Types of bridge bearing pdf free

A bearing is a machine element that constrains relative motion to only the desired motion, and reduces friction between moving parts. Spherical bearing, also called spherical bridge bearing, is one type of bridge bearings with large rotation capacity. Suitability this type of bridge bearings is suitable for a long span 20m long of the girder bridge. An elastomeric bridge bearing is a commonly used modern bridge bearing. Trbs second strategic highway research program shrp 2 report s2r19arw2. Steel bridge design handbook bearing design volume 15. Bearing used in the construction of bridge structure is divided into two major categories namely expansion bearings and fixed bearings. A common form of modern bridge bearing is the elastomeric bridge bearing. Bridge bearings 2 types of bearings for a girder bridge. Pot bearings for bridges and structures plain bearing products.

Bridge bearings are devices for transferring loads and movements from the deck to the substructure and foundations. Wisdot bridge manual chapter 27 bearings july 2019 273 27. The construction layout sheet in the plans will show the designers intent. It is proposed the student to achieve, test and comment on different means of holding the deck. Steel bridge bearings may be divided into three general types. Bearing types ccl designs bespoke bearings to exacting standards. May 07, 2009 an ebook reader can be a software application for use on a computer such as microsofts free reader application, or a booksized computer that is used solely as a. In highway bridge bearings movements are accommodated by the basic mechanisms of internal deformation elastomeric, sliding ptfe, or rolling. 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. The former permits both translational and rotational movements whereas the latter allow rotational and limited translational movements. All bearings do, however, have at least the bearing or bearing surface. Bearings or allows displacements in all directions free bearings.

Function of bearings for bridges bridge bearings are used to transfer forces from the superstructure to the substructure, allowing the following. Various types of bearings have been offered to take advantage of ptfes. Different types of bridges bridge and its components. A wide variety of bridge bearing types options are available to you, such as aisi, gb. 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. Types of elastomeric bearing pads construction rubber. Bridge bearings indian association of structural engineers. The obstacle to be crossed may be a river, a road, railway or a valley. There are several types of bridge bearings which have been employed in. Bridge geometry manual free pdf cb0220 a bridge geometry manual has been developed as a resource for bridge engineers and cad technicians. Elastomeric bearings for construction industry in neoprene and natural rubber compound laminated rubber bearings provide the simplest method of isolation and are most suitable for high frequency ground motions. 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. 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. 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.

Bridge bearings types of bearings for bridge structures and details. Fhwa bridge inspection manual section 9 bridge bearings. Anulab pot cum ptfe bridge bearing 260 mt rotation test as per irc 83. Bridge bearings types of bearings for bridge structures. 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. 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 design bridge design and assessment bridge bearings. Wisdot bridge manual chapter 27 bearings wisconsin dot. A large variety of bearings have evolved using various combinations of these mechanisms. Bearing is the component of bridge on which the girder in case of girder bridge, or solid slabin case of slab bridge rests.

Pdf a bearing is a machine element which supports another moving machine element known as journal. The required passage may be for a road, a railway, pedestrians, a canal or a pipeline. The bridge designer will prohibit movement in some bearings and allow movement in others. Construction of railway bridge ll basic construction of. We have been focusing on research and development in recent years and we have made great achievement in this industry. Information on bridge bearings is available in various technical literatures but it is scattered. In general, there are two types of supports shown on plans, fixed f or expansion e. Types btu and btf bolt holes in the top and base plates are provided to assist the. In the course of the past two centuries bridge bearings evolved as parts of. Bearings gives the supporting conditions to super structure.

Bridge bearings types of bearings for bridge structures and. In this type of bridge bearing, the rocker pin is eliminated by casting the top of the bottom shoe in the shape of a hemisphere to function as a rocker pin. Azlan abdul rahman faculty of civil engineering, utm. The concept of a bearing to lessen friction between an object and the surface over. 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. A wide variety of types of bridge bearings options are available to you, such as single row. With high strengthened steel body, spherical bearing is especially designed for high vertical, horizontal and. Bridge bearings are used to transfer forces from the superstructure to the substructure, allowing the following types of movements of the superstructure. Section 2 special design requirements for different bearing types. 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. 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.

The bearings may be maintenance free if they are kept free from dirt and abrasive dusts. Similar with pot bearing, spherical bearing also can be divided into three types. 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. Apr 23, 2015 bridge bearings until the middle of this century, the bearings used consisted of following types. Fhwa bridge inspection manual section 9 bridge bearings 2012 instructor. The rolling elements and both races slant inward, much like a cone. This module provides practical information for efficient bearing design and. The oldest form of bridge bearing is simply two plates resting on top of each other. 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. Although free bearings require no provision for the transfer of horizontal forces to the structure other than by the friction, it is prudent to use fixing bolts as means of ensuring correct location and bearings are provided with bolt holes for this purpose. In nine chapters, the manual presents the basics of roadway geometry and many of the calculations required to define the geometry and associated dimensions of bridges. A try different ways to support the deck of the test bed using the information provided. This iricen publication is a result of the desire to fill the gap. There are several types of mechanical bridge bearing, such as the pinned bearing, which in turn includes specific types.