Basic bridge prototype model created using opensees to formulate the parametric study, the basic bridge will be modified as shown in table 1. Bridge bearings are small integral parts of the entire bridge structure serving several purposes, such as connection, transfer of forces, allowing movements, force damping etc. The former permits both translational and rotational movements whereas the latter allow rotational and limited translational movements. Overwrite options are located under brim bridge object abutments and bents. It is noted that stability is a part of bridge bearing design, and that bearings must be designed and detailed to meet required vertical and horizotal load capacities, rotation limits, and anchor bolt clearances. The bridge modeler locates bearing links directly below the girder web. Bridge bearings types of bearings for bridge structures and details. Carry high permanent compression loads with minimum compressive deflection.
Apr 23, 2015 bridge bearings until the middle of this century, the bearings used consisted of following types. Svi structural bearing design 10a design of elastomeric structural bearings structural bearing design. The rolling elements and both races slant inward, much like a cone. Bearing technologies pot bearings in most concrete and steel structures accommodation must be made for relative movement between structural members in order to avoid the buildup of dangerous. Several layers are placed on the bridge seat with the superstructure. Pot bearings are special types of bearing pads for taking larger loads, translation and rotation in confined areas. Introduction highway bridges traditionally have a system of expansion joint, abutment bearing and other structural releases to negotiate cyclic thermal expansion and contraction, creep and shrinkage, and are known as bearing bridges. Elastomeric bearings for steel trapezoidal box girder bridges. Steel bridge bearing design and detailing guidelines section 1 elastomeric bearings 1. Computational analyses of quasiisolated bridges with fusing. Analysis of elastomeric bridge bearings ctr library. Bearings in this catalog are arranged by bearing type, with a size andor numerical listing. The bridge became impassable after the failure of 40 78 astm a490 bolts at the northwest bearing caused the bridge to lift approximately 600 mm at the northwest corner.
The designer must determine which bearing type is best suited to cost effectively accommodate the design requirements. In general, there are two types of supports shown on plans, fixed f or expansion e. If you extend a line along the surface of the races and rollers, and also draw one through the bearing s axis, those lines would all meet at a common point fig. Bridge bearings types of bearings for bridge structures. Get bridge bearings at best price with product specifications.
There are several types of bridge bearings which have been employed in. Pot bearings for bridges and structures dec 2012 bearing technologies. It achieves this by using at least two races to contain the balls and transmit the loads through the balls. Bearing used in the construction of bridge structure is divided into two major categories namely expansion bearings and fixed bearings. A support with a f will have a bearing device that will resist longitudinal movements.
Section 2 special design requirements for different bearing types. The information included is intended to permit efficient. Find here information of bridge bearings selling companies for your buy requirements. Bridge articulation and bearing specification from 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. Steel bridge bearings may be divided into three general types. Steel bridge bearing selection and design guide steel building. A ball bearing is a type of rollingelement bearing which uses balls to maintain the separation between the moving parts of the bearing. These bearings are used in bridges, but similar layers may be found roads, docks, airports and other structures where large and heavy objects need to operate safely. 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.
Bridge bearings until the middle of this century, the bearings used consisted of following types. Bearings and expansion joints chapter 9 wsdot bridge design manual m 2350. To model a different bearing layout, delete the links automatically created, then, outside. Van lund, washington state department of transportation the washington state department of transportation wsdot has removed and replaced nonfunctioning bridge bearings to extend the service lives of existing bridges. Pin bearing a pin bearing is a type of fixed bearings that accommodates rotations through the use of a steel. The bridge designer will prohibit movement in some bearings and allow movement in others. Characterization of bridge foundations workshop report. Of all the bearings mentioned, the reinforced elastomeric bearing introduced in 1955 has been. B standard type the design contents can be altered according to different bearing structures c exampleb indicates nominal contact angle40 for angular contact ball bearings, ant it d indicates the increased contact angle for tapered roller bearings. Anulab pot cum ptfe bridge bearing 260 mt rotation test as per irc 83 part iii.
A wide variety of types of bridge bearings options are available to you, such as single row. Inoperable roller nests and seismically vulnerable. Bridge standards and procedures manual volume 1 section. A wide variety of types of bridge bearings options are available to you, such as number of row. The target of this paper is to give a very short stateoftheartreport on bearings and expansion. About 0% of these are deep groove ball bearing, 0% are taper roller bearing, and 0% are pillow block bearing.
