A complete description of all types is beyond the scope of this text. 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. This bridge is a five span bridge 12m between axes, making the total length of the bridge to be 60m long. Bridge bearing devices are classifi ed as fixed or expansion. What links here related changes upload file special pages permanent link page information wikidata item cite this page.
Bearing used in the construction of bridge structure is divided into two major categories namely expansion bearings and fixed bearings. University of washington selection of bearings for steel bridges this selection guide facilitates the process of selecting costeffective and appropriate bearing systems for steel girder bridges. Navigate to the folder you chose for the collection. Furnishes information to the joint seals and bearings committee so that problem areas can be evaluated as soon as possible. The three new bearing types most widely used today in the united states are pot, spherical and disk. Compare the pdf file with the dgn file for validation on correct fonts displayed in microstation. In addition, we will feature one particular type the tapered roller bearing which has numerous fleet applications. The most common bearing application is the ball bearing. Fixe d devices are called bolsters and only allow rotation at that support location. The superstructure must be raised to replace bridge bearings. We have been focusing on research and development in recent years and we have made great achievement in this industry. Aashto type iii prestressed concrete girder continuous for live load. Pf fixed pot bearing resists vertical load and provides restraint in all horizontal directions.
Bearing pads are either plain or reinforced with respect to the loads defined. Media in category bridge bearings the following 99 files are in this category, out of 99 total. In the course of the past two centuries bridge bearings evolved as parts of. The design of the bearing may, for example, provide for free linear movement of the moving part or for free rotation around a fixed axis. Each bearing listing includes the appropriate dimensions. Chapter xi superstructure maintenance procedures page xi7 bridge maintenance training reference manual b. 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.
Roller bearing one variation of roller bearings the tapered roller is used. Another type of bearing consists of oilsoaked felt or tar paper that has been dusted with graphite. Bridge bearings until the middle of this century, the bearings used consisted of following types. Full text of structural bearings and expansion joints for. Bearings gives the supporting conditions to super structure.
Contact dave kiekbusch for questions about this page. Although many different types of bridge bearings have been used by the nysdot, elastomeric and multirotational bearings are the. In partnership with the client, ccl can design a unique bearing that meets all specifications. A bearing is a machine element that constrains relative motion to only the desired motion, and reduces friction between moving parts. These are the plain conical and taper types, cupandcone ball bearings, standard journal ball bearings l3 of journal load as thrust and taper roller bearings. Inspection and evaluation of bridge bearings topic 9. University of washington selection of bearings for steel bridges this selection guide facilitates the process of selecting costeffective and appropriate bearing systems for. A drawing showing the bearing layout should include the following. The purpose of a bearing is to allow controlled movement and thereby reduce the stresses involved. In addition to the single row design, there also are double row, angular contact and ball thrust bearings. Section 2 special design requirements for different bearing types. Pot type bearing assembly prestressed concrete beams guided expansion nov. Bridge bearings indian association of structural engineers. Oct 22, 2019 concrete relief joint detail bridge reconstruction on trunk highway bridges nov.
The tests may be conducted inthe laboratory of the manufacturer or in. This movement is either rotary shaft rotating within a mount or linear one surface moving along another. There are several types of bridge bearings which have been employed in. Computational analyses of quasiisolated bridges with. The effects of the thickness of the bearing plate, size of the concrete substructure, ratio of. 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. Bridge bearings types of bearings for bridge structures and details.
Bearings, are antifriction devices, each having different antifriction characteristics. Pdf management system for road bridge structural bearings. Any of the mechanical bearings can be converted to uplift type. For proper display of bridge standards in microstation extract these font files into the c. This is a simple but effective bearing that is commonly used on short span concrete slabs and girders that sit on concrete abutments. Bearings in this catalog are arranged by bearing type, with a size andor numerical listing.
When the direction of the load weight being moved is at right angles to the shaft, it is called a radial load. Bearing is the component of bridge on which the girder in case of girder bridge, or solid slabin case of slab bridge rests. Wisconsin department of transportation bridge manual. The characteristics and uses of each type will be covered in chapter five. The maximum allowable compressive stress on the bearing is a function of the shear modulus. Function of bearings for bridges bridge bearings are used to transfer forces from the superstructure to the substructure, allowing the following.
