Elastomeric bridge bearings pdf free

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. These items are then vulcanised to create a compact maintenance free bearing. 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. Depending on the area of application and country requirements maurer elastomeric bearings can be supplied in accordance with various standards, e. Recommended specifications for elastomeric bridge bearings, accom panied by a. The surface of contact between concrete and bearing shall be smooth, free from protruding parts and clean, to afford perfect seating of bearing. Use banded elastomeric bearings are mainly used in the structures field for which this product has many advantages. Mold together components of a laminated bearing to form an integral unit free of voids or separations. Elastomeric bearings goodco ztech elastomeric bearings are fabricated of natural rubber or neoprene.

Stanton elastomeric bearings have been used for many years. Because of the desirable performance characteristics, maintenancefree dura bility,and. Plain elastomeric bearings must be well vulcanized, uniform and integral units of such construction that the bearing is incapable of being separated by any. By accommodating superstructure displacements with shear strains, elastomeric bearings reduce maintenance requirements. Information on bridge bearings is available in various technical literatures but it is scattered. Steel bridge, bearings, elastomeric bearing, highload. Introduction elastomeric bearings introduced nearly 60 years ago, laminated steelelastomer bearing pads are now in. Ministry experience is that correctlydesigned elastomeric bearings have performed well and are a costeffective solution. Ps free sliding pot bearing resists vertical load and allows horizontal movements and rotations. 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.

Evaluation of full size elastomeric bridge bearing pads, dated june, 1974. 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. Bridge design manual 5, typical plan notes for repositioning of elastomeric bearings for steel. Elastomeric bridge bearings have generally performed satisfactorily under current aashto and state dot materialstest methods and requirements.

If curved bearing is cylindrical, then it only accommodates rotation movements. Bridges bridge bearings types of bearings for bridge structures and details. Elastomeric bearings for steel trapezoidal box girder bridges. Modular sliding bearings are used to permit structural movement to take place. This surface shall be perfectly level and at least 5 cm greater than the bearings size. Installation elastomeric bearings pads based on aashto. 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. Compared to other types of bearings, they are easy to install, have a long life expectancy 100 years plus and are maintenance free. In addition, they are easily installed and maintenance free. Installation elastomeric bearings pads based on aashto, bsc and din regulations.

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. Although many different types of bridge bearings have been used by the nysdot, elastomeric and multirotational bearings are the. Elastomeric bridge bearings, bearing pads, neoprene. It complies with bs en and is primarily used in the construction industry. Analytical simulations of the steellaminated elastomeric bridge bearing. 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. All this is encompassed in a unit having the lowest cost. Laminated elastomeric bearings consist of natural rubber layers separated by steel plates. Bridge bearings types of bearings for bridge structures and details. This iricen publication is a result of the desire to fill the gap. The superstructure must be raised to replace bridge bearings. It consists of two curved plate that match each other as shown in figure 8. Plain pad and strip bearings unreinforced elastomeric pads and.

Elastomeric bridge bearings the elastomer when tested for compliance with the minimum requirements of aashto m 251. Steel bridge design handbook bearing design volume 15 fhwa. The material in this report will be of immediate interest to bridge designers and materials engineers. Wisdot bridge manual chapter 27 bearings wisconsin dot. Around this makeup a rubber cover encapsulates the bearing. Lower precast beam straightand direct on elastomeric bearing, and at most care should be taken to see. These bearings are suitable for high loads, displacements and rotations. These bearings should be considered for low to moderate load situations. The required design input at the strength limit state is shear force. 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. Forward samples freight prepaid to the construction. The purpose selected sealing systems of the elastomeric pad, are designed to resist extrusion of the elastomeric pad when under load. Steel bridge design handbook bearing design volume 15. Design step 6 design of bearings prestressed concrete. Steel bridge bearing selection and design guide steel building.

Disk bearings on the other hand have fewer documented failures than pot bearings. 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. This bearing is the connection between a structure and its support, and should make the following possible through elastic deformation. 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. 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. Article pdf available in journal of mechanics 3004. Bridge bearings support structures at a constant elevation, carrying forces from the superstructure into the. 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. The bearing accommodates for displacements in both plane directions, rotations enabled, and does not transmit any horizontal. Elastomeric bearings would generally be positioned next to the uniguide bearing to take up the vertical load. Bridge bearings types of bearings for bridge structures.

Pot bearings trelleborg infrastructure pdf catalogs. Design of laminated elastomeric bridge bearings charles w. Trbs second strategic highway research program shrp 2 report s2r19arw2. Elastomeric bearings can absorb horizontal movements in every direction and rotational movements around every axis through elastic layers deformation. These tried and tested systems have been installed all over the world for a long number of years.

The laminated elastomeric bearing is an elastomeric rubber block reinforced with steel plates vulcanized when built. Analysis of elastomeric bridge bearings semantic scholar. Elastomeric bearings need to transmit loads and accommodate horizontal movements and rotations around each axis that can occur between two structures. Key words steel bridge, bearings, elastomeric bearing, highload multirotational bearing, mechanical bearings 18. M25106ul plain and laminated elastomeric bridge bearings. In addition to the three bearings mentioned above, caltrans has used ptfe elastomeric bearings on several structures with large longitudinal displacements. Wabo elastodec e bearings must be correctly positioned for optimum operation and long service life.

Versiflex hlmr pot bearing assemblies are especially suited for curved or skewed bridges and other complex structures where the direction of. Steel bridge bearing design and detailing guidelines section 1 elastomeric bearings 1. Design analyses will determine the scale of the forces and deformations. Elastomeric bearings high load multi rotational bear ings pot, spherical, disc. Shape factor means the area of the loaded face of an elastomeric layer divided by the area free to bulge. Specification 860 bridge bearings 0410146 issued 122018. The information included is intended to permit efficient fabrication, installation, and maintenance of these bearings. Reinforced elastomeric bearings are an often used type of bridge bearings and already been installed in many kinds of structures all over the world. D, pe retired pdh online pdh center 5272 meadow estates drive. The main component of all elastomeric bearings is a neoprene pad that. 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.

Pdf analytical simulations of the steellaminated elastomeric. Bridge bearings are structural equipment or devices installed between bridge substructure and superstructure. 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. Elastomeric bearings would generally be positioned next to the uniguide bearing. The shape factor for individual elastomer layers is the plan area divided by the area of the perimeter free to bulge.

December 2, 2015 revised expansion lengths for all elastomeric bearings. Background june 1994 information and field study 6. Sizing of bearings is based on restricting these shears in accordance with current national or international regulations. 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. Maurer structural bearings state of the art of sustainable solutions. They are economical and require minimual mainlenance, however, the hlstoric aashto design provisions have limited the range of applications of these bearings. 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. Fhwa bridge inspection manual section 9 bridge bearings. Shape factor of thickest elastomer layer of an elastomeric 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. 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. This is typically accomplished through the used of a tapered steel top plate. We are also approved by the research, design and standards organization rdso to manufacture and supply our bearings for all railway bridges.

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