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Development of Software for Practical Nonlinear Inelastic Analysis S.E. Kim Department of Civil and Environmental Engine

Steel Lab., Sejong University, Seoul, Korea. Development of Software for Practical Nonlinear Inelastic Analysis S.E. Kim Department of Civil and Environmental Engineering Sejong University Seoul, Korea. 세종대학교 Steel Lab. Contents. Introduction Nonlinear Analysis

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Development of Software for Practical Nonlinear Inelastic Analysis S.E. Kim Department of Civil and Environmental Engine

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  1. Steel Lab., Sejong University, Seoul, Korea Development of Software for Practical Nonlinear Inelastic AnalysisS.E. KimDepartment of Civil and Environmental Engineering Sejong UniversitySeoul, Korea

  2. 세종대학교 Steel Lab Contents Introduction Nonlinear Analysis Nonlinear Inelastic Analysis Verification Modeling and Design Principles Design Example Conclusions

  3. Introduction Linear Elastic Analysis of System Member Capacity Check by Design Equation Developed on Nonlinear Inelastic Concept Steel Lab., Sejong University, Seoul, Korea Incompatibility of Conventional Design Procedure

  4. Introduction Steel Lab., Sejong University, Seoul, Korea Analysis Methods

  5. Introduction Steel Lab., Sejong University Design Methods

  6. Introduction Steel Lab., Sejong University Benefit of Nonlinear Inelastic Analysis • Accounts for geometric and material nonlinearities. • Not necessary for separate member capacity check. • Overcomes the difficulties due to incompatibility.

  7. Introduction Steel Lab., Sejong University Load-Displacement

  8. Introduction Steel Lab., Sejong University, Seoul, Korea NonlinearInelastic Analyses • FEM(ABAQUS, ANSIS, etc.) • Accurate but not practical • Plastic – Zone • Accurate but not practical • Second – Order Modified Plastic Hinge • Acceptably accurate and practical

  9. Nonlinear Analysis Steel Lab., Sejong University 2-D Beam-Column

  10. Nonlinear Analysis Stability Functions Steel Lab., Sejong University 2-D Force - Displacement

  11. Nonlinear Analysis positive in tension Steel Lab., Sejong University, Seoul, Korea Stability Functions

  12. Nonlinear Analysis Stability Function Steel Lab., Sejong University, Seoul, Korea 3-D Force - Displacement

  13. Nonlinear Inelastic Analysis Steel Lab., Sejong University, Seoul, Korea Inelastic Nonlinear Force - Displacement

  14. Nonlinear Inelastic Analysis for for Steel Lab., Sejong University, Seoul, Korea Inelasticity Associated with Residual Stresses

  15. Nonlinear Inelastic Analysis for for Steel Lab., Sejong University, Seoul, Korea Inelasticity Associated with Flexure

  16. Nonlinear Inelastic Analysis for for Steel Lab., Sejong University, Seoul, Korea Force-State Parameter()AISC-LRFD (Kanchanalai 1977)

  17. Nonlinear Inelastic Analysis Where, (strong-axis) (weak-axis) Steel Lab., Sejong University, Seoul, Korea Force-State Parameter()Orbison (1982)

  18. Nonlinear Inelastic Analysis Steel Lab., Sejong University, Seoul, Korea Modification of Element Stiffness for the Presence of Plastic Hinge at End A

  19. Verification Steel Lab., Sejong University, Seoul, Korea Column

  20. Verification Material property Yield Stress 36 ksi Young’s modulus 30,000 ksi Shear modulus 11,500 ksi Load Uniform floor pressure 100 psf Wind load 6 kips (in the Y-direction) Steel Lab., Sejong University, Seoul, Korea Orbison’s Six-Story Space Frame

  21. Verification Steel Lab., Sejong University, Seoul, Korea Load-Displacement

  22. Modeling and Design Principles 요소수 : 10 개 Steel Lab., Sejong University, Seoul, Korea Proposed Modeling

  23. Modeling and Design Principles 요소수 : 50,000 개 Steel Lab., Sejong University, Seoul, Korea ABAQUS Modeling

  24. Modeling and Design Principles Braced MemberUnbraced Frame Steel Lab., Sejong University, Seoul, Korea Geometric Imperfection

  25. Modeling and Design Principles Steel Lab., Sejong University, Seoul, Korea Design Format AISC-LRFD : member Proposed : system

  26. Design Example Material property Yield Stress 36 ksi Young’s modulus 30,000 ksi Shear modulus 11,500 ksi Load Uniform floor load 115 psf Wind load 7. 8 kips (in the Y-direction) Steel Lab., Sejong University, Seoul, Korea Twenty-Two Story Frame

  27. Design Example PlanElevation Steel Lab., Sejong University, Seoul, Korea Plan and Elevation of 22-Story Frame

  28. Design Example Columns (1-11 story) Columns (12-22 story) Beams Steel Lab., Sejong University, Seoul, Korea Member Sizes of 22-Story Frame

  29. Design Example Steel Lab., Sejong University, Seoul, Korea Load-Displacement

  30. Steel Lab., Sejong University, Seoul, Korea Conclusions A practical inelastic nonlinear analysis of three-dimensional steel frames has been developed Stability functions enable only one or two element per member to capture nonlinear effects The CRC tangent modulus and softening plastic hinge model predict inelastic behavior reasonably well The proposed analysis can be used in lieu of the costly FEM analysis The proposed design method overcomes the difficulties due to incompatible of ASD and LRFD

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