Introduction to Rocking Structures

The software presented here is illustrative software to
implement the ideas that emerged from a research project into
rocking wall design. It is
designed to provide a rocking wall designer with information to
determine the appropriate design parameters for a rocking wall
installation. For background information about the principles
behind the software, and about the software itself, please read
the paper, *Quasi-static Analysis of Rocking
Wall Systems*.

Paper appendices: A: D*ata for
Benchmark Buildings*, B: A*n
Example MATLAB Code to Determine the Stiffness Matrix of a
Discretized Building-Rocking Wall System**, **C:
Generation of Benchmark Buildings*

Given some basic data about a structure and its location, the software will:

- Determine the equivalent seismic loads for the structure,
based on the ASCE 7-05 code, more accurately than other
"base shear calculators" available on the
Internet.

- Infer the stiffness matrix for the structure, based on
the mass and code-determined period, if required.

- Determine the stiffness matrix of the modified structure
with the rocking wall attached.

- Determine the new seismic loads including the additional
inertia of the rocking wall.

- Determine the maximum storey drifts of the structure
under the equivalent seismic loading, and at which floor
this occurs.

- Look at a wide range of different possible rocking wall
sizes, and determine the rocking wall size which provides
the minimum maximum storey drift.

- Provide data of rocking wall size against maximum storey
drift, showing the minimum found, which may be plotted in
any spreadsheet application.

The software provides information about a structure which is useful for structural engineers even if they are not designing a rocking wall installation.

Want to **test it out?** There is a
button to **generate example values** at the bottom of the
applet.

NB: The flexibility matrix generated by this software is in the top-node-1 format, so the 1st element of your load and displacement vectors represents the load and displacement at the top floor. This is unlike the paper, which uses the top-node-N convention.

Some links: Natsci, Prime Number Fun, Google Tricks, Civil Engineering Consultancies, Structural Engineering Consultancies, Patent Search, Rocking Wall Design

*© 2012, ds1 at mit dot edu.* Terms of use / standard disclaimer