Preliminary User's Manual for SAPPAC: a Multisupport Modal Time Integrator and Transfer Function Plotter for SAP4 Models

摘要

This computer code is a linear dynamic response routine for SAP4 modal analysis. It is intended for three purposes, (a) to generate plots of the amplitude of the complex transfer function vs frequency for lightly damped structures allowing assessment of spectral sensitivity to modeling complexity, (b) a multi-support excitation capability based on the method of ''pseudostatic modes'', and (c) efficient modal time integration associated with large modal systems and many response quantities. This latter module (ZIP), is extractable for insertion into the probablistic response code SMACS. Also, this package is simple enough that others might easily extend it. Additional capability now available includes: a vector valued absolute datum acceleration plus relative acceleration multi-support input; rigid base rotation acceleration input (not yet exercised); composite modal damping by element group; inclusion of static response values supplied manually in input; vector magnitude moment response recovery for beams, pipes, and plates; on line spectral acceleration computation without storage of time histories; optional time history dumps for subsequent user supplied plotter; printout of amplitude normalized mode shapes of states too large for SAP4 to print. (ERA citation 11:049624)