Invoking racron

The format for running the racron program is:

racron [datafile] option ...

racron supports the following options:

`--help'

Print an informative help message describing the options and then exit.

`--version'

Print the version number of hello and then exit.

`--earthquake'

Specify that the excitation is a ground acceleration (default mode).

`--force'

Specify that the excitation is an external force.

`--max-response'

Print only the maximum values of the response.

`--time-histories'

Print the complete time histories of the response (default mode).

`-l'

`--linear'

Specify that the SDOF system is linear. This is the default mode, so you don't have to use this option. Its stiffness is calculated from the given values for mass and natural period of vibration.

`-b fy [ky]'

`--bilinear=fy [ky]'

Specify that the SDOF system is bilinear. The first argument specifies the yield strength and is required. The second argument specifies the yield stiffness and is optional. If you don't supply a second argument, the system is taken to be elastoplastic.

`--linear-interpolation'

Use the linear interpolation method. This method is only applicable to linear systems.

`--central-difference'

Use the central difference method.

`--newmark-average'

Use the non-iterative average acceleration Newmark method. This is the default method.

`--newmark-linear'

Use the non-iterative linear acceleration Newmark method.

`--newmark-average-iterative'

Use the iterative average acceleration Newmark method.

`--newmark-linear-iterative'

Use the iterative linear acceleration Newmark method.

`-i dt'

`--interval=dt'

Specify the time interval between excitation values.

`-m mass'

`--mass=mass'

Specify the mass of the SDOF system.

`-z ratio'

`--zeta=ratio'

Specify the damping ratio of the SDOF system.

`-p period'

`--period=period'

Specify the natural period of vibration of the SDOF system.

`-n number'

`--number=number'

Number of SDOF systems to solve. This option is usually used together with --max-response and is useful for producing response spectra. It generates systems whose natural periods are logarithmically tabulated between 0.01 and 10 seconds.

`-A string'

`--acceleration-units=string'

Specify units of input acceleration values. Example strings are 'cm^2/s', 'in^2/s' and 'gravity'. For more details on the syntax of units declarations see the GNU units info page. Acceleration is printed in 'gravity' units by default.

`-V string'

`--velocity-units=string'

Specify units of output velocity values. Example strings are 'm/s' and 'in/s'. The default value is 'cm/s'.

`-D string'

`--displacement-units=string'

Specify units of output displacement values. Example strings are 'cm' and 'in'. The default value is 'cm'.

`-F string'

`--force-units=string'

Specify units of input force values. Example strings are 'KN' and 'kips'. Note that if you use this option, it must come in the command line before the -b option. The default value is 'N'.

`-M string'

`--mass-units=string'

Specify units of given mass value. Example strings are 'kg' and 'kip*s^2/in'. Note that if you use this option, it must come in the command line before the -m option. The default value is 'kg'.

`--no-headers'

Do not print any headers in output. This is useful if you want to pipe the output of racron through another program, or paste it directly in a spreadsheet.

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