gtstrudl user’s group base plate analysis june 23, 2011 parimal gandhi, pe sr. engineer 1 annual...
DESCRIPTION
AGENDA 1. INTRODUCTION AND THEORY 2. BASE PLATE MODELING 3. EDIT THE BASE PLATE INPUT FILE 4. BASE PLATE STRESSES & BOLTS LOADS 5. FLEXIBLE & RIGID BASE PLATE RESULTS 6. CONCLUSION 3TRANSCRIPT
GTSTRUDL User’s GroupGTSTRUDL User’s Group
BASE PLATE ANALYSIS
June 23, 2011Parimal Gandhi, PE
Sr. Engineer1
Annual Meeting - 2011Annual Meeting - 2011
PURPOSE
Non-Linear Finite Element Analysis For Base Plate.
AND
Stiffness Analysis For Base Plate.
2
AGENDA
1. INTRODUCTION AND THEORY
2. BASE PLATE MODELING
3. EDIT THE BASE PLATE INPUT FILE
4. BASE PLATE STRESSES & BOLTS LOADS
5. FLEXIBLE & RIGID BASE PLATE RESULTS
6. CONCLUSION3
Introduction & Theory
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The finite element method is used to analyze the base plate considering the beam on elastic foundation.
The concrete and bolts are represented by non linear spring elements attached to the nodal points on the steel base plate and to the ground.
The steel base plate is modeled with SBHQ6 and SBHT6 plate bending element.
Attachments and Stiffeners are modeled as RIGID SOLIDS in the plane of the base plate.
Introduction & Theory
The Beam on Elastic Foundation5
Introduction & Theory
Non Linear Spring Element
Concrete
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Introduction & Theory
Non Linear Spring Element
Bolt
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Introduction & Theory
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Non-linear Spring Curves
Base Plate Modeling
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Base Plate Modeling
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Circular Base Plate Modeling
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Circular Base Plate Modeling
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Circular Base Plate Modeling
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Circular Base Plate Modeling
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Circular Base Plate Modeling
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Circular Base Plate Modeling
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Circular Base Plate Modeling
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Circular Base Plate Modeling
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Elements=24x12=288
Joints=289
Joint 289Element 288
Edit Base Plate Input FileThe GT Model Wizard creates a GTSTRUDL input file that remains after the Wizard is closed.
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Edit Base Plate Input FileSoil Spring Values
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Edit Base Plate Input FileFor Attachment
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Master Joint ‘C1’
Slave Joints 74 to 97
Edit Base Plate Input FileFor Concrete Stiffness
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Edit Base Plate Input FileFor Concrete Stiffness
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Edit Base Plate Input FileFor Bolt Stiffness
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Edit Base Plate Input FileFor Bolt Stiffness
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Edit Base Plate Input File
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LOADING
Output
Non Linear Analysis
Base Plate Stresses
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Bolt Support Reactions
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Square /Rectangular Base Plate Modeling
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Square /Rectangular Base Plate Modeling
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Square /Rectangular Base Plate Modeling
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Square /Rectangular Base Plate Modeling
Base Plate odeling
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Square /Rectangular Base Plate Modeling
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Square /Rectangular Base Plate Modeling
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Square /Rectangular Base Plate Modeling
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Square /Rectangular Base Plate Modeling
Base Plate Modeling
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Square /Rectangular Base Plate Modeling
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Square /Rectangular Base Plate Modeling
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Square /Rectangular Base Plate Modeling
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Square /Rectangular Base Plate Modeling
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Square /Rectangular Base Plate Modeling
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Square /Rectangular Base Plate Modeling
Total Joints =169
Total Elements =144
zX
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Square /Rectangular Base Plate Modeling
Master Joint ‘C1’
Slave Joints 57, 61 … 113
Spring Element ‘S1’ Spring Element
‘S169’
Edit Base Plate Input File
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``
LOADING
Output
Non Linear Analysis
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Square /Rectangular Base Plate Stresses
B1 B2
B3 B4
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Support Reactions for Bolts
Edit Rigid Base Plate Input File
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``
Rigid Attachment
Output
Bolt : Pinned Support
``
``
Stiffness Analysis
Loading
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Flexible & Rigid Base Plate Result
Non-Linear Base Plate AnalysisWith Concrete &
Bolt Stiffness
Linear/Stiffness Base Plate AnalysisWithout Concrete
& Bolt StiffnessMaximum Bolt
Pull outMaximum Shear
LoadBase Plate Stresses
Base Plate Displacement
339 lbs 423 lbs
949 lbs 949 lbs
9215 psi 9404 psi
Δy=0.00361” Δy=0.00432”
Flexible Rigid
Questions?Questions?
Thank you.Thank you.
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