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Deteriorating Hysteresis Model for Cold-Formed Steel Shear Wall Panel Based on Physical and Mechanical Characteristics 
Op...
Outline of Presentation Introduction to Cold-Formed Steel Framing system Hysteresis model development Model validation Sum...
3/22 
Advantages : Lightness, Recycling, Easy Erection, etc. 
Shear Wall Panel (SWP) 
Cold Formed Steel framing (CFS) syst...
Other components: 
Hold-down 
Anchor rods (7/8”) 
Shear bolts (3/4”) 
Intermediate stud 
Steel sheathing 
Bottom track ...
5/22 
PGA: 0.25 
Max. displacement: 24.0 mm 
OpenSeesDays Portugal 2014 – OPD 2014 
Cold Formed Steel framing (CFS) system...
Objectives 
6/22 
 Development of a smooth hysteresis model for CFS SWP with parameters expressed explicitly in terms of ...
Hysteresis model CFSSWP 
7/22 
CFSSWP deteriorating model can be used to simulate the CFS SWP lateral response when subjec...
Hysteresis model CFSSWP 
8/22 
Analytical methods for assessing the maximum lateral shear strength capacity of CFS SWP 
 ...
9/22 
Comparison between monotonic test measurements and numerical model results 
OpenSeesDays Portugal 2014 – OPD 2014 
B...
Hysteresis model CFSSWP 
10/22 
• Hysteresis criteria 
OpenSeesDays Portugal 2014 – OPD 2014 
Monotone cubic spline Algori...
Hysteresis model CFSSWP 
11/22 
Comparison between monotonic and cyclic lateral response of CFS SWP 
OpenSeesDays Portugal...
Hysteresis model CFSSWP 
12/22 
Sc : Screw spacing (mm) ; 
H et W : Height and Width of the CFSS SWP (mm), respectively. 
...
Hysteresis model CFSSWP 
13/22 
• Deterioration criteria 
OpenSeesDays Portugal 2014 – OPD 2014
C++ script of CFSSWP Hysteresis Model (CFSSWP.h) 
14/22 
OpenSeesDays Portugal 2014 – OPD 2014
C++ script of CFSSWP Hysteresis Model (CFSSWP.cpp) 
15/22 
OpenSeesDays Portugal 2014 – OPD 2014
Hysteresis model validation 
16/22 
OpenSeesDays Portugal 2014 – OPD 2014 
• Modelling of the CFS SWP
17/22 
OpenSeesDays Portugal 2014 – OPD 2014 
Hysteresis model validation 
• Loading protocol
Numerical results 
18/22 
Comparison between test measurements and numerical model results of wood sheathed SWP 
Specimen ...
Numerical results 
19/22 
Comparison between test measurements and numerical model results of steel sheathed SWP 
Specimen...
Conclusion 
20/22 
 Hysteresis model has been developed where its parameters are related to the physical and mechanical c...
Acknowledgment 
21/22 
Mr. Omar Bourahla (USTHB University, Algeria) Dr. Iman Shamim (McGill University, Canada) Mr. Ribei...
22/22 
Thank you for your attention 
OpenSeesDays Portugal 2014 – OPD 2014 
Questions !
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Deteriorating Hysteresis Model for Cold-formed Steel Shear Wall Panel based on Physical and Mechanical Characteristics

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Presentation made by Smail Kechidi @ University of Porto during the OpenSees Days Portugal 2014 workshop

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Deteriorating Hysteresis Model for Cold-formed Steel Shear Wall Panel based on Physical and Mechanical Characteristics

