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EZ-Frisk v7.52 Build 003 -Install + Medicine
What’s New in Version 7.52
This release adds an important new feature, calculation of the
Conditional Mean Spectrum. It also includes various enhancements and
minor bug fixes.
Conditional Mean Spectrum
The conditional mean spectrum is now calculated as a part of
deaggregation. The results can be view in the deaggreation report and as
a deaggregation plot. The details on how EZ-FRISK calculates the
conditional mean spectrum are found in the technical reference.
The conditional mean spectrum can be used as target spectrum for
spectral matching. The user interface now lets you select the target
spectrum as either a PSHA uniform hazard spectrum, a PSHA conditional
mean spectrum, or a user-defined target spectrum.
Deterministic Hazard Calculation for Subduction Interface Sources
Previously, the deterministic hazard calculation for this category of
sources presumed that the entire surface ruptured during the
deterministic event. Now, the code calculates the size of the rupture
for the deterministic magnitude, and then places the rupture at a
selection of locations on the surface of the source, based on the
integration parameters. It then selects the event with the greatest
This change should provide more realistic estimates for the focal depth,
rupture width, and center-of-energy distance to use in the
deterministic hazard calculation for these sources.
In seismic hazard analysis:
۱٫ Enabling or disabling deaggregation did not cause the seismic hazard
analysis definition document to be marked as modified. So if this was
the only change, it did not get saved. If this happened, the analysis
would not run with the deaggregation option the user desired. This
problem has been resolved.
۲٫ Not all calculational parameter entries were validated properly. If
an invalid calculational parameter was specified, the program would
allow the invalid document to be saved. However, calculational parameter
were validated upon reading. Consequently, if the invalid document
could not be reopened to fix the problem Now additional validation has
been added for subdution interface, subduction slab, and gridded
calculation parameters. In addition, these parameters are not validated
upon reading. Instead they are validated upon writing and use.
۳٫ The Atkinson-Boore ENA equations includes terms that are undefined
when the closest distance to rupture was zero. This caused the
attenuation equation to give undefined results for these cases, and very
large ground motions close to zero distance. This problem was resolved
by specifying a minimum distance of 1 km, instead of 0 km, for all
variants of this attenuation equation, since no data closer than 1 km
was used in developing these attenuation equations.
۴٫ In the McVerry attenuation equations for New Zealand, previously the
equation produced very large PGA ground motion predictions when used
with deep slab sources. This occurred because for short periods the
ground motion is predicted to increase with centroid depth . However,
McVerry’s equations are based on a data set with no events with a
centroid depth greater than 149 km. Consequently, we have added a cap to
the centroid depth used. The default value for this maximum centroid
depth is 149 km.
۵٫ In the McVerry attenuation equations based on Vs30, for some
circumstances, the wrong ground motion predictor equations were used
with some previous versions of EZ-FRISK. When this happened, the
standard McVerry code was used, hence the user would be required to
specify the New Zealand soil class directly, and the value of the Vs30
that the user specified would not be used to determine the New Zealand
soil class. This problem has been resolved.
۶٫ The McVerry attenuation equation variants for calculating the
strongest horizontal component of ground motion, the intensity type
previously was spectral acceleration at 5% damping. It has now been
changed to the maximum rotated component of spectral acceleration at 5%
damping. This should make it clearer which equation variants should be
used for typical analyses.
In spectral matching:
۷٫ The spectrum for external baseline corrected time history was not plotted correctly. This problem is now resolved.
۸٫ Changing the target spectrum source in spectral matching did not
cause the project document to be marked as modified. So if this was the
only change, it did not get saved.
۹٫ In calculating the target spectrum based on a PSHA uniform hazard
spectrum, the amplitude unit of measure previously was assumed to be
accelerations in G. Consequently, the target spectrum would not be
correct if the PSHA was for pseudo-spectral velocity or displacement, or
if the acceleration was in cm/sec/sec. Now, the target spectrum
generation includes a units conversion step.
۱۰٫ Previously, any seismic hazard analysis with output results in the
same project could be selected as the source of a uniform hazard
spectrum for use as the target spectrum for spectral matching. However,
some seismic hazard analyses cannot produce a useful uniform hazard
spectrum. For example, the seismic hazard analysis might have no PSHA
calculations, or it might be based on a non-spectral intensity type such
as peak ground velocity. Now, the program only allows selection from
analyses that are spectral and have two amplitudes.
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