Process of Seismic Simulation Process of Seismic Simulation of a - - PowerPoint PPT Presentation

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Process of Seismic Simulation Process of Seismic Simulation of a - - PowerPoint PPT Presentation

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Process of Seismic Simulation Process of Seismic Simulation of a 2-Bay, 2-Story RC Building Michelle Stadel NSF Summer Scholar University of Houston OVERVIEW OVERVIEW National Center for Research on Earthquake q Engineering project

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SLIDE 1

Process of Seismic Simulation Process of Seismic Simulation

  • f a 2-Bay, 2-Story RC Building

Michelle Stadel

NSF Summer Scholar University of Houston

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SLIDE 2

OVERVIEW OVERVIEW

  • National Center for Research on Earthquake

q Engineering project

  • Open System for Earthquake

Engineering Simulation

  • Basics of Tcl/Tk script
  • 2D Frame example simulation
  • NCREE structure simulation

R l

  • Results
  • Additional research
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SLIDE 3

NCREE Project j

St d ff t f t i d lti

  • Study effects of torsion and multi-

directional loading on RC structure

  • Study real-time data and incorporate

computer simulations for applications beyond the project

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SLIDE 4

N C R E E P R O J E C T

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SLIDE 5

OpenSees OpenSees

Open System for Earthquake Engineering Simulation

  • Developed by Pacific Earthquake Engineering Research Center

& the University of California, Berkeley

  • Object-oriented framework for finite element analysis
  • Uses Tcl/Tk script
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SLIDE 6

Basics of Tcl/Tk Script

Basic syntax -- Command argument1 argument2 Example: expr 20 + 10 The set command writes and reads variables. $ ll i l d fi d i bl $ recalls previously defined variables.

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SLIDE 7

M d l f O S Modules for OpenSees

MODEL RECORDER ANALYSIS

Defines: Creates an output Defines objects Defines:

  • Coordinate system
  • Beams

Creates an output file that records data of interest to the programmer. e es objec s necessary for performing the analysis

  • Columns
  • Materials
  • Cross-sections
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SLIDE 8

2-D frame problem 2 D frame problem

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SLIDE 9

Modeling Modeling

  • Model

Model

  • Node

C t i t

Column cross section

  • Constraints
  • Materials

Column cross-section

  • Section
  • Element

Element

  • Load

Beam cross-section

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SLIDE 10

Recorder Recorder

# Define LATERAL LOADS --------------------------- # Define LATERAL LOADS pattern Plain 1 Linear { # nodeID Fx Fy Mz # nodeID Fx Fy Mz load 15 100.0 0.0 0.0 } # Create RECORDERS -------------------------------- recorder Node file Node15 out time node 15 recorder Node -file Node15.out -time -node 15

  • dof 1 disp
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SLIDE 11

Analysis Analysis

system BandGeneral constraints Transformation numberer RCM test NormDispIncr 1.0e-12 50 0 algorithm Newton integrator DisplacementControl 15 1 0.1 analysis Static initialize analyze 50

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SLIDE 12

2-D frame results

Ulti t St th

2 D frame results

70

Ultimate Strength 64 kips

50 60 30 40 Load (kips)

Ruptures at 63 kips

10 20 L

Modulus of Elasticity

2 4 6 8 10 12 Displacement (inches)

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SLIDE 13

2-story 2-bay RC building 2 story, 2 bay RC building

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Column cross-section

2-story, 2-bay 2 story, 2 bay RC building

Beam cross-section Model differences:

  • Numbering of nodes

C ti Beam cross section

  • Cross-sections
  • Section aggregators
  • Loading
  • Shear walls
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SLIDE 15

Shear Walls Shear Walls

  • Reinforced concrete plane
  • Reinforced concrete plane

stress elements

  • Modeled by standard brick
  • Modeled by standard brick

element M t i l l ti i t i

  • Material – elastic isotropic
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SLIDE 16

600 700

Results Results

400 500 600

ad (kN)

Results Results

100 200 300

Loa

1 2 3 4 5

Displacement (mm)

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SLIDE 17

On-going Research g g

  • Work is continuing to fine tune to the

OpenSees program to simulate the structure’s response to earthquake loading.

  • The structure is set to be tested next week

in Taiwan.

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SLIDE 18

References

  • Howser, Rachel, A. Laskar, Y.L. Mo. (2007) “Seismic Interaction of Flexural

Ductility and Shear Capacity in Reinforced Concrete Columns.”

  • Hwang, S.J., M. Saiid Saiidi, Sara Wadia-Fascetti, JoAnn Browning, Jerry P. Lynch,

Kamal Tawfig, K.C. Tsai, G. Song, Y.L. Mo. (2006) “Experiments and Simulation of Reinforced Concrete Buildings Subjected to Reversed Cyclic Loading and Shake Table Excitation.”

  • Mazzoni Silvia Frank McKenna Michael H Scott Gregory L Fenves et al
  • Mazzoni, Silvia, Frank McKenna, Michael H. Scott, Gregory L. Fenves, et. al.

(2006). “Open System for Earthquake Engineering Simulation User Command- Language Manual,” Pacific Earthquake Engineering Research Center, UC Berkeley, http://opensees.berkeley.edu/OpenSees/manuals/usermanual/index.html.

  • Pacific Earthquake Engineering Research Center (PEER). (2001) “Open System for

Earthquake Engineering Simulation.” http://peer.berkeley.edu/news/2001spring/opensees.html S h d D i l (2006) “S i i h S i A hi ”

  • Schwerd, Daniel. (2006) “Scriptics.com – the Script Archive.”

http://dev.scriptics.com/software/tcltk/.

  • Tseng, Chien-Chuang. (2006) Experiment of Reinforced Concrete Building Frame

Presentation Presentation.

  • http://bi-directional.blogspot.com/
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SLIDE 19

Acknowledgement The research study described herein was The research study described herein was sponsored by the National Science Foundation under the Award No EEC- Foundation under the Award No. EEC

  • 0649163. The opinions expressed in this

study are those of the authors and do not study are those of the authors and do not necessarily reflect the views of the sponsor sponsor.