Seismic Behaviour of Steel Storage Pallet Racking Systems - Part 1

12/05/2015 5768

Il progetto EU-RFCS "SEISRACKS2":"Seismic Behaviour of Steel Storage Pallet Racking Systems"

PARTE 1: GENERALITA

Carlo A. Castiglioni, Alper Kanyilmaz , Alberto Drei, Politecnico di Milano, Department of Architecture, Building and Construction, Milano, Italy
Hervè Degee, Catherine Braham, University of Liege, Department Argenco, Liege, Belgium
Benno Hoffmeister, Cristoph Heinemeyer, RWTII Aachen, Department of Steel Construction, Aachen, Germany
Ioannis Vayas, Kostantinos Adamakos, NTU Athens, Department of Steel Construction, Athens, Greece
Stefano Sesana, Barbara Orsatti, SCL Ingegneria Strutturale, Milano, Italy

Questa Memoria è tratta dagli Atti del XXIV CONGRESSO CTA, Torino 30 settembre - 2 ottobre 2013 

Questo lavoro intende illustrare il progetto Europeo SEISRACKS2 : "Seismic Behaviour of Steel Storage Pallet Racking Systems", RFSR-CT-2011-00031. Dopo un inquadramento generale della ricerca, si presentano le attività svolte nei primi 18 mesi.
La presentazione è organizzata in tre parti: la prima fornisce un inquadramento generale del progetto ed un'identificazione delle lacune della attuale versione della norma FEM 10.2.08, nonché un inquadramento dei casi studio. La seconda parte riassume i risultati sperimentali sin qui ottenuti (WP 2, 3 e 4), e la terza descrive le attività numeriche (WP 5 e 7).

INTRODUCTION
CEN TC344 is currently developing a preliminary normative document based on European Racking Federation (ERF) FEM 10.2.08 v 1.04: 2011 and on recent research works. The current version of FEM 10.2.08 (v.1.04: 2011) is fundamentally based on the experimental results obtained within the frame of the EU-RFCS project SEISRACKS 1. However this document is still far from becoming a Euronorm (EN) due to remaining lacks of knowledge leading to conservative design rules and consequently to strong technical limitations when designing static steel pallet racks with respect to seismic safety.
The objective of the SEISRACKS2 project is to solve these limitations by increasing knowledge on actual structural behaviour and ductility and to assess design rules for earthquake conditions. The main expected outcomes of the research are:
1. Detailed reports on the different aspects investigated;
2. Validation or invalidation of the rules in the current draft of FEM 10.2.08, v 1.04: 2011;
3. Improvements and extension of the current rules in order to optimize the seismic behavior of structures designed according to European rules;
4. Definition of standardized experimental procedures to qualify structural elements of rack structures to be used in seismic areas.
5. Development of a software tool for the design of rack structures under seismic loads.

Partners of the project are: Politecnico di Milano, Architecture, Building and Construction Department (Coordinator) (I), University of Liege, Depatment ArGenCo (B), RWTH Aachen, lnstitute of Steel Construction (D), National Technical University of Athens, Department of Steel Construction (GR), SCL Ingegneria Strutturale (I), MODULBLOK S.p.A. (I), NEDCON Magazijninrichting B.V. (NL), FRITZ SCHAFER GmbH (D), STOW INTERNATIONAL N.V (B) and CCS COMPUTER CONTROL SYSTEMS S.A. (GR).
The project is organized in 8 work.packages, whose objectives are respectively the following:
WP 1 DEFINITION OF CASE STUDIES
• Clear identification of the lacks and weaknesses in the latest version of the FEM Recommendations for the design of static steel pallet racks under seismic conditions prFEM 10.2.08; comparison with R.M.I. recommendations when relevant.
• Designing a set of structures following the above recommendations (2 configurations for each industrial partner -> 8 configurations in total: 4 for moderate seismicity and 4 for high seismicity). Different total height of the structure will also be considered. The design will be performed by the industrial partners according to their day-to-day practice.

WP2 COMPONENT TESTING
• Assessment of component (beam-to-upright, upright-to-base, upright-to-bracing connections) behaviour
• Assessment of local ductility of cross frames
• Verification of applicability of monotonic test results obtained in frame of approvals to the assessment of cyclic performance
• Application of the components method for characterizing rack connections.

WP3 WAREHOUSE TESTING
• Operational monitoring of a real warehouse
• Identification of the dynamic properties of racks and of pallets/merchandize

WP4 FULL SCALE TESTING
• Assessment of the global behaviour of full scale racks in down aisle and in cross-aisle direction

WP5 NUMERICAL STUDIES
• Calibration of numerical models
• Evaluation of q-factors for different structural typologies
• Parametric studies ( assessment of influence of occupancy rate and merchandize properties)

WP6 ASSESSMENT OF SEISMIC DESIGN METHODOLOGY
• Assessment of seismic design rules
• Update and improvement of prFEM 10.2.08
• Proposal for Standard testing procedures for qualification of joints and of substructure in cross-aisle direction
• Drafting a "Designer' s Manual" for seismic design of racks according to FEM and to the new rules eventually derived within this research

WP7 SOFTWARE TOOL DEVELOPMENT
• Software implementation for a geometrical non linear multimodal dynamic analysis of pallet racks under seismic loading.

WP 8 COORDINATION
This paper is the first one of a set of three, aimed at the presentation of the results achieved in the first 18 months (mid-term) of the research, and deals with the first Work Package.
Another paper, presented at the same conference deals with the experimental activities achieved to date within W ork Packages 2 to 4, while a third papers will cover the numerical activities dealt with in Work Packages 5 and 7. Activities of Work Package 6 has not started yet, and are scheduled for the last semester of the project.

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