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March 10, 2016

Time History PEER2

The Pacific Earthquake Engineering Research center (PEER) has a large library of measured earthquake records.   Below is an example of how to quickly convert one of these records into a format that can be imported into RISA. PEER Earthquake Record The main header indicates the information is for the Northridge earthquake measured in a particular […]

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February 24, 2016

Ramp1

When creating a Time History function for sinusoidal equipment loading the program can automatically adjust the force and frequency at the beginning and end of the time history function. Ramp Up Function RISA allows you to define “Ramp Up Functions” to control how the force and frequency vary during this initial startup time.  Typically cyclic […]

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January 14, 2016

Trace

New in RISA-3D V14 is the introduction of a Time History analysis feature. Time history functions may be generated directly in the program based on simple sinusoidal functions.  More complex functions, however, can be imported from a text file. Import Format RISA can import a Time History function from an ASCII text file. The RISA Help file […]

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November 24, 2015

TH Video2

Time history analysis solves for normal analysis results (joint displacements, member forces, code checks, et cetera) based on loading that varies with time. For some analyses it may be useful to view an animation of the deflected shape of the structure as a function of time.  This blog topic serves as a guide for users […]

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August 20, 2015

Residual_Mode_shape

When running a Response Spectrum analysis for seismic design, the response for high frequency modes can be included without solving for their individual mode shapes.  This is often done to save analysis time and memory. This topic discusses some of the technical background and gives references for RISA’s implementation of this method. Simple Overview It […]

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