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Table of Contents Table of Contents IMDPlus User Manual 1 IMDPlus Assumptions ......................................................................................................... 1 Performing IMDPlus Calculations in LUSAS ...................................................................... 2 Seismic Analysis .................................................................................................................................... 2 Moving Load Analysis ........................................................................................................................... 2 Seismic Analysis .................................................................................................................. 2 Earthquake Input .................................................................................................................................... 3 Mode and Damping Control ................................................................................................................... 4 Frequency Interpolation .......................................................................................................................... 5 Moving Load Analysis ......................................................................................................... 6 Setup Moving Load Path ........................................................................................................................ 6 Setup Modal History Information ......................................................................................................... 11 Running the Moving Load Analysis ..................................................................................................... 11 Visualising the Results ...................................................................................................... 14 Node / Element Selection ..................................................................................................................... 15 Output Control ..................................................................................................................................... 18 Elements Supported By IMDPlus ...................................................................................... 23 Worked Example: Seismic Analysis of a 2D Frame (Time Domain) 25 Description ......................................................................................................................... 25 Discussion ............................................................................................................................................ 26 Modelling ............................................................................................................................ 27 Running LUSAS Modeller ................................................................................................................... 27 Building and loading the model ........................................................................................................... 27 Defining Eigenvalue Controls .............................................................................................................. 28 Running the Analysis ......................................................................................................... 29 Viewing the Results ........................................................................................................... 29 Plotting Mode Shapes .......................................................................................................................... 29 Printing Eigenvalue Results ................................................................................................................. 30 Checking the Mass Participation Factor ............................................................................................... 31 Seismic Response Analysis .................................................................................................................. 32 Defining the Seismic Parameters .......................................................................................................... 33 Displacement Plots ............................................................................................................................... 35 Velocity Plots ....................................................................................................................................... 39 Acceleration and Secondary Response Spectra Plots ........................................................................... 41 Displaying Individual Element Results ................................................................................................ 43 Displaying Results for a Selected Set of Elements ............................................................................... 46 Save the model ..................................................................................................................................... 51 Worked Example: Seismic Analysis of a 3D Frame (Time Domain) 53 Description ......................................................................................................................... 53 Discussion ............................................................................................................................................ 54 Modelling ............................................................................................................................ 55 Running LUSAS Modeller ................................................................................................................... 55 Building and loading the model ........................................................................................................... 55 Defining Eigenvalue controls ............................................................................................................... 56 Running the Analysis ......................................................................................................... 57 Viewing the Results ........................................................................................................... 58 Seismic Response Analysis .................................................................................................................. 58 Defining the Seismic Parameters .......................................................................................................... 59 Individual Node Displacements ........................................................................................................... 61 Average and Peak Displacements for a Selection of Nodes ................................................................. 64 Peak Axial Forces from All of the Elements in the Model ................................................................... 69 i
