In the context of the Research Fund for Coal and Steel: SEISRACKS2 project (RFSR-CT-2011-00031), CCS has developed a novel software for the design of pallet racks under seismic loads that takes into account the effects of second-order phenomena on the structure.
The software uses a new numerical analysis procedure, multi-modal spectral step-wise non-linear analysis, to combine the geometrical non-linear effects with the results of spectral analysis. The resulting procedure has the following advantages:
- It uses seismic data that is well defined in every national design code (parameterized spectra, importance categories, regional acceleration limits etc.)
- It uses fast, reliable and reasonably accurate algorithms and procedures (modified Newton-Raphson, CQC)
- It can be combined with existing software implementations
- It is easy to use and understand even for users without specialized knowledge (simple presentation of variables and data, user is not required to know the implementation details).
This software is intended as a research tool.
CCS is planning to create a commercial application based on the results of the SEISRACKS2 project, incorporating its many design recommendations.
For information on the SEISRACKS2 project, please see here.
The project focuses on the seismic design of static steel pallet racks, which are widely adopted in warehouses. Despite their lightness, racks can be loaded with tons of valuable goods, a live load by far higher than the self weight, opposite to what happens in usual civil engineering structures. The loss of these goods during an earthquake may represent, for the owner, a very large economic loss, much larger than the cost of the whole rack on which the goods are stored or of the cost for its seismic upgrade. Hence, solution of the problems connected with safe and reliable design of steel storage racks in seismic areas has a very large economic impact. The objective of the SEISRACKS2 project is to increase knowledge on actual structural behaviour and ductility of steel pallet racks, and to assess design rules for earthquake conditions by full-scale testing and numerical simulation.
Main outcomes of the research are:
- Detailed reports on the different aspects investigated;
- Validation or invalidation of the rules in the current version of FEM 10.2.08 ;
- Improvements and extension of the current rules in order to optimize the seismic behaviour of
structures designed according to European rules;
- Definition of standardized experimental procedures to qualify structural elements of rack
structures to be used in seismic areas.
- A new software tool for the design of rack structures under seismic loads