Pot bearings trelleborg infrastructure pdf catalogs. Elastomeric bearings can absorb horizontal movements in every direction and rotational movements around every axis through elastic layers deformation. Idots extreme thermal design range has been reduced to more accurately reflect illinois conditions and to align with the thermal ranges given in articles 3. The surface of contact between concrete and bearing shall be smooth, free from protruding parts and clean, to afford perfect seating of bearing. If curved bearing is cylindrical, then it only accommodates rotation movements. M25106ul plain and laminated elastomeric bridge bearings. Natural rubber bearings possess distinct advantages over alternative metal roller types, being easier to install, free from corrosion and requiring no maintenance, factors important in the economics of bridge building. Although many different types of bridge bearings have been used by the nysdot, elastomeric and multirotational bearings are the. The bearing accommodates for displacements in both plane directions, rotations enabled, and does not transmit any horizontal. Installation elastomeric bearings pads based on aashto. Maurer structural bearings state of the art of sustainable solutions. Plain and reinforced elastomeric bearings have become the most common type of bearing in recent years because of their desirable performance characteristics, durability, low maintenance requirements, and relative economy. All this is encompassed in a unit having the lowest cost. Elastomeric bridge bearings, bearing pads, neoprene.
December 2, 2015 revised expansion lengths for all elastomeric bearings. Mold together components of a laminated bearing to form an integral unit free of voids or separations. We are also approved by the research, design and standards organization rdso to manufacture and supply our bearings for all railway bridges. By accommodating superstructure displacements with shear strains, elastomeric bearings reduce maintenance requirements. Versiflex hlmr pot bearing assemblies are especially suited for curved or skewed bridges and other complex structures where the direction of. Introduction elastomeric bearings introduced nearly 60 years ago, laminated steelelastomer bearing pads are now in. Stanton elastomeric bearings have been used for many years. Analysis of elastomeric bridge bearings semantic scholar.
The laminated elastomeric bearing is an elastomeric rubber block reinforced with steel plates vulcanized when built. Compared to other types of bearings, they are easy to install, have a long life expectancy 100 years plus and are maintenance free. Shape factor of thickest elastomer layer of an elastomeric bearing. It complies with bs en and is primarily used in the construction industry.
Pdf analytical simulations of the steellaminated elastomeric. Ministry experience is that correctlydesigned elastomeric bearings have performed well and are a costeffective solution. The information included is intended to permit efficient fabrication, installation, and maintenance of these bearings. Depending on the area of application and country requirements maurer elastomeric bearings can be supplied in accordance with various standards, e. Pdhonline course c485 2 pdh fhwa bridge inspection manual section 9 bridge bearings 2012 instructor.
Versiflex hlmr pot bearing assemblies are suitable at locations where lowprofile, highload bearing devices are required. Laminated elastomeric bearings consist of natural rubber layers separated by steel plates. Wabo elastodec e bearings must be correctly positioned for optimum operation and long service life. Steel bridge, bearings, elastomeric bearing, highload. Elastomeric bearings would generally be positioned next to the uniguide bearing to take up the vertical load. In addition, they are easily installed and maintenance free. Before elastomeric bearings may be used for a department project, the manufacturer shall provide documentation that hisher product meets the requirements as specified in the standard specifications for road and bridge construction section 1083. Forward samples freight prepaid to the construction. The required design input at the strength limit state is shear force. Steel bridge bearing selection and design guide steel building. The shape factor for individual elastomer layers is the plan area divided by the area of the perimeter free to bulge. Ps free sliding pot bearing resists vertical load and allows horizontal movements and rotations. This paper presents a discussion of the rationale for the use of elastomeric bearings for steel trapezoidal box girders, a historical overview of bridge bearing systems in texas, and the. The purpose selected sealing systems of the elastomeric pad, are designed to resist extrusion of the elastomeric pad when under load.
Bridges bridge bearings types of bearings for bridge structures and details. They are economical and require minimual mainlenance, however, the hlstoric aashto design provisions have limited the range of applications of these bearings. D, pe retired pdh online pdh center 5272 meadow estates drive. Wisdot bridge manual chapter 27 bearings wisconsin dot. The main component of all elastomeric bearings is a neoprene pad that. These tried and tested systems have been installed all over the world for a long number of years. Installation elastomeric bearings pads based on aashto, bsc and din regulations. Traditionally, such is achieved by the use of a top and bottom attachment distribution plate cast into the structure, to which the bearing is bolted. Use banded elastomeric bearings are mainly used in the structures field for which this product has many advantages. Lower precast beam straightand direct on elastomeric bearing, and at most care should be taken to see. Nonguided elastomeric sliding bridge bearings page 4 of 5 51502 the departments representative shall select, at random, the required sample bearing s from completed lots of bearings, and samples of the elastomer. It consists of two curved plate that match each other as shown in figure 8. July 2019 276 the required design input for the design of an elastomeric bearing at the service limit state is dead load, live load plus dynamic load allowance, minimum vertical force due to permanent load, and design translation.
