Type of bridge bearing pdf download

Bridges are classified into so many types based on different criterias. Bridge bearings play a very important role in keeping the bridge structure in good health. Apr 23, 2015 bridge bearings until the middle of this century, the bearings used consisted of following types. The element defines only those bridge bearings that are enclosed so they are not open for detailed inspection. Report steel bridge bearing design and detailing guidelines aashto please fill this form, we will try. Computational analyses of quasiisolated bridges with fusing. Rathi2 1professor 2student 1,2department of applied mechanics 1,2l. Bridge bearings introduction aashto defines a bearing as a structural device that transmits loads while facilitating translation andor rotation.

Free 3d cad models for bearings bearing cad downloads ast. Another type of bearing consists of oilsoaked felt or tar paper that has been dusted with graphite. Multirotational bearings consist of a confined elastomeric element pot design or an unconfined polyether urethane disc disc. Bridge bearings indian association of structural engineers. A drawing showing the bearing layout should include the following. Bridge bearing devices are classifi ed as fixed or expansion. Description download steel bridge bearing design and detailing guidelines aashto comments.

Trelleborg designs and manufactures elastomeric bridge bearings in accordance with this standard. Seismic design of baseisolated highway bridges utilizing leadrubber bearing. The oldest form of bridge bearing is simply two plates resting on top of each other. May 24, 2014 make vacuum preloaded spherical air bearings without special tools duration. For comparison purpose of moments and reinforcements of both type bridge, the load cases for integral bridges are taken similar as bearing bridges, i. Bridge bearings are used to transfer forces from the superstructure to the substructure, allowing the following types of movements of the superstructure. The obstacle to be crossed may be a river, a road, railway or a valley. Reinforced elastomeric bearing pads, designed in accordance with bridge design. Spherical bearing spherical bearing, with fixed, guided and free sliding type is suitable for more complex bridges in low temperature regions.

Since 2005 the european standard en 373 has applied to elastomeric bearings for architectural and civilengineering applications. Specifications, section 14, should be considered the preferred type. Any of the mechanical bearings can be converted to an uplift type. Kansas department of transportation bridge construction manual version 107 kdot bridge section 10. Besides the functional requirements, the standard describes the design rules, the material properties, the production tolerances and the acceptance tests. In situations where the bridge skew exceeds 30 degrees, consult the bearing and expansion joint. The most frequently used type of bearing for highway bridges is the proprietary pot bearing, which is able to accommodate rotation and. Nskhps high performance standard bearings for industrial machinery. Pdf support bearings used in road bridges frequently account for a major part of the. In addition to the single row design, there also are double row, angular contact and ball thrust bearings. Fhwa bridge inspection manual section 9 bridge bearings. The characteristics and uses of each type will be covered in chapter five. A roving bridge, changeline bridge or turnover bridge is a bridg e over a canal constructed to allow a horse towing a boat to cross the canal wh en the towpath changes sides. Design example 3 colorado department of transportation.

Pot bearing, made of elastomeric pad embedded into the steel plate is divided into fixed bearing, guided bearing and free pot bearing. Pdf seismic design of baseisolated highway bridges. The proportion of horizontal to vertical load is increasing due to the current trend toward continuous, joint. Since serious damage may result from an improper jacking operation, it is extremely important that this operation is correctly planned and accomplished. Moments and reinforcement are considered for only sagging case. Bridge bearings types of bearings for bridge structures and details. The elastomeric bearings of type 1 and 2 are set between steel plates. Bridge bearings support structures at a constant elevation, carrying forces from the superstructure into the substructure and allowing necessary superstructure motions to take place. The hard work of the national steel bridge alliance nsba and prime consultant, hdr engineering and their subconsultants in producing this handbook is gratefully acknowledged. The maximum horizontal load can only be applied if it is less than 33% of the simultaneous vertical load. Generally, the terminology used in en 37 is adopted in the table although not all types of bearing are covered by en 37.

The sheets contain preengineered details for a variety of structural systems, such as earth retaining systems, bridge railings and underground structures. The maximum allowable compressive stress on the bearing is a function of the shear modulus. These bearings may have a rectangular, square or circular section. Comparative study of behaviour of integral and bearing. The hinged bearing is composed of one curved top plate over a flat bottom plate with a pin at the centre which allow rotation but prevent translation. Bridge bearingimportance,different type and mechanism.

General expansion joints accommodate the expansion and contraction of bridges due to temperature variations. Although many different types of bridge bearings have been used by the nysdot, elastomeric and multirotational bearings are the. Pdf steel bridge bearing design and detailing guidelines. Different types of bridges bridge and its components. Roller bearing one variation of roller bearings the tapered roller is used.

