Inoperable roller nests and seismically vulnerable. Pdf modern bridge bearings and expansion joints for road. 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. Comparative study of bearing and integral type bridges as. Bearing types ccl designs bespoke bearings to exacting standards. 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. Several layers are placed on the bridge seat with the superstructure. The latest design software and fea is used to optimise bearing design for efficiency and cost. About 0% of these are deep groove ball bearing, 0% are taper roller bearing, and 0% are pillow block bearing.
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. These bearings are used in bridges, but similar layers may be found roads, docks, airports and other structures where large. Find here information of bridge bearings selling companies for your buy requirements. 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. Each bearing listing includes the appropriate dimensions. Get bridge bearings at best price with product specifications. A support with a f will have a bearing device that will resist longitudinal movements. Wsdots special provisions require that adequate concrete consolidation be. Becker research report number 45 research project 04 elastomeric bearings conducted for the texas department of transportation in cooperation with the u. Users may specify different girder bearing properties at each bent and abutment. 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. Overwrite options are located under brim bridge object abutments and bents. Nipigon river bridge west abutment bearing technical investigation bro059 1.
Bearing used in the construction of bridge structure is divided into two major categories namely expansion bearings and fixed bearings. 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. Bearings are made to order to conform to all relevant local and. 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. This article throws light upon the top seven types of bearings used under the bridges. Pin bearing a pin bearing is a type of fixed bearings that accommodates rotations through the use of a steel. The target of this paper is to give a very short stateoftheartreport on bearings and expansion. Watson website bridge bearings and expansion joints technoslide bridge bearings.
Bridge bearings types of bearings for bridge structures. Our atlas bearing pads are made of natural or neoprene blends that meet the aashto standard specifications for highway bridge bearing pads. It achieves this by using at least two races to contain the balls and transmit the loads through the balls. Bearings in this catalog are arranged by bearing type, with a size andor numerical listing. Where hdpe material is used for joint drainage, the material shall be uvresistant. However, bridge bearings could create more problems for the bridge structure than it solves if not properly understood, especially. Users may specify different girderbearing properties at each bent and abutment.
Bearings and expansion joints chapter 9 wsdot bridge design manual m 2350. The following bridge bearing elastomer formulations are approved in accordance with item. 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. 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 standards and procedures manual volume 1 section. Steel bridge bearings may be divided into three general types. Inspection and evaluation of bridge bearings topic 9. There are several different types of bridge bearings which are used depending on a number of different factors including the bridge span, loading conditions. 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. Pot bearings are special types of bearing pads for taking larger loads, translation and rotation in confined areas. The information included is intended to permit efficient.
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. This module provides practical information for efficient bearing design and. 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. A wide variety of types of bridge bearings options are available to you, such as single row. Delivering quality at every stage, all bridge bearings are designed individually to exacting standards using high specification materials from approved sources. Most structures require a mixture of bearing types and clients are advised to contact ccl at an early stage to ensure bearings are designed that perfectly match the structure requirements. Modern bridge bearings and expansion joints for road bridges.
Contact verified bridge bearings manufacturers, bridge bearings suppliers, bridge bearings exporters wholesalers, producers, retailers and traders in india. Computational analyses of quasiisolated bridges with. Pdf a bearing is a machine element which supports another moving machine element known as journal. Elastomeric bearings for steel trapezoidal box girder bridges. Bridge bearings and stability transportation research board. A bridge bearing is a component of a bridge which typically provides a resting surface between bridge piers and the bridge deck. Bridge bearings technical knowledge base computers and. Precast and prestressed concrete buildings with structural steel beams. The obstacle to be crossed may be a river, a road, railway or a valley. 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. Pot bearings for bridges and structures dec 2012 bearing technologies.
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. The information included is intended to permit efficient fabrication, installation, and maintenance of these bearings. Mageba website bridge bearings and expansion joints r. Bridge bearings until the middle of this century, the bearings used consisted of following types. Bearing pads are either plain or reinforced with respect to the loads defined. Ccls quality management system complies with en iso 9001. However, all these were but attempts to combine the increased demands on bridge constructions with an old bearing technology. Fhwa bridge inspection manual section 9 bridge bearings. Steel bridge bearing design and detailing guidelines aashtonsba steel bridge collaboration, 2004.
Section 11 joints and bearings october 28 2016 6 bc moti. The required passage may be for a road, a railway, pedestrians, a canal or a pipeline. The rolling elements and both races slant inward, much like a cone. Section 2 special design requirements for different bearing types. The construction layout sheet in the plans will show the designers intent. Charlotte area landscape hardscape maintenance business primarily residential inquire. Analysis of elastomeric bridge bearings ctr library. Bridge bearings types of bearings for bridge structures and. The bridge designer will prohibit movement in some bearings and allow movement in others. The crossdiscipline workshop included key staff members from the federal highway administration fhwa hydraulics, geotechnical and structural disciplines brainstorming with stakeholders. The bridge modeler locates bearing links directly below the girder web. A wide variety of types of bridge bearings options are available to you, such as number of row. The purpose of a ball bearing is to reduce rotational friction and support radial and axial loads. The target of this paper is to give a very short state of theartreport on bearings and expansion.
Bridge bearings are used to transfer forces from the superstructure to the substructure, allowing the following types of movements of the superstructure. Bridge bearings types of bearings for bridge structures and details. 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. To model a different bearing layout, delete the links automatically created, then, outside. Of all the bearings mentioned, the reinforced elastomeric bearing introduced in 1955 has been. Characterization of bridge foundations workshop report. Slopes for drainage troughs shall be maximized and where possible, the. A listing of businesses for sale currently represented by bridge mergers and acquisitions. Design criteria for bridges and other structures, transport and main roads, march 2020 i. State highway administration research report investigation of the performance of elastomeric bearings on maryland concrete bridges c.
The purpose of a bearing is to allow controlled movement and thereby reduce the stresses involved. The design shall accommodate the coefficient of thermal expansion of hdpe which is an order of magnitude greater than steel. 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. Anulab pot cum ptfe bridge bearing 260 mt rotation test as per irc 83 part iii. Pot bearings are often regarded as suitable for use when bridge bearing rotations are too large. Apr 23, 2015 bridge bearings until the middle of this century, the bearings used consisted of following types. Department of transportation federal highway administration by the center for transportation research. The former permits both translational and rotational movements whereas the latter allow rotational and limited translational movements. Steel bridge design handbook bearing design volume 15. A wide variety of bridge bearing types options are available to you, such as aisi, gb. In general, there are two types of supports shown on plans, fixed f or expansion e. Bridge bearings used to support bridge or structural beams. Carry high permanent compression loads with minimum compressive deflection. Steel bridge bearing design and detailing guidelines section 1 elastomeric bearings 1.
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. A ball bearing is a type of rollingelement bearing which uses balls to maintain the separation between the moving parts of the bearing. Possible causes of movement are thermal expansion and contraction, creep, shrinkage, or fatigue due to the properties of the material used for the bearing. 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. Nipigon river bridge west abutment technical investigation. The designer must determine which bearing type is best suited to cost effectively accommodate the design requirements. Steel bridge bearing selection and design guide steel building.
This report summarizes the findings from the characterization of bridge foundations workshop held in arlington, va, from april 30 to may 1, 20. Basic bridge prototype model created using opensees to formulate the parametric study, the basic bridge will be modified as shown in table 1. There are several types of bridge bearings which have been employed in. Computational analyses of quasiisolated bridges with fusing. 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. Svi structural bearing design 10a design of elastomeric structural bearings structural bearing design.
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