Features of the three analysis types used for static design

Tekla Structural Designer
2020
Tekla Structural Designer

Features of the three analysis types used for static design

The following table can be used to compare the features of the three analysis types used in the static design process.

Feature 3D Analysis Grillage Chasedown FE Chasedown
Examples / When useful? Gravity and Lateral analysis (Notional/Wind/Seismic) “Beam & Slab” buildings Flat slab and “Beam & Slab” buildings
Special Features
  • Pattern loading
  • Automatic EC2 sway sensitivity assessment and sway amplification
  • Automatically centralised analysis wires (improved rigid offsets / rigid zones)
  • Option to mesh slabs in the 3D analysis
  • Mimics traditional design approach (sub-frame analysis)
  • Pattern loading
  • Mimics traditional design approach (isolated floor analysis)
  • Slab Pattern loading
Benefits
  • Member Design considers sway and differential axial deformation effects.
  • Caters for slabs that contribute to the lateral load resisting system
Member design based on traditional sub frame is considered simultaneously with that for 3D Analysis
  • Member design based on traditional sub frame is considered simultaneously with that for 3D Analysis
  • Irregular slab panel design automatically catered for
Analysis Model

3D model of entire building:

  • either meshed 2-way slabs,
  • or, slab loads decomposed to beams

series of 3D sub models:

  • all column and wall stacks immediately above and below the sub-model
  • either meshed 2-way slabs,
  • or, slab loads decomposed to beams

series of 3D sub models:

  • all column and wall stacks immediately above and below the sub-model
  • all 2-way slabs meshed
Analysis Method Whole model in one pass Each sub model sequentially from top to bottom – chasing member loads down Each sub model sequentially from top to bottom – chasing member loads down
Analysis Type
  • First order
  • First order - Kamp
  • Second order - P-D
First order First order
Supports External supports as defined by the user Ends of members above/below each sub model are automatically supported Ends of members above/below each sub model are automatically supported
Loading Gravity and Lateral Loads Gravity Loads only Gravity Loads only
Forces for design
RC Slab Yes– All Combs No forces Yes – All Gravity load cases
RC Beam Yes– All Combs Yes – All Gravity load cases Optional – All Gravity load cases
RC Column Yes– All Combs Yes – All Gravity load cases Optional – All Gravity load cases
RC Wall Yes– All Combs Yes – All Gravity load cases Optional – All Gravity load cases
Steel/Composite Members Yes – All Combs except patterns Not required Not required
Foundation design Yes – All Combs except patterns Yes – All Gravity load cases Yes – All Gravity load cases
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