Unfortunately, this book cant be printed from the openbook. Steel bridge bearing design and detailing guidelines section 1 elastomeric bearings 1. The separator, which retains the balls or rollers, is also called the cage. A bridge bearing is a component of a bridge which typically provides a resting surface between bridge piers and the bridge deck. If you need to print pages from this book, we recommend downloading it as a pdf. Thrust bearings corporate offices 308 springhill farm road fort mill, south carolina 29715 telephone 8035488500 fax 8035488599 distributor customer service toll free 8005236572 fax 8035488594 linear customer service toll free 8004623399 fax 2157819830 this product section has been excerpted from our full. Bridge bearings are structural equipment or devices installed between bridge. The following case studies show three recent bridge bearing replacement projects designed by wsdot. Select the images you want to print all of the images in the folder you selected in the sidebar. The same principles apply to all types of structure where forces are exerted. Tell a friend about us, add a link to this page, or visit the webmasters page for free fun. Steel bridge bearings may be divided into three general types.
Pin bearing a pin bearing is a type of fixed bearings that accommodates rotations through the use of a steel. The purpose of a bearing is to allow controlled movement and thereby reduce the stresses involved. 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. Tp sq hole ctrs hole ctrs hole dia height mass reference no. Click on a datetime to view the file as it appeared at that time. The rolling elements distinguish the two basic bearing types ball bearings and roller bearings. Bridge bearing article about bridge bearing by the free dictionary. 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. Trbs second strategic highway research program shrp 2 report s2r19arw2. You should see your images appear in the content section of the bridge window once the folder is selected. This website and documents are provided for use by persons outside of the kansas department of transportation as information only.
Bridge bearings types of bearings for bridge structures. Rocker and pin bearings for bridge structures rocker is an expansion bearing composed of curved surface at the bottom, which accommodate translational movement and a pin at the top makes room for rotation. Ccls quality management system complies with en iso 9001. The maximum horizontal load can only be applied if it is less than 33% of the simultaneous vertical load. Lrfd steel girder superstructure design example bearing design example design step 6 table of contents design step 6. Pin bearing is a fixed bearing that make room for rotation movement through the application of steel pin. What is preset during installation of bridge bearings. 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. Lrfd steel girder superstructure design example lrfd. Designers need a selection of bearing types to handle varying demands. Bearings in this catalog are arranged by bearing type, with a size andor numerical listing.
Function of bearing pads in bridge construction duration. Ccl advanced solutions help create innovative bearings that anticipate. The primary function of elastomeric bearing pads is to provide a connection to control the interactions of loading and movements between parts of a structure, usually between superstructure and substructure. A bridge bearing is a superstructure element that provides an interface between the superstructure and the substructure. Wisdot bridge manual chapter 27 bearings wisconsin dot.
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 latest design software and fea is used to optimise bearing design for efficiency and cost. Create a pdf with bridge in order to print multiple images on a single page 2 2 1. Composite dry sliding bearings are primarily used for bearing arrangements where heavy loads have to be supported and where rotational or. Bridge bearings types of bearings for bridge structures and details. Warranty ntn warrants, to the original purchaser only, that the delivered product which is the subject of this sale a will conform to drawings and specifications mutually established in writing as applicable to the contract, and b. 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.
The primary purpose of using such neoprene bearings for short and medium span bridges is to reduce the cost of end bearing construction while still maintaining provision for. Bridge bearing replacement transportation research board. The resistors of bridge are replaced with combination of resistor, inductor and capacitors i. Bridge bearings until the middle of this century, the bearings used consisted of following types. Steel bridge design handbook bearing design volume 15. Ac bridges are similar to wheatstone bridge in which d. The information included is intended to permit efficient. 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. 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. The normal length of a upper bearing plate should be composed of the following components. Following publication of part 2 of this code in 1985, the text was revised and extended to cover reinforced and prestressed brickwork, and the second edition.
Kansas department of transportation bridge construction manual version 107 kdot bridge section 11. The bridge deck is fixed in one corner and horizontal movements are controlled by the use of guided unidirectional 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. In all instances, the use of intermediate expansion joints should be avoided wherever possible. 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. Delivering quality at every stage, all bridge bearings are designed individually to exacting standards using high specification materials from approved sources. Preset is a method to reduce the size of upper plates of sliding bearings in order to save the material cost. Function of bearings for bridges bridge bearings are used to transfer forces from the superstructure to the substructure, allowing the following. The support at a bridge pier carrying the weight of the bridge. Computational analyses of quasiisolated bridges with. Bearings or allows displacements in all directions free bearings.
The three primary functions of a bridge bearing are. The free encyclopedia for uk steel construction information. Formerly, the classical arrangement of the bearings for a bridge with two main gird ers consisted of one fixed and one lengthwise moveable bearing at one abutment and one lengthwise moveable and one free bearing at the other abutment fig. The first edition of this book was published in 1981 as load bearing brickwork design, and dealt with the design of unreinforced structural brickwork in accordance with bs 5628. Bridge bearing article about bridge bearing by the free.
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. The required passage may be for a road, a railway, pedestrians, a canal or a pipeline. Bridge vibrations as influenced by elastomeric bearings. Bearing is the component of bridge on which the girder in case of girder bridge, or solid slabin case of slab bridge rests. Modern bridge bearings and expansion joints for road.
The new steel bridge design handbook is divided into several topics and design examples as follows. Fhwa bridge inspection manual section 9 bridge bearings. Interchange metric plain bearings,du composite slide bearing, sf1 bushing,sf1 bush beairng,dp4 bushing. In a tapered roller bearing, the center lines do not converge at a common point. The following table provides guidance regarding maximum bridge superstructure. 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. However, bridge bearings could create more problems for the bridge structure than it solves if not properly understood, especially. 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. Full text of structural bearings and expansion joints for.
However, the span restriction for sliding bearing utilization can be disregarded when it is used in combination with other bearing types. A free multidirectional bearing is provided for the diagonally opposite corner to the fixed bearing. Bridge bearings are used to transfer forces from the superstructure to the substructure, allowing the following types of movements of the superstructure. Bearings transfers loads from super structure to sub struc.
Each bearing listing includes the appropriate dimensions. Similar to rocker and roller bearings, two types of plate bearings are used, viz. Design of masonry structures, third edition of load. Bearings catalogs and cad drawings services nsk global. Bridge bearings indian association of structural engineers. Bearings gives the supporting conditions to super structure. 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. Bridge bearings function of bearings bridge bearings are used to transfer forces from. This is the culmination of seven years of effort beginning in 2005. Bridge decks supported by piers are susceptible to damage due to vehicle movement and heat expansion.
1021 596 577 576 827 265 767 1123 1135 1485 305 1418 1111 550 739 342 418 1056 1233 932 1104 735 296 780 1183 1265 881 1063 85 125 369 1465 652 277 1131