  1. 1. Deteriorating Hysteresis Model for Cold-Formed Steel Shear Wall Panel Based on Physical and Mechanical Characteristics OpenSeesDays Portugal 2014 – 4 July 2014 Smail Kechidi*, Nourdine Bourahla University of Blida 1, Algeria. *email: kechidi@hotmail.fr 1/22
  2. 2. Outline of Presentation Introduction to Cold-Formed Steel Framing system Hysteresis model development Model validation Summary & Conclusions 2/22 OpenSeesDays Portugal 2014 – OPD 2014
  3. 3. 3/22 Advantages : Lightness, Recycling, Easy Erection, etc. Shear Wall Panel (SWP) Cold Formed Steel framing (CFS) system OpenSeesDays Portugal 2014 – OPD 2014
  4. 4. Other components: Hold-down Anchor rods (7/8”) Shear bolts (3/4”) Intermediate stud Steel sheathing Bottom track Chord stud Blocking 4/22 OpenSeesDays Portugal 2014 – OPD 2014 Cold Formed Steel framing (CFS) system • Steel sheathing/CFS frame shear wall panel
  5. 5. 5/22 PGA: 0.25 Max. displacement: 24.0 mm OpenSeesDays Portugal 2014 – OPD 2014 Cold Formed Steel framing (CFS) system • CFS shear wall panel behaviour
  6. 6. Objectives 6/22  Development of a smooth hysteresis model for CFS SWP with parameters expressed explicitly in terms of SWP physical and mechanical characteristics  Hysteresis model implementation into OpenSees using a DLL named CFSSWP  Model validation through experimental test results OpenSeesDays Portugal 2014 – OPD 2014
  7. 7. Hysteresis model CFSSWP 7/22 CFSSWP deteriorating model can be used to simulate the CFS SWP lateral response when subjected to quasi-static or dynamic loading. OpenSeesDays Portugal 2014 – OPD 2014
  8. 8. Hysteresis model CFSSWP 8/22 Analytical methods for assessing the maximum lateral shear strength capacity of CFS SWP  Martinez (2007) for Wood sheathed CFS SWP  Yanari N. and Yu C. (2013) for Steel sheathed CFS SWP • Backbone curve OpenSeesDays Portugal 2014 – OPD 2014
  9. 9. 9/22 Comparison between monotonic test measurements and numerical model results OpenSeesDays Portugal 2014 – OPD 2014 B-Spline Algorithm Hysteresis model CFSSWP Wood sheathed SWP Steel sheathed SWP
  10. 10. Hysteresis model CFSSWP 10/22 • Hysteresis criteria OpenSeesDays Portugal 2014 – OPD 2014 Monotone cubic spline Algorithm
  11. 11. Hysteresis model CFSSWP 11/22 Comparison between monotonic and cyclic lateral response of CFS SWP OpenSeesDays Portugal 2014 – OPD 2014 Wood sheathed SWP Steel sheathed SWP
  12. 12. Hysteresis model CFSSWP 12/22 Sc : Screw spacing (mm) ; H et W : Height and Width of the CFSS SWP (mm), respectively. OpenSeesDays Portugal 2014 – OPD 2014 • Deterioration criteria
  13. 13. Hysteresis model CFSSWP 13/22 • Deterioration criteria OpenSeesDays Portugal 2014 – OPD 2014
  14. 14. C++ script of CFSSWP Hysteresis Model (CFSSWP.h) 14/22 OpenSeesDays Portugal 2014 – OPD 2014
  15. 15. C++ script of CFSSWP Hysteresis Model (CFSSWP.cpp) 15/22 OpenSeesDays Portugal 2014 – OPD 2014
  16. 16. Hysteresis model validation 16/22 OpenSeesDays Portugal 2014 – OPD 2014 • Modelling of the CFS SWP
  17. 17. 17/22 OpenSeesDays Portugal 2014 – OPD 2014 Hysteresis model validation • Loading protocol
  18. 18. Numerical results 18/22 Comparison between test measurements and numerical model results of wood sheathed SWP Specimen H/W ratio (mm) Wood type Sheathing thickness (mm) Screw spacing (mm) Screw number 32 2440/2440 CSP 12.5 102 98 OpenSeesDays Portugal 2014 – OPD 2014
  19. 19. Numerical results 19/22 Comparison between test measurements and numerical model results of steel sheathed SWP Specimen H/W (mm) ts (mm) Fus (MPa) Fys (MPa) tf (mm) Fus (MPa) Fys (MPa) Sc (mm) Vs (N) 3C-a 2440/1220 0.46 391 342 0.87 395 300 150 1560 OpenSeesDays Portugal 2014 – OPD 2014
  20. 20. Conclusion 20/22  Hysteresis model has been developed where its parameters are related to the physical and mechanical characteristics of CFS SWP.  The model has been integrated into finite element software OpenSees as a user-defined uniaxial material using a DLL written in C++ programming language named CFSSWP.  The efficiency of the modeling tip and the accuracy of the proposed model have been proved by an acceptable correlation rate between the experimental and the analytical results in terms of shear strength-lateral displacement relationship, as well as the cumulative energy dissipation. • Conclusions OpenSeesDays Portugal 2014 – OPD 2014
  21. 21. Acknowledgment 21/22 Mr. Omar Bourahla (USTHB University, Algeria) Dr. Iman Shamim (McGill University, Canada) Mr. Ribeiro Filipe (Nova University of Lisbon, Portugal) OpenSeesDays Portugal 2014 – OPD 2014
  22. 22. 22/22 Thank you for your attention OpenSeesDays Portugal 2014 – OPD 2014 Questions !

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