The leadrubber hysteretic bearing is a laminated elastomeric bearing of the type used. Wisdot bridge manual chapter 27 bearings july 2019 273 27. Another type of bridge bearing is the mechanical bridge bearing. In general, there are two types of supports shown on plans, fixed f or expansion e. With the advent of new technology, rcc and psc bridges along with elastomeric and ptfe bearings are gradually replacing steel bridges and conventional bearings. When the direction of the load is parallel to the shaft. July 2019 276 the required design input for the design of an elastomeric bearing at the service limit state is dead load, live load plus dynamic load allowance, minimum vertical force due to permanent load, and design translation. Ball bearings subcategories roller bearings 7 subcategories updated. This includes pot bearings but does not hidden elastomeric or other type of bearings ea of bearing for each of the condition states, report the estimated quantity in each. Bearings catalogs and cad drawings services nsk global. It has similar structure and component like rocker bearing apart from the bottom of pin bearing which is flat and fixed to the concrete pier, as can be observed in figure4. Comparative study of bearing and integral type bridges as per.

Depending on the area of application and country requirements maurer elastomeric bearings can be supplied in accordance with various standards, e. Reinforced elastomeric bearings are an often used type of bridge bearings and already been installed in many kinds of structures all over the world. The designer must determine which bearing type is best suited to cost effectively accommodate the design requirements. Ccl advanced solutions help create innovative bearings that anticipate. So it has to bear all the load coming on the superstructure of the bridge and has to transmit it to the sub structure i. Pdf modern bridge bearings and expansion joints for road bridges. Pdf management system for road bridge structural bearings. Grease replenishing system for highspeed spindles finelub ii. The new steel bridge design handbook is divided into several topics and design examples as follows. Astm d4014 032018 standard specification for plain and. Figure7 show details of elastomeric bearing and its application in bridge structure. 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. They support vertical loads with minimal compression, allow expansion and contraction of. A complete description of all types is beyond the scope of this text.

Tp sq hole ctrs hole ctrs hole dia height mass reference no. The required passage may be for a road, a railway, pedestrians, a canal or a pipeline. This module provides practical information for efficient bearing design and. Feb 18, 2016 bridge engineering in hindi 001 analysis and design of bridges civil engineering lectures btech duration. Dowell moxon, a shipowner and merchant from liverpool, received a patent regarding the improvement in the construction of bridges and similar building types. 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. Several layers are placed on the bridge seat with the superstructure placed directly on it. When a bridge is constructed by incremental launching or whenever heavy and large structural elements have to be moved, the uptodate sliding bearings can be foreseen to enable the horizontal transport. Design manual for roads and bridges part 1 bd 2092 addendum december 2000 1 nra addendum to. Select a feasible bearing type plain or laminated steel reinforced. Types of bearing table 1 shows the main types of bearing that are used in steel bridges. Trbs second strategic highway research program shrp 2 report s2r19arw2.

Several layers are placed on the bridge seat with the superstructure. December 2, 2015 reduced type iii bearing load capacity. Bridge bearings types of bearings for bridge structures and. Behavior of bearing plate type bridge bearings under. Elastomeric bearings are used for vertical loads generally less than. 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. Each range is therefore broken down into three types of bearing. A common form of modern bridge bearing is the elastomeric bridge bearing. At this time coefficients of static and kinetic friction. Elastomeric bearing is neither expensive nor requires considerable maintenance, that is why it the most desired bearing type. Major product categories in this bearing cad drawing library include.

Pot bearings fixed type btf 8 holes for g dia bolts type btf r6 5 the average bearing pressure on the concrete is 20 mpa. Modern bridge bearings and expansion joints for road bridges. Super precision sealed angular contact ball bearings. A bridge is structure which allows passage over an obstruction.

College of engineering, ahmedabad 380015 abstractas temperature changes daily and seasonally, the spans of integral bridge increase and decrease, pushing the. Fixe d devices are called bolsters and only allow rotation at that support location. It consists of two curved plate that match each other as shown in. Steel bridge design handbook bearing design volume 15.

As a result of adopting the aashto provisions of 14. Covers design and performance of most common types of bridge bearings, but does not cover concrete hinges and special bearings for moving bridges. Wisdot policy is for all elastomeric bearings to meet zone d requirements. The obstructions may be river, valley, rail route or road way etc. Modern bridge bearings and expansion joints for road. Steel bridges use l type abutments with expansion joints at the ends for multiplespan bridges.