Pin bearing a pin bearing is a type of fixed bearings that accommodates rotations through the use of a steel translational movements are not allowed. Contact verified bridge bearings manufacturers, bridge bearings suppliers, bridge bearings exporters wholesalers, producers, retailers and traders in india. Bearing types ccl designs bespoke bearings to exacting standards. Possible causes of movement are thermal expansion and contraction, creep, shrinkage, or fatigue due to the properties of the material used for the bearing. Users may specify different girderbearing properties at each bent and abutment. Section 11 joints and bearings october 28 2016 6 bc moti. Comparative study of bearing and integral type bridges as. The target of this paper is to give a very short state of theartreport on bearings and expansion. The crossdiscipline workshop included key staff members from the federal highway administration fhwa hydraulics, geotechnical and structural disciplines brainstorming with stakeholders. 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. Lt bearing with the grease for lower temperature, the additional letter is the same meaning as ht mt bearing with the grease for medium temperature, the additional letter is the same meaning as ht lht bearing with the grease for lower or higher temperature, the additional letter is the same meaning as ht.
In order to meet the special requirements of the bridge structure in foshan west railway station, all the bridges of this station adopt the spherical bridge bearing of railway bridge which vertical capacity covers 11 levels from 300022500kn and designed allowable rotation is 0. Becker research report number 45 research project 04 elastomeric bearings conducted for the texas department of transportation in cooperation with the u. These bearings are used in bridges, but similar layers may be found roads, docks, airports and other structures where large. Bridge bearings types of bearings for bridge structures and. Inspection and evaluation of bridge bearings topic 9. A wide variety of bridge bearing types options are available to you, such as aisi, gb.
Users may specify different girder bearing properties at each bent and abutment. State highway administration research report investigation of the performance of elastomeric bearings on maryland concrete bridges c. Fixed bearing used on bridge repair projects for replacement of existing bearings where there is insufficient height available for a curved plate bearing assembly, consisting of a steel reinforced elastomeric pad with bearing plate and anchor rods, sized to match the height of the existing bearing. Wsdots special provisions require that adequate concrete consolidation be. Modern bridge bearings and expansion joints for road bridges. A bridge bearing is a construction method that allows a bridge to transfer forces from its deck down into its foundation without damage. Bearing can relate to pile bearing capacity, or it can relate to the centerline of the girder profile, the point where the girder rests on the pier cap, or it can be a mechanical or physical type of attachment be.
Mageba website bridge bearings and expansion joints r. Nipigon river bridge west abutment bearing technical investigation bro059 1. The following bridge bearing elastomer formulations are approved in accordance with item. There are several different types of bridge bearings which are used depending on a number of different factors including the bridge span, loading conditions. The design shall accommodate the coefficient of thermal expansion of hdpe which is an order of magnitude greater than steel. The latest design software and fea is used to optimise bearing design for efficiency and cost. Pdf a bearing is a machine element which supports another moving machine element known as journal. The construction layout sheet in the plans will show the designers intent. A listing of businesses for sale currently represented by bridge mergers and acquisitions. This article throws light upon the top seven types of bearings used under the bridges. Pot bearings are often regarded as suitable for use when bridge bearing rotations are too large. Each bearing listing includes the appropriate dimensions.
This report summarizes the findings from the characterization of bridge foundations workshop held in arlington, va, from april 30 to may 1, 20. The information included is intended to permit efficient fabrication, installation, and maintenance of these bearings. Design criteria for bridges and other structures, transport and main roads, march 2020 i. Bearings are made to order to conform to all relevant local and. Nipigon river bridge west abutment technical investigation. Steel bridge bearing design and detailing guidelines aashtonsba steel bridge collaboration, 2004. Pdf modern bridge bearings and expansion joints for road. Bridge bearings and stability transportation research board. Charlotte area landscape hardscape maintenance business primarily residential inquire. Forty 40 rods radiate out from a center cap stand like spokes on a bicycle and hold 40 20inch diameter wheels onto a rim bearing haer ala,36bripo. However, bridge bearings could create more problems for the bridge structure than it solves if not properly understood, especially. Slopes for drainage troughs shall be maximized and where possible, the. Bearing pads are either plain or reinforced with respect to the loads defined. The obstacle to be crossed may be a river, a road, railway or a valley.
Steel bridge design handbook bearing design volume 15. The required passage may be for a road, a railway, pedestrians, a canal or a pipeline. If the specific bearing type is not known, reference the index in the back of the guide for the page number where the bearing is listed. The purpose of a ball bearing is to reduce rotational friction and support radial and axial loads. However, all these were but attempts to combine the increased demands on bridge constructions with an old bearing technology. Precast and prestressed concrete buildings with structural steel beams. Delivering quality at every stage, all bridge bearings are designed individually to exacting standards using high specification materials from approved sources. Where hdpe material is used for joint drainage, the material shall be uvresistant. Ccls quality management system complies with en iso 9001. Our atlas bearing pads are made of natural or neoprene blends that meet the aashto standard specifications for highway bridge bearing pads. Fhwa bridge inspection manual section 9 bridge bearings. Department of transportation federal highway administration by the center for transportation research.
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