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Contents
ABOUT THE USER’S MANUAL.......................................................................................................1
WELCOME TO NONLIN ........................................................................................................................2
WHAT IS NONLIN? .......................................................................................................................................................2
PROGRAM DESIGN AND CONCEPTS.................................................................................................................................2
SYSTEM REQUIREMENTS ................................................................................................................................................3
INSTALLING NONLIN USING THE SETUP UTILITY .......................................................................................................3
PART ONE: NONLIN SDOF Systems - Program Data Input
DESCRIPTION OF THE USER INTERFACE ....................................................................................................6
THE MENU ITEMS ......................................................................................................................................................7
THE BUTTON BAR ...................................................................................................................................................13
Structure Restore Button ....................................................................................................................................13
NO GO/GO Analysis Buttons............................................................................................................................13
View Computed Time Histories Button.............................................................................................................13
View Computed Hysteresis Plots Button ...........................................................................................................14
View Computed Energy Plots Button ................................................................................................................14
Review Summary of Computed Results Button.................................................................................................14
Animate Button ..................................................................................................................................................14
Response Spectrum Plot Button.........................................................................................................................15
Displacement Ductility Spectra Plot Button ......................................................................................................15
ENTERING STRUCTURAL PROPERTIES......................................................................................................16
THE UNIT TYPE, LENGTH UNITS AND FORCE UNITS FRAMES .................................................................................16
THE CONSTITUTIVE PROPERTIES FRAME .................................................................................................................16
Structural Mass/Weight/Period Button ..............................................................................................................17
Structural Damping Button ................................................................................................................................17
Structural Stiffness K0 Button ............................................................................................................................18
Structural Strain Hardening Stiffness K2 Button................................................................................................19
P-Delta Stiffness KG Button..............................................................................................................................19
Yield Strength Fy Button....................................................................................................................................21
Linear/Nonlinear Analysis Options....................................................................................................................21
DYNAMIC PROPERTIES OUTPUT FRAME ..................................................................................................................22
SUMMARY OF LATEST RUN OUTPUT FRAME ...........................................................................................................22
DYNAMIC FORCE APPLIED AS... INPUT FRAME ........................................................................................................23
Defining a Ground Acceleration ........................................................................................................................23
Displaying Ground Acceleration Plots...............................................................................................................26
Generating and Displaying Response Spectrum Plots .......................................................................................27
Generating and Displaying Demand Spectrum Plots .........................................................................................29
Code Spectra Plots .............................................................................................................................................30
Generating and Displaying Fourier Amplitude Spectrum Plots.........................................................................31
Defining a Wave Forcing Function....................................................................................................................34
Displaying Wave Generator Plots ......................................................................................................................36
Free Vibration ....................................................................................................................................................36
PART TWO: NONLIN SDOF Systems - Program Results Output
PROGRAM EXECUTION RESULTS ................................................................................................................39
RUNNING THE ANALYSIS .........................................................................................................................................39