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GTSTRUDL Pushover Analysis How Do You Do It What Do You Get

Topics. Basic Nonlinear Analysis ProcedureMember Material NonlinearityNonlinear Member End ConnectionsPlastic HingeBasic Incremental Nonlinear Analysis ExampleBasic Pushover Analysis ProcedurePushover Analysis Features and MechanicsPushover Analysis ExamplesSteel Frame with Nonlinea

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GTSTRUDL Pushover Analysis How Do You Do It What Do You Get

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    1. GTSTRUDL Pushover Analysis How Do You Do It? What Do You Get? GTSTRUDL Users Group June 18-21, 2003 Clearwater Beach, FL

    2. Topics Basic Nonlinear Analysis Procedure Member Material Nonlinearity Nonlinear Member End Connections Plastic Hinge Basic Incremental Nonlinear Analysis Example Basic Pushover Analysis Procedure Pushover Analysis Features and Mechanics Pushover Analysis Examples Steel Frame with Nonlinear Member End Connections Steel Frame with Plastic Hinges RC Frame with Plastic Hinges by Force Control RC Frame with Plastic Hinges by Displacement Control

    3. Basic Nonlinear Analysis Procedure

    4. Nonlinear Effects Menu

    5. Nonlinear Effects Menu

    6. Nonlinear Spring Element Menus

    7. Nonlinear Spring Element Menus

    8. Nonlinear Spring Element Menus

    9. Nonlinear Spring Connections Properties

    10. Nonlinear Spring Connections Data Description

    11. Plastic Hinge Effects Basic Geometry

    12. Plastic Hinge Effects Basic Geometry

    13. Plastic Hinge Effects Properties The implication of this hinge configuration is that the three degrees of freedom are coupled, producing the classical axial force bending moment interaction which is not present in the NLS connection model.The implication of this hinge configuration is that the three degrees of freedom are coupled, producing the classical axial force bending moment interaction which is not present in the NLS connection model.

    14. Plastic Hinge Effects Properties

    15. Plastic Hinge Effects Properties

    16. Plastic Hinge Effects Properties -- Material Property Defaults

    17. Plastic Hinge Effects Properties Material Stress-Strain Examples

    18. Plastic Hinge Effects Properties Material Stress-Strain Examples

    19. Plastic Hinge Effects Properties RC Plastic Hinge Behavior

    20. Plastic Hinge Effects Summary of Characteristics Compact behavior; e.g. no local buckling, etc. Neutral axis shift automatically taken into account by equilibrium corrections. Failure is based on combined normal stress only (axial plus bending).

    21. Plastic Hinge Effects Summary of Characteristics Elastic loading/unloading behavior only. No hysteretic effects. May be mixed with any other member nonlinearity including NLS connections (DOFs may not overlap). All member modeling features supported: member loads, member releases, member eccentricities, etc.

    22. Plastic Hinge Effects Data Description Example WF Section

    23. Plastic Hinge Effects Data Description Example Rectangular RC Section

    24. Nonlinear Analysis Procedure

    25. Basic Nonlinear Analysis Example STRUDL 'NL1' 'BASIC NONLINEAR FRAME ANALYSIS' UNITS INCHES KIPS JOINT COORDS 1 0.0 180.0 S 2 120.0 180.0 3 120.0 135.0 4 120.0 90.0 5 120.0 45.0 6 120.0 0.0 S JOINT RELEASES 1 6 MOMENT Z TYPE PLANE FRAME MEMBER INC 1 1 2; 2 6 5 3 5 4; 4 4 3; 5 3 2

    26. Basic Nonlinear Analysis Example CONSTANTS E 10000.0 MEMBER PROPERTIES 1 AX 10000.0 IZ 100.0 2 TO 5 AX 10000.0 IZ 200.0 $ $ Perform nonlinear analysis in 4 $ load increments. $ UNITS KIPS FEET LOAD 1 MEMBER LOADS 1 FORCE Y GLO UNI FR W 25.0 NONLINEAR EFFECTS GEOMETRY MEMBERS 2 TO 5 MAXIMUM NUMBER OF CYCLES 50 CONVERGENCE TOLERANCE - DISPLACEMENT 0.001 NONLINEAR ANALYSIS CREATE LOAD COMBINATION Inc1 - SPECS 1 1.0

    27. Basic Nonlinear Analysis Example $ $ Load increment 2 $ Continue nonlinear analysis $ CHANGES LOAD 1 ADDITIONS MEMBER LOADS 1 FORCE Y GLO UNI W 25.0 PRINT APPLIED MEMBER LOADS LOAD LIST 1 NONLINEAR ANALYSIS CONTINUE CREATE LOAD COMBINATION Inc2 - SPECS 1 1.0 UNITS INCHES LIST DISPLACEMENTS FORCES UNITS FEET $ $ Load increment 3 $ Continue nonlinear analysis $ CHANGES LOAD 1 ADDITIONS MEMBER LOADS 1 FORCE Y GLO UNI W 25.0 PRINT APPLIED MEMBER LOADS

