GTSTRUDL User’s Group BASE PLATE ANALYSIS June 23, 2011 Parimal Gandhi, PE Sr. Engineer 1 Annual Meeting

PURPOSE N on-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. CONCLUSION 3

Introduction & Theory 4  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 Foundation 5

Introduction & Theory Non Linear Spring Element  Concrete 6

Introduction & Theory Non Linear Spring Element  Bolt 7

Introduction & Theory 8 Non-linear Spring Curves

Base Plate Modeling 9

10

Circular Base Plate Modeling 11

Circular Base Plate Modeling 12

Circular Base Plate Modeling 13

Circular Base Plate Modeling 14

Circular Base Plate Modeling 15

Circular Base Plate Modeling 16

Circular Base Plate Modeling 17

Circular Base Plate Modeling 18 Elements=24x12=288 Joints=289 Joint 289 Element 288

Edit Base Plate Input File The GT Model Wizard creates a GTSTRUDL input file that remains after the Wizard is closed. 19

Edit Base Plate Input File Soil Spring Values 20

Edit Base Plate Input File For Attachment 21 Master Joint ‘C1’ Slave Joints 74 to 97

Edit Base Plate Input File For Concrete Stiffness 22

Edit Base Plate Input File For Concrete Stiffness 23

Edit Base Plate Input File For Bolt Stiffness 24

Edit Base Plate Input File For Bolt Stiffness 25

Edit Base Plate Input File 26 LOADING Output Non Linear Analysis

Base Plate Stresses 27

Bolt Support Reactions 28

29 Square /Rectangular Base Plate Modeling

30 Square /Rectangular Base Plate Modeling

31 Square /Rectangular Base Plate Modeling

32 Square /Rectangular Base Plate Modeling

Base Plate odeling 33 Square /Rectangular Base Plate Modeling

34 Square /Rectangular Base Plate Modeling

35 Square /Rectangular Base Plate Modeling

36 Square /Rectangular Base Plate Modeling

Base Plate Modeling 37 Square /Rectangular Base Plate Modeling

38 Square /Rectangular Base Plate Modeling

39 Square /Rectangular Base Plate Modeling

40 Square /Rectangular Base Plate Modeling

41 Square /Rectangular Base Plate Modeling

42 Square /Rectangular Base Plate Modeling Total Joints =169 Total Elements =144 z X

43 Square /Rectangular Base Plate Modeling Master Joint ‘C1’ Slave Joints 57, 61 … 113 Spring Element ‘S1’ Spring Element ‘S169’

Edit Base Plate Input File 44 `` LOADING Output Non Linear Analysis

45 Square /Rectangular Base Plate Stresses B1B2 B3B4

46 Support Reactions for Bolts

Edit Rigid Base Plate Input File 47 `` Rigid Attachment Output Bolt : Pinned Support `` Stiffness Analysis Loading

48 Flexible & Rigid Base Plate Result Non-Linear Base Plate Analysis With Concrete & Bolt Stiffness Linear/Stiffness Base Plate Analysis Without Concrete & Bolt Stiffness Maximum Bolt Pull out Maximum Shear Load Base Plate Stresses Base Plate Displacement 339 lbs 423 lbs 949 lbs 9215 psi9404 psi Δy= ”Δy= ” FlexibleRigid

Questions? Thank you. 49