Steel bridge bearings may be divided into three general types. The former permits both translational and rotational movements whereas the latter allow rotational and limited translational movements. Depending on the area of application and country requirements maurer elastomeric bearings can be supplied in accordance with various standards, e. 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. A sole plate may also be embedded into the bottom flange of a prestressed concrete girder. Generally, all types of machinery are provided with supports for rotating shafts, the supporting device is known as a bearing. Bearing is the component of bridge on which the girder in case of girder bridge, or solid slabin case of slab bridge rests. Section 2 special design requirements for different bearing types. Ccls quality management system complies with en iso 9001. The construction layout sheet in the plans will show the designers intent. We will discuss both categories, and cover bearing types, installation, operating conditions, maintenance and troubleshooting. 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.
This module provides practical information for efficient bearing design and. This iricen publication is a result of the desire to fill the gap. A wide variety of types of bridge bearings options are available to you, such as single row. Bridge bearings until the middle of this century, the bearings used consisted of following types.
There are several types of bridge bearings which have been employed in. 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. Analysis of elastomeric bridge bearings ctr library. Memo to designer s 71 june 1994 bridge bearings introduction aashto defines a bearing as a structural device that transmits loads while facilitating translation andor rotation. The required passage may be for a road, a railway, pedestrians, a canal or a pipeline. Thankfully, now you can play free online bridge any time you want with this meticulously crafted version. This movement is either rotary shaft rotating within a mount or linear one surface moving along another. Linear bearing types range from ball bearing cagesessentially bare cages holding balls that are often used as diepost bushingsto recirculating ball designs where the balls roll linearly along the shaft and then return to their starting points through channels on the nonshaft sides of the bearings. Astm d4014 032018 standard specification for plain and. Assuming the application is correct to begin with, maximizing longevity means bearings must be properly installed, lubricated and maintained. Moline type e tapered roller bearings offer many advantages including highspeed suitability, positive locking to the shaft, ruggedness, and low price. Maurer structural bearings vibrations, rotations and powerful forces bridges and superstructures may under go a turbulent life. 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 purpose of a bearing is to allow controlled movement and thereby reduce the stresses involved.
A bridge bearing is a component of a bridge transmitting the loads received from the deck on to the substructure and to allow controlled movement due to temperature variation or seismic activity and thereby reduce the stresses involved. Bearing is a machine element that have constrained relative motions and used to reduces friction between moving parts of machine to obtain desired motion or we can say that the machine elements which are support the rotating parts of a machine and reduce friction are called bearings. 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. The designer must determine which bearing type is best suited to cost effectively accommodate the design requirements. We have been focusing on research and development in recent years and we have made great achievement in this industry. The latest design software and fea is used to optimise bearing design for efficiency and cost. Bearings in this catalog are arranged by bearing type, with a size andor numerical listing. The obstacle to be crossed may be a river, a road, railway or a valley. 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. Bearing a bridge bearing consists of four basic elements. Suitability this type of bridge bearings is suitable for 12 to 20m span of a steel girder bridge. Several layers are placed on the bridge seat with the superstructure. Bearings can be fixed in both the longitudinal and transverse directions, fixed in one directi on and expansion in the other, or expansion in both directions. Bridge standard details are not standard plans and are subject.
Maurer structural bearings ensure at any place that these impacts remain as long as possible without consequences. Bridge bearings are used to transfer forces from the superstructure to the substructure, allowing the following types of movements of the superstructure. Section 14 discusses the design requirements for bearings. Type e tapered roller bearings jamieson equipment co. Made in the usa of high quality class 30 cast iron, they are precision machined to close tolerances.
Ball bearings, as shown below, are probably the most common type of bearing. With high strengthened steel body, spherical bearing is especially designed for high vertical, horizontal and. Bearings maintenance and repairs introduction bearings transmit the dead load of the superstructure and the live e. Spherical bearing, also called spherical bridge bearing, is one type of bridge bearings with large rotation capacity. Bridge bearings 2 types of bearings for a girder bridge. The information included is intended to permit efficient fabrication, installation, and maintenance of these bearings. Midas e learning midsa civil bearings, piers and abutments part 1. They are found in everything from inline skates to hard drives. Apr, 2018 learn hoe to design steel foot over bridge with a simple method. Another type of bridge bearing is the mechanical bridge bearing. Steel bridge, bearings, elastomeric bearing, highload.
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. Ball bearing types permit smooth, lowfriction movement between two or more surfaces. Bridge bearings types of bearings for bridge structures. 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.
Precision ball bearings are designed to have a long and useful iie. Sole plate the sole plate is a steel plate that is attached to the bottom of girders or beams or truss chords. Bridge bearings indian association of structural engineers. Steel bridge design handbook bearing design volume 15. There are several different types of bridge bearings which are used depending on a number of different factors including the bridge span, loading conditions. This type of bearing avoids the concentration of reaction at the inner edge of the bearing and thus distributes the load more uniformly over the abutment. Bridge design guide txdot january 2020 feedback for txdot policy on designing bridges, please refer to the txdot bridge design manual lrfd. Reinforced elastomeric bearings are an often used type of bridge bearings and already been installed in many kinds of structures all over the world. Bridge bearings types of bearings for bridge structures and details. Similar with pot bearing, spherical bearing also can be divided into three types. The bridge designer will prohibit movement in some bearings and allow movement in others. Steel bridge bearing selection and design guide steel building. Analysis of elastomeric bridge bearings semantic scholar.
