Oasys GSA Documentation

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GSA Theory
Notation
Degrees of Freedom
- Active Degrees Of Freedom
- Degrees Of Freedom With No Local Stiffness
Analysis Options
Dynamic Response Analysis
Seismic Calculations
- Response Spectrum Analysis
- Equivalent Static And Accidental Torsion Load
Miscellaneous Calculations
Assemblies
Axes
Composite
- Composite Slabs
- Effective Elastic Properties
Constraints
Direction Cosines
Nodal Axes
Element Axes
Element & Node Properties
2D Element Stresses and Forces
Interpolation on a Triangular/Quad Facet
Loading
Mass Distribution
Material Models
Patterned Load Analysis
RC Slab Design
Rotation at the end of a bar (beam)
Second Moments of Area & Bending
Shear Areas
- Thin Walled Sections
- Solid Sections
Storey Displacements
Sub-model Extraction
Torce Lines
Torsion Constant
Transformations

# Bar And Rod Elements

The bar element stiffness is

The mass matrix is

And the geometric stiffness is

The rod element stiffness is

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