    28. Basic Nonlinear Analysis Example LOAD LIST 1 NONLINEAR ANALYSIS CONTINUE CREATE LOAD COMBINATION Inc3 - SPECS 1 1.0 UNITS INCHES LIST DISPLACEMENTS FORCES UNITS FEET $ $ Loading increment 4 $ Continue nonlinear analysis $ CHANGES LOAD 1 ADDITIONS MEMBER LOADS 1 FORCE Y GLO UNI FR W 25.0 PRINT APPLIED MEMBER LOADS LOAD LIST 1 NONLINEAR ANALYSIS CONTINUE CREATE LOAD COMBINATION Inc4 - SPECS 1 1.0 UNITS INCHES LIST DISPLACEMENTS FORCES FINISH

    29. Basic Pushover Analysis Procedure

    30. Basic Pushover Analysis Procedure

    31. Pushover Analysis Basic Features Nonlinear static analysis Automatic creation of load increments Automatic storage of load increment results Creation of intermediate load step conditions Intermediate load step conditions contain both results and applied loadings. Intermediate load steps stored in load group IncrLds

    32. Pushover Analysis Basic Features Automated search for collapse load factor All nonlinear effects supported

    33. Pushover Analysis Mechanics

    34. Pushover Analysis Mechanics

    35. Pushover Analysis Mechanics

    36. Pushover Analysis Mechanics

    37. Pushover Analysis Menu and Command Syntax

    38. Pushover Analysis Menu and Command Syntax

    39. Pushover Analysis Menu and Command Syntax

    40. Pushover Analysis Steel Frame Example with NLS Connections

    41. Pushover Analysis Steel Frame Example with NLS Connections

    42. Pushover Analysis Steel Frame Example with NLS Connections

    43. Pushover Analysis Steel Frame Example with NLS Connections

    44. Pushover Analysis Steel Frame Example with NLS Connections

    45. Pushover Analysis Steel Frame Example with NLS Connections

    46. Pushover Analysis Steel Frame Example with NLS Connections

    47. Pushover Analysis Steel Frame Example with NLS Connections

    48. Pushover Analysis Steel Frame Example with NLS Connections

    49. Pushover Analysis Steel Frame Example with Plastic Hinges

    50. Pushover Analysis Steel Frame Example with Plastic Hinges

    51. Pushover Analysis Steel Frame Example with Plastic Hinges

    52. Pushover Analysis Steel Frame Example with Plastic Hinges

    53. Pushover Analysis Steel Frame Example with Plastic Hinges

    54. Plastic Hinge Effects Steel Frame Example with Plastic Hinges

    55. Pushover Analysis Steel Frame Example with Plastic Hinges

    56. Pushover Analysis Steel Frame Example with Plastic Hinges

    57. Pushover Analysis Steel Frame Example with Plastic Hinges

    58. Pushover Analysis Steel Frame Example with Plastic Hinges

    59. Pushover Analysis Steel Frame Example with Plastic Hinges

    60. Pushover Analysis Steel Frame Example with Plastic Hinges

    61. Pushover Analysis Strategies Do a conventional nonlinear analysis first. Use FORM LOAD to create a version of your incremental load scaled to size of first increment. Use a larger collapse load convergence tolerance (~0.01) for the first pushover analysis attempt. Keep the loading rate on the smaller side. Its better to have two to four load increments that are basically linear.

    62. Pushover Analysis Strategies Larger convergence rate values -- 0.6 to 0.8 -- seem to perform better, i.e. result in a more economical number of load increments. ~50 appears to be the most economical maximum number of nonlinear analysis cycles, particularly with NLS elements, NLS connections, and plastic hinges.

    63. Pushover Analysis RC Frame Example with Plastic Hinges, Force Control

    64. Pushover Analysis RC Frame Example with Plastic Hinges, Force Control

    65. Pushover Analysis RC Frame Example with Plastic Hinges, Force Control

    66. Pushover Analysis RC Frame Example with Plastic Hinges, Force Control PUSHOVER ANALYSIS DATA CONSTANT LOAD 'DL' INCREMENTAL LOAD 'PUSH' MAXIMUM NUMBER OF LOAD INCREMENTS 40 MAXIMUM NUMBER OF TRIALS 11 LOADING RATE 1.0 CONVERGENCE RATE 0.6 CONVERGENCE TOLERANCE COLLAPSE 0.0005 CONVERGENCE TOLERANCE EQUIL 0.0001 MAXIMUM NUMBER OF CYCLES 100 END PERFORM PUSHOVER ANALYSIS

    67. Pushover Analysis RC Frame Example with Plastic Hinges, Force Control

    68. Pushover Analysis RC Frame Example with Plastic Hinges, Force Control

    69. Pushover Analysis RC Frame Example with Plastic Hinges, Displacement Control

    70. Pushover Analysis RC Frame Example with Plastic Hinges, Displacement Control

    71. Pushover Analysis RC Frame Example with Plastic Hinges, Displacement Control

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