Bearings gives the supporting conditions to super structure. Bearing is defined by websters to be a support or supporting part a bearing is a component that allows for relative motion between parts your skeleton is the central structure that supports your body your bodys joints are bearings that allow different parts to move bearings can have many forms, but only two types. Design of ntype steel foot over bridge part 1 youtube. Information on bridge bearings is available in various technical literatures but it is scattered. Inspection and evaluation of bridge bearings topic 9. Basic bridge prototype model created using opensees to formulate the parametric study, the basic bridge will be modified as shown in table 1. However, no attempt has been made to ensure that there were no errors in the conversion process. Wisdot bridge manual chapter 27 bearings wisconsin dot. In general, there are two types of supports shown on plans, fixed f or expansion e. 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. Bearings are made to order to conform to all relevant local and. A common form of modern bridge bearing is the elastomeric bridge bearing. In this article, you will learn about bearings its working, classification, different types of bearings and more. A wide variety of bridge bearing types options are available to you, such as aisi, gb.
Inoperable roller nests and seismically vulnerable. Possible causes of movement are thermal expansion and contraction, creep, shrinkage, or fatigue due to the properties. Apr 23, 2015 bridge bearings until the middle of this century, the bearings used consisted of following types. This website and documents are provided for use by persons outside of the kansas department of transportation as. Bridge bearings types of bearings for bridge structures and. The superstructure must be raised to replace bridge bearings. After watching this video, apko ratta maarne ki zaroorat bilkul nahi padengi. Today we will learn about bearing and types of bearings. Bridge standard details xs are developed and maintained by the division of engineering services des technical organization.
Department of transportation federal highway administration by the center for transportation research. The sheets contain preengineered details for a variety of structural systems, such as earth retaining systems, bridge railings and underground structures. Since revisions or additions to the design file drawings may occur at any time, the receiver agrees to indemnify, defend and hold. Although many different types of bridge bearings have been used by the nysdot, elastomeric and multirotational bearings are the. Please direct any questions on the content of this document to the bridge design section director, bridge division, texas department of transportation. These include ball bearings, roller bearings, ball thrust bearings, roller thrust bearings and tapered roller thrust bearings. There are many types of bearings, each used for different purposes.
Bearing used in the construction of bridge structure is divided into two major categories namely expansion bearings and fixed bearings. Bearings, are antifriction devices, each having different antifriction characteristics. An arkadium staple play this classic game of bridge now for free online. Team up with a computerized partner and pit your bridge skills against two clever ai opponents in this free version of the classic card game. 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. 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. Steel bridge bearing design and detailing guidelines section 1 elastomeric bearings 1. Pot bearings for bridges and structures dec 2012 bearing technologies.
The average bearing pressure on the concrete is 20mpa. A support with a f will have a bearing device that will resist longitudinal movements. The most common bearing application is the ball bearing. In addition, we will feature one particular type the tapered roller bearing. The housings are as compact as possible without sacrificing their brawny ruggedness. Pin bearing a pin bearing is a type of fixed bearings that accommodates rotations through the use of a. Post tensioned psc box girder bridge using balanced cantilever method. Computational analyses of quasiisolated bridges with fusing.
Pdf a bearing is a machine element which supports another moving machine element known as journal. Of all the bearings mentioned, the reinforced elastomeric bearing introduced in 1955 has been. Receiver agrees that wsdot cannot be held responsible for problems arising from files which have been converted. Bearing types ccl designs bespoke bearings to exacting standards. Three major types of bridge bearings are presented.
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. Anulab pot cum ptfe bridge bearing 260 mt rotation test as per irc 83 part iii. Fhwa bridge inspection manual section 9 bridge bearings. Use l type abutments with expansion joints at the bridge ends where bridge length exceeds these values. Bearing types and application design ball bearings roller. Bearings identitging and correcting causes of bearing faihue. A bearing is a machine element that constrains relative motion to only the desired motion, and reduces friction between moving parts. Elastomeric, pot and spherical bearings can be fixed, guided or free depending on design requirements. Steel bridge bearing design and detailing guidelines introduction the purpose of this guide is to present steel bridge bearing details that are cost effective, functional, and durable. Wisdot bridge manual chapter 27 bearings july 2019 273 27. The bearings with which we are concerned fit two basic categories ball and roller. References shown following section titles are to the aashto lrfd bridge design specifications lrfd section 11 discusses the design requirements for bents, piers, and abutments. 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.
1368 433 1442 981 1090 959 1329 876 741 1418 1500 379 1565 807 700 1407 717 95 557 1351 212 337 1348 893 1453 1211 150 481 616 658 1176 1012 221