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ABSTRACT
In industrial or production buildings, it is common practice to use handling equipments to move loads or to maintain the production tools. A distinction is made between overhead or underslung cranes that move on parallel runway beams and monorail hoist blocks that run on a single one. This article deals with the latter.
After specifying the purpose of the paper through some definitions and examples, a review of the crane induced actions is given. The paper then focuses on the design principles of monorail runway beams and some specific details. Finally, the design calculations of these beams are discussed, with particular attention paid to the evaluation of local stresses and their use in the associated design criteria.
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Read the articleAUTHOR
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Dominique SEMIN: Senior Steel Construction Engineer - Engineer Centrale Marseille (ex ESIM) - European Welding Engineer (EWE) - CHEC alumnus
INTRODUCTION
Specific rules for the justification of running girders are currently set out in standard NF EN 1993-6. The running girders covered by this text are those designed to support overhead travelling cranes, suspended cranes or simple carts.
Overhead travelling cranes are those which run on the upper flange of the running girders, transmitting the loads from the rollers, generally via rails. Suspended overhead travelling cranes run on the bottom flange of the running girders, with the rollers acting directly on them.
A cart is a cart, equipped with a hoist, suspended under a beam and running on the beam's lower flange. When the cart runs on a single fixed beam, it is referred to as a monorail cart beam, or, more synthetically, a monorail beam.
These monorail girders have a number of special features in comparison with overhead travelling cranes, linked on the one hand to the nature of the loads induced by the cart, and on the other to the determination and consideration of the local stresses induced in the bottom flange.
This article deals with monorail beams, and will successively summarize the actions due to cart cars, discuss the design principles and examine the justification methods for this type of beam.
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KEYWORDS
monorail beams | monorail hoist block | handling equipment
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Monorail beams – Terminology
Bibliography
Regulations
Order of March 1, 2004 on the inspection of lifting equipment and accessories
Standards and norms
- AFNOR Actions sur les structures. Partie 3 : Actions induites par les appareils de levage et les machines - NF EN 1991-3. AFNOR - 2007
- AFNOR Actions sur les structures. Part 3: Actions induced by lifting devices and machines. – National Annex to NF EN 1991-3:2007 - NF EN 1991-3/NA. AFNOR - 2010
- AFNOR Calcul des structures en acier. Partie 1-1 : Règles générales et règles pour le bâtiment - NF EN 1993-1-1....
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