Oasys Siren

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Oasys Siren Sigraph

• Geotechnical seismic analysis
• Stephen Hendry

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Oasys Geotechnical Software

• Piling
• Alp, Drive, Pile
• Soil Movement
• Slope, Vdisp, Tunset
• Retaining Walls
• Frew, Greta, Stawal
• Finite Elements
• Safe
• Seismic
• Siren, Sigraph

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Siren Sigraph

• Geotechnical seismic analysis programs
• Rewrite of existing DOS programs
• Based on ideas developed by Arup over the last 20
  years
• Use on many Arup jobs so
• Proven concepts
• Reliable tools

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Siren

• Site response analysis
• Transient non-linear time history analysis using
  explicit time integration
• Input data
• Soil column
• Bedrock
• Bedrock excitation
• Calculates
• Stress/strain histories in soil
• Acceleration/velocity/displacement of soil

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Siren Model
Soil Surface
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Siren Material Model

• Requirements
• Easily defined parameters
• Fully non-linear model
• Good modelling of hysteresis
• Solution
• Mechanical sub-layer model

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Siren Post-Analysis Options

• Graphic output
• Time histories
• Stress-strain histories
• Relative displacement v depth
• Relative displacement v time
• Response spectra
• Tabular output
• Model and material properties
• Peak response values
• Export to Sigraph for further processing

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Sigraph

• Time-history graphing and manipulation program
• Collects together ideas from a number of DOS
  programs
• GdGraf graphing and basic manipulation
• Synth synthetic time-history generation
• Spec response spectrum generation

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Sigraph Plotting

• Curves
• No limit on the number of curves
• No limit on the number of data points
• Different data types scalar, vector, complex,
• Sigraph understands units associated with
  different curves (e.g. differentiating velocity
  results in acceleration)
• Not necessarily time histories
• Control over the individual curves
• Colour
• Style
• Symbols
• Visibility

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Sigraph Data Manipulation

• Arithmetic
• Addition, subtraction, multiplication, division,
  
• Mathematical
• Sum, mean, square roots,
• Calculus
• Differentiation and integration
• Seismic
• Baseline correction, response spectrum
  generation, synthetic time-history generation
• General
• Interpolation, least squares fit, FFT and inverse
  FFT, filtering,

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Sigraph Response Spectrum Generator
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Sigraph Data Import Generation

• Import of results saved from Siren
• Import from spreadsheet
• Cut/paste tables
• General mathematical curves
• sin(t) - 0.2sin(2t) - 0.1sin(4t)
  0.3sin(6t)

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Siren and Sigraph Timeline

• Siren and Sigraph are being beta tested
• Release due soon

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