When the direction of the load weight being moved is at right angles to the shaft, it is called a radial load. The goodco ztech cn type bearing is a selflubricating spherical bearing consisting of bronzetosteel rotational and horizontal movement surfaces. A support with a f will have a bearing device that will resist longitudinal movements. Types of bridges based on span, materials, structures. The latest design software and fea is used to optimise bearing design for efficiency and cost. Inspection and evaluation of bridge bearings topic 9. There are several types of mechanical bridge bearing, such as the pinned bearing, which in turn includes specific types. There are various types of bridges classified based on span, materials, types of bridge structures, functions, utility and position etc.

Modern bridge bearings and expansion joints for road bridges andrzej niemierko a, aroad and bridge research institute, instytutowa 1, 03302 warsaw, poland abstract introduced in 2010 en 37 structural bearings is nowadays a basic act intention of which is providing a good manufacturing quality and operation of modern bridge bearings. Standard bearings bearings are individually moulded and the reinforcing plates are completely buried in the elastomer with at least 4mm lateral cover and generally 2. Bearings are elements transferring vertical loads from. The designers of bridges must assure themselves that bridge bearings can transmit the high horizontal loads of current designs. Specifies requirements for rubber materials used in elastomeric bridge bearings, which may be of the plainpad or laminated type. Delivering quality at every stage, all bridge bearings are designed individually to exacting standards using high specification materials from approved sources. Bridge bearing replacement transportation research board. Bridge bearings until the middle of this century, the bearings used consisted of following types. Bridge standard details are not standard plans and are subject. May 20, 2019 a civil engineers blog bridge engineering. 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. Steel bridge bearing design and detailing guidelines section 1 elastomeric bearings 1. These include rockers, rollers, pins, pots, steel girder hangers, ptfeelastomeric, and elastomeric pads. Applications goodco ztech spherical bearings can be used for bridges, railway and highway overpasses or buildings where design or installation requires high rotational capacity.

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. Bridge bearings trelleborg marine and infrastructure. Modern elastomeric bearings of over 10 mn capacity on bridge figures available via. References to material in 2011 design manual have been highlighted in blue throughout. Similar to rocker and roller bearings, two types of plate bearings are used, viz. This is a simple but effective bearing that is commonly used on short span concrete slabs and girders that sit on concrete abutments. Bearings are made to order to conform to all relevant local and international regulations and standards. Steel bridge bearings may be divided into three general types. Therefore, different static and kinetic forces may be expected at each substructure depending on the carried axial load and bearing type. Comparative study of behaviour of integral and bearing type bridge under temperature loading b.

Semiintegral construction may be used in lieu of expansion joints for single span bridges under 300 feet with the approval of the bridge design engineer. Ball bearing the most popular type of ball bearing has a single row of balls. Multirotational bearings are generally used in high load situations, or where the thermal movements are excessive for elastomeric bearings. Introduction elastomeric bearings introduced nearly 60 years ago, laminated steelelastomer bearing pads are now in service in tens of thousands of bridges and similar structures throughout the world. This bearing is to be used with steel girder and prestressed nebt and ibeam superstructures.

A bearing is a machine element that constrains relative motion to only the desired motion, and reduces friction between moving parts. The superstructure must be raised to replace bridge bearings. Pin bearing is a fixed bearing that make room for rotation movement through the application of steel pin. Bridge standard details xs are developed and maintained by the division of engineering services des technical organization. Example 3 type i bearing steel reinforced method b 1 218 design example 3 appendix a example 3 type i bearing steel reinforced method b general information material and section properties bearing dimensions bearing width w 20. During conventional bridge construction, bridge bearings are set during the erection of beam elements. The same principles apply to all types of structure where forces are exerted. Bearing in bridge is simply a device which bear the superstructure. Individual stepbystep instructions for mounting selfaligning ball bearings, spherical roller bearings, and cb this expansion ill allo the boo to be. The designer must determine which bearing type is best suited to cost. Also specifies methods of test and describes procedures for the preparation of test pieces from finished bearings. 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 and stability journal of structural. The construction layout sheet in the plans will show the designers intent. Behavior of bearing plate type bridge bearings under traveling load toshihiko naganuma and koretada seki, hanshin expressway public corporation, japan masanori iwasaki and koichi tokuda, yokogawa bridge corporation, japan although bridge bearings are important parts in bridges, they are subject to severe conditions for long periods of time. Bearing is the component of bridge on which the girder in case of girder bridge, or solid slabin case of slab bridge rests. Till 2010 this task was fulfilled by approval tests being base for technical approvals issued. The information included is intended to permit efficient fabrication, installation, and maintenance of these bearings. Maurer elastomeric bearings can be fitted with additional steel plates and restraints. The bridge designer will prohibit movement in some bearings and allow movement in others.