December 2, 2015 reduced type iii bearing load capacity. This module provides practical information for efficient bearing design and. Steel bridge bearing selection and design guide steel building. Bridge bearings types of bearings for bridge structures. Pot bearings are special types of bearing pads for taking larger loads, translation and rotation in confined areas. Steel bridge bearings may be divided into three general types. New york state department of transportation coordinates operation of transportation facilities and services including highway, bridges, railroad, mass transit, port, waterway and aviation facilities. We will discuss both categories, and cover bearing types, installation, operating conditions, maintenance and troubleshooting. 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. Computational analyses of quasiisolated bridges with fusing bearing components e. Kansas department of transportation bridge construction manual version 107 kdot bridge section 10. Files the joint movements calculations forms, and makes sufficient recordings of each joint to evaluate joint movement or changes.
Kansas department of transportation bridge construction manual version 107 kdot bridge section 11. Possible causes of movement are thermal expansion and contraction, creep, shrinkage, or fatigue due to the properties of the material used for the bearing. The required passage may be for a road, a railway, pedestrians, a canal or a pipeline. Bridge bearings types of bearings for bridge structures and. A read is counted each time someone views a publication summary such as the title, abstract, and list of authors, clicks on a figure, or views or downloads the fulltext. Bridge lines, bridge fonts pdf, 267kb bridge font true type font format. Approved, and signed, november 02, 2017 new detail. The former permits both translational and rotational movements whereas the latter allow rotational and limited translational movements. Include this detail when using bearing assembly details b304, b309, b310, b311, b354, or b355. Ball bearing the most popular type of ball bearing has a single row of balls. Several layers are placed on the bridge seat with the superstructure placed directly on it. Another type of bridge bearing is the mechanical bridge bearing. In situations where bridge skew angles exceed 30 degrees, consult the bearing and expansion joint specialist and the bridge design engineer for recommendations and approval. Standard drawings standard specification drawing files in dgn and pdf formats.
The superstructure consists of eleven 11 rectangular precast concrete beams of section 600 deep x 350 mm web width. Wisconsin department of transportation bridge manual 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. A bridge bearing is a component of a bridge which typically provides a resting surface between bridge piers and the bridge deck. This website and documents are provided for use by persons outside of the kansas department of transportation as information only. Moved from the notes payment for elastomeric bearing pad, type 1, included in item elastomeric bearing pad per each.
Use l type abutments with expansion joints at the bridge ends where bridge length exceeds these values. The oldest form of bridge bearing is simply two plates resting on top of each other. Apr 23, 2015 bridge bearings until the middle of this century, the bearings used consisted of following types. There are several different types of bridge bearings which are used depending on a number. The obstacle to be crossed may be a river, a road, railway or a valley. Bridge and structures detailing policy manual page i revision summary. Pin bearing a pin bearing is a type of fixed bearings that accommodates rotations through the use of a steel. During conventional bridge construction, bridge bearings are set during the erection of. Elastomeric bearing type ii and iii the sampling procedure is the same as for the type i bearing. The applicable specification shall be referred to in the certification. There are several types of mechanical bridge bearing, such as the pinned bearing, which in turn includes specific types. Several layers are placed on the bridge seat with the superstructure. Sci p185 guidance notes on best practice in steel bridge construction.
Bearing types and application design ball bearings roller. Pdf a bearing is a machine element which supports another moving machine element known as journal. Bearings are elements transferring vertical loads from. Loading analysis of existing pipelines common design guidelines 2008 c11. Trbs second strategic highway research program shrp 2 report s2r19arw2. Behavior of masonry bearing plates in highway bridges. It shall show the limits of test values for the specified tests and shall certify that the materials furnished comply with the specifications. Computational analyses of quasiisolated bridges with fusing. Ball bearing types permit smooth, lowfriction movement between two or more surfaces. Bearings maintenance and repairs introduction bearings transmit the dead load of the superstructure and the live e. Bridge bearings are used to transfer forces from the superstructure to the substructure, allowing the following types of movements of the superstructure. Mn dot bridge office bridge details manual part i bdetails minnesota department of transportation 3485 hadley avenue north mail stop 610. The designer must determine which bearing type is best suited to cost effectively accommodate the design requirements. The bearings with which we are concerned fit two basic categories ball and roller.
The bearing pad restraint bdetail was developed to detail the restraint bars for multiple elastomeric bearing pad configurations. Computational analyses of quasiisolated bridges with fusing bearing. As a result of adopting the aashto provisions of 14. Bearings transfers loads from super structure to sub struc. 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. Four specimens of the concrete substructure are cast in two different sizes and strain gages embedded in the concrete at several locations. A bridge bearing is a component of a bridge which typically provides a resting surface between. A common form of modern bridge bearing is the elastomeric bridge bearing. Type b certification shall be prepared by the manufacturer. Inoperable roller nests and seismically vulnerable. Steel bridge design handbook bearing design volume 15. Collectively, these bearings are known as high load multi.
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