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Title:

Analysis and Design of a Raft Foundation at Kings Place Eleanor Patterson

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Varying soil stiffness (mining) Soil-structure interaction ... 1m raft grillage. Edge condition. Analysis Limitations. Prop forces. Pits. Second Order Effects ... – PowerPoint PPT presentation

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Title: Analysis and Design of a Raft Foundation at Kings Place Eleanor Patterson


1
Analysis and Design of a Raft FoundationatKing
s PlaceEleanor Patterson
2
Contents
  • Raft Foundation
  • Kings Place
  • Analysis
  • GSRAFT
  • Modelling techniques
  • Limitations
  • Design Cases Criteria ULS and SLS
  • Design and Detailing
  • Rationalisation
  • Punching Shear
  • Thick vs. Thin

3
Raft Foundation
  • Shallow foundation system
  • Spreads load over building footprint
  • Usage
  • Low bearing capacity
  • Convenient excavation
  • Varying soil stiffness (mining)
  • Soil-structure interaction
  • Assess feasibility by checking
  • Overall bearing pressure
  • Settlement

4
Kings Place, London
  • 83 storeys
  • 65mx75m
  • Value Engineering

5
Kings Place, London
6
Kings Place plan on raft
7
Kings Place computer model of raft
8
Analysis - GSRaft
  • GSA structural analysis
  • VDISP settlement analysis
  • Iteration and convergence

9
Analysis Modelling Techniques
  • Soil stiffness model
  • 1m raft grillage
  • Edge condition

10
Analysis Limitations
  • Prop forces
  • Pits
  • Second Order Effects
  • Edge Effects
  • Cores

11
Analysis Cases
  • Ultimate Limit State
  • 1.4DL1.6LL (short term)
  • 1.4DL1.6LLHeave (long term)
  • 0.85DLHeave (long term)
  • Serviceability Limit State
  • 1.0DL0.5LL (short term)
  • 0.1DL0.5LLHeave (long term)

12
Analysis Design Criteria
  • SLS
  • Curvature, cracking
  • ULS
  • Reinforcement

13
Analysis-Slab Curvature
14
Design and Detailing Reinforcement
15
Design and Detailing
  • Rationalisation
  • Typical mat throughout
  • Locally enhanced
  • Pits
  • Strut and tie to transfer compression
  • Punching Shear
  • Prefabricated cage with links for ease of
    detailing
  • Thick versus Thin
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