This page was last updated on
December 12, 2013
EERA is a modern implementation of the
equivalent-linear concept of earthquake site response analysis, previously
implemented in the original and later versions of SHAKE.
requirements, downloading files and user's manual
and EXCEL 97 or later.
EERA does not work for other operating systems and spreadsheet programs.
All the files required for EERA can be downloaded from the table below:
file (metric units)
Example file (British units)
Dynamic Link Library
Additional Dynamic Link Library
earthquake input acceleration file
files above but zipped
Example for multiple analyses
manual and technical manual
user's manual and technical manual are also available online.
Note: Use the right mouse button to download
Install EERA on your computer as follows:
- If you have downladed EERA.zip instead of individual files, unzip
the contents of EERA.zip.
- Move file EERA.dll and Forrt.dll in the directory Windows/System of
your hard drive.
- Copy the other distribution files in a directory on your hard drive.
Do not move EERA.xla after having performed the next step.
- From within EXCEL, install the Add-in EERA.xla using Tools
and Add-ins... As shown in the figure below, use
Browse to locate EERA.xla. Do not move EERA.xla after installing
- When EERA is installed properly, the EERA menu appears to the right
of the EXCEL pull-down menus as shown in the figure below.
EERA can be de-installed by using
Remove EERA in the EERA pull-down menu.
Reporting problems and
EERA is a free software distributed without a technical support. Please
check the FAQ sectio. If you problem is not reported there, please report it
in detail by sending an email message to J. P. Bardet at firstname.lastname@example.org.
Problems with EERA will be fixed and new frequenly asked questions will be
Question: I encounter some error
messages about eera.dll after running EERA for the
Solution: Please check that the files eera.dll and dforrt.dll are in the