These items are then vulcanised to create a compact maintenance free bearing. Plain elastomeric bearings must be well vulcanized, uniform and integral units of such construction that the bearing is incapable of being separated by any. Bridge bearings support structures at a constant elevation, carrying forces from the superstructure into the. Specification 860 bridge bearings 0410146 issued 122018. Evaluation of full size elastomeric bridge bearing pads, dated june, 1974. Design step 6 design of bearings prestressed concrete. This iricen publication is a result of the desire to fill the gap.
Because of the desirable performance characteristics, maintenancefree dura bility,and. Bridge design manual 5, typical plan notes for repositioning of elastomeric bearings for steel. These bearings are suitable for high loads, displacements and rotations. In addition to the three bearings mentioned above, caltrans has used ptfe elastomeric bearings on several structures with large longitudinal displacements. Designed and sized to meet the needs of your structure, these bearings are rigid enough to transmit the necessary loads and flexible enough to permit the rotation and movement required by the structure. Around this makeup a rubber cover encapsulates the bearing. They are conformed by an elastomeric pad placed into a metallic pot, so as by means of a piston it is confined, bearing pressures near 30 nmm2 and rotations up to 0,03 rad, depending on the design standard.
Articulation is the term for the configuration of bridge supports and choice of structural bearings that provides the necessary restraints to the superstructure whilst at the same time providing freedom to some displacements and rotations in order to avoid unnecessary forces on both the superstructure and substructure due to constraint a range of different bearing types is available. These bearings should be considered for low to moderate load situations. Shape factor means the area of the loaded face of an elastomeric layer divided by the area free to bulge. Steel bridge design handbook bearing design volume 15. In use, natural rubber has proved superior to all other rubbers as bridge bearing material. Analytical simulations of the steellaminated elastomeric bridge bearing.
Steel bridge design handbook bearing design volume 15 fhwa. While covering the subject of bridge bearings during various courses at iricen the absence of a document covering all aspects of different types of bridge bearings was acutely felt. Bridge bearings types of bearings for bridge structures and details. Elastomeric bridge bearings have generally performed satisfactorily under current aashto and state dot materialstest methods and requirements. Fhwa bridge inspection manual section 9 bridge bearings. This surface shall be perfectly level and at least 5 cm greater than the bearings size. Disk bearings on the other hand have fewer documented failures than pot bearings. Bridge bearings are structural equipment or devices installed between bridge substructure and superstructure. Bridge bearings types of bearings for bridge structures. Modular sliding bearings are used to permit structural movement to take place. Elastomeric bearings goodco ztech elastomeric bearings are fabricated of natural rubber or neoprene. Elastomeric bearings high load multi rotational bear ings pot, spherical, disc.
Design of laminated elastomeric bridge bearings charles w. This bearing is the connection between a structure and its support, and should make the following possible through elastic deformation. Elastomeric bearings would generally be positioned next to the uniguide bearing. The material in this report will be of immediate interest to bridge designers and materials engineers. This is typically accomplished through the used of a tapered steel top plate. Recommended specifications for elastomeric bridge bearings, accom panied by a. To further enhance our bridge solutions we can now offer a full range of mechanical bridge joints, bearing pads and pot bearings in partnership with european, and long time manufacturer, etic.
Steel bridge bearing design and detailing guidelines section 1 elastomeric bearings 1. Plain pad and strip bearings unreinforced elastomeric pads and. The superstructure must be raised to replace bridge bearings. Elastomeric bearings for steel trapezoidal box girder bridges. Reinforced elastomeric bearings are an often used type of bridge bearings and already been installed in many kinds of structures all over the world. Key words steel bridge, bearings, elastomeric bearing, highload multirotational bearing, mechanical bearings 18. Elastomeric bridge bearings the elastomer when tested for compliance with the minimum requirements of aashto m 251. Flexible bearing rigid bearing bsec types of modern bridge bearings technical lecture series indian association of structural engineers bridge bearing types and functional properties general category bearing type. Information on bridge bearings is available in various technical literatures but it is scattered. Use cement mortar to construct mortar pads for elastomeric bearings, containing sufficient coarse sand to provide a rough texture on the contact face, conforming to clause 4. Article pdf available in journal of mechanics 3004. The function of trelleborg laminated bearings structures are subjected to imperceptible displacements and rotations that have to be accommodated to protect the structure and surrounding infrastructure. In location of bridge deck supports, for creation of a simple support with free rotation and restricted longitudinal displacement over piers or abutments, elastomeric bearings may be either plain consisting of elastomer only or laminated. Sizing of bearings is based on restricting these shears in accordance with current national or international regulations.
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