr-Coulomb
  - Drucker-Prager
  - Rankine
  _ Masonry
  - User-Supplined Material (FORTRAN Format)
  
  
• Interface Models
  - Coulomb Friction
  - Discrete Cracking
  - Crack Dilatancy
  - Bond-Slip
  - Combined Cracking-Shearing-Crushing
  
  
• Visco-Elastic Models
  - Kelvin
  - Creep-Shrinkage (Design Code)
  - Temperature-Dependent Material
  
  
• Concrete Cracking Models
  - Total Strain Crack
  - Smeared Crack
  
  

Usage of User-Supplied Material (Nonlinear Elastic Material for Solid Element)

In MIDAS/FEA, users can apply loads and boundary conditions not only to Nodes and Elements but also to geometry entities such as Surface and Curve. Therefore, it enables to configure complex load and boundary conditions in FEM model very easily.

• MIDAS/FEA provides various load conditions as follows:
• Body Force
  
• Force / Moment
  
• Nodal Mass
  
• Displacement
  
• Velocity
  
• Acceleration
  
• Pressure
  
• Beam Load
  
• Pre-stress
  
• Temperature
  
• Heat Generation
  
• Heat Flux
  
• Temperature Gradient
  
• Time Forcing Function (including 54 earthquake acceleration records)
  
• Time Varying Load
  
• Ground Acceleration
  
• Response Spectrum Function
  

For user’s convenience, MIDAS/FEA provides arbitrary loading functions which can be applied to arbitrary locations/areas regardless of node and/or element connection.

MIDAS/FEA provides various boundary conditions as follows:

• Constraint
  
• Muiti-Point Constraints
  
• Beam Offset
  
• Plate Offset
  
• Beam-End Release
  
• Convection
  
• Contact Conditions
  
  

The load and boundary condition in FEA offers Function and Coordinate System so that various load and boundary conditions can be simply implied to a model.
The Function becomes practical when spatially varying load is applied to a model, and the Coordinate System is conveniently used when configuring specific directional load and/or boundary condition or skew support.

Analysis Case in FEA allows to perform multiple analysis types in a single model. Each Analysis Case can consist of different element definition, loads, and boundary conditions. Therefore, it significantly improves both the analysis condition and the post processing operations.

MIDAS/FEA provides two direct solvers and one iterative solver for solving simultaneous equations.

• Multi-frontal Sparse Gaussian Solver
  
• lock Skyline Solver
  
• Iterative Solver
  - Preconditioned Conjugate Gradient
  - Generalized Minimal Residual
  

The Multi-Frontal solver is one of the fastest solvers for solving large solid models. The Multi-Frontal solver in MIDAS/FEA has been developed on the basis of BLAS and LAPACK, the most famous linear algebra library.