Bridge flexibility can be properly maintained by a constituent known as bridge elastomeric bearing pad. Structures design and analysis programs new york state. What is an elastomeric bearing pad and its role in bridge design. Ccl quality delivering quality at every stage, all bridge bearings are designed individually to exacting standards using high specification materials from approved sources. Rotation trelleborg bearings are manufactured from natural rubber compounds chloroprene rubber compounds also available to meet a wide range of international standards and design guides including, as, bs, astm, aashto, naasra. Installpier tops install pier tops horizontal at the correct elevation with a plus or minus tolerance of zero. Mechanical properties of elastomeric pads were used in the computer model. Nepean rubber manufactures the full range of australian standard sized elastomeric bearings and custom sizes to order. This document was modified from the original design manual for inclusion of lrfd material and general content by georgia. The bearing padbridge girder interface defines support boundary conditions.
Elastomeric bearings goodco ztech elastomeric bearings are fabricated of natural rubber or neoprene. Astm d4014 specification for plain and steellaminated elastomeric bearings for bridges 1. It is usually formed with a strong and elastic material like neoprene a sort of heavyduty industrial rubber. Seismic analysis of existing structures with elastomeric bearing pads often requires a determination of the friction coefficient between the bearing pad and concrete. Steelreinforced elastomeric bearing pads are widely used to support. Pdhonline course c485 2 pdh fhwa bridge inspection manual section 9 bridge bearings 2012 instructor. The range includes, isolation bearings, bearing pads and strips. Lrfd steel girder superstructure design example lrfd. Round pads diameter mm available thickness mm load range kn 240 35. A complete range of bridge bearings for public works and civil engineering. Elastomeric bridge bearings transportation research board. Evaluation of rotational stiffness of elastomeric bearing padanchor bolt connections on deep foundation bents article pdf available in journal of bridge engineering 146.
The most commonly used bearings in bridges, steellaminated elastomeric bearings, are preferred due to their versatility and lack of required maintenance. Our elastomeric bearings pads are manufactured with the highestquality neoprene. Elastomeric bearing pads brp elastomeric bearings pads are designed for use in bridge and building construction. Scougal rubber steel reinforced elastomeric bearing pads. These pads are manufactured from alternating layers of neoprene or natural rubber and steel sheets and are molded under heat and pressure vulcanization process into one unit. Structural analysis program, computers and structures inc. Method a is the required design procedure for plain. Lrfd steel girder superstructure design example bearing design example design step 6 table of contents.
Elastomeric bearing pads under combined loading fdot. And the reinforced elastomeric also can be divided into laminated bearing pad and ptfe sliding elastomeric bearing. Plain pads, steel reinforced and cotton duck elastomeric. Erection place bearings at their proper locations before erecting the superstructure supported by the bearni gs. The typical hinge or abutment configuration using many small elastomeric bearing pads has proved highly reliable and redundant. Elastomeric bridge bearings, free elastomeric bridge bearings software downloads, page 3. Reinforced elastomeric bearing pads, designed in accordance with. Installation elastomeric bearings pads based on aashto, bsc and din regulations a. The steel plates are fully embedded in the elastomer so that they are protected against corrosion. Elastomeric bridge bearing elastomeric bridge bearing. Steel bridge design handbook bearing design volume 15. Brp elastomeric bearings pads are designed for use in bridge and building construction. Installation elastomeric bearings pads based on aashto. Voss engineering structural pads and slide bearings.
Our laboratory is nata registered to perform the appropriate physical tests. 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. Steel plates are bonded to the rubber through a vulcanization process and have the main scope to increase the resistance of the bearings to vertical loads. They are tested for compliance to the required standard and certificates are provided. Bridge design specifications, section 14, should be considered the preferred type of bearing for all structures. D, pe retired pdh online pdh center 5272 meadow estates drive. Introduction elastomeric bearings introduced nearly 60 years ago, laminated steel elastomer bearing pads are now in service in tens of thousands of bridges and similar structures throughout the world. If the bearings are pot bearings are they fixed or sliding bearings. Elastomeric bridge bearing elastomeric bridge bearing pads. Lcls elastomeric bearings have been designed to be very easy to install, maintenancefree and costeffective. The laminated bearing can withstand higher compressive, shear forces and. During this working meeting, the project work plan is discussed, changes made, and shortly thereafter balloted for adoption.
It is usually formed with a strong and elastic material like. Depending on the area of application and country requirements maurer elastomeric bearings can be supplied in accordance with various standards, e. As we have seen, designing elastomeric bearing pads using simulation software play a crucial role in bridge safety, dependability, and longevity. This example follows aashto lrfd 7th edition section 14. Our elastomeric bearings pads are manufactured with the highestquality neoprene for applications in highway construction. Elastomeric bridge bearings have generally performed satisfactorily under current. We are one of the eminent manufacturers and suppliers of elastomeric bridge bearing pads. With extensive experience in bridge engineering, freyssinet is able to provide a onestopshop for the design, manufacture and installation of bridge bearings, from assessment and temporary works design through to supply and installation. Rubber bearing pads dampen vibration and permit for the natural thermal expansion and contraction of structures, whether precast concrete or steel, which aids in prolonging their lifespan. Elastomeric bridge bearings have generally performed satisfactorily under current aashto and state dot materialstest methods and requirements. According to the structure of elastomeric bearing, it can be divided into reinforced elastomeric bearing and nonreinforced elastomeric bearing. Lrfd design manual georgia department of transportation.
Longman industrial sales is best manufacturer and supplier of premium quality natural rubber elastomeric neoprene bearing pads or bridge bearing pads or laminated elastomeric bearings in pakistan. Goodco ztech elastomeric bearings are fabricated of natural rubber or neoprene. The material in this report will be of immediate interest to bridge designers and materials engineers. The product has been successfully used in a broad range of applications which include. Steel bridge bearing design and detailing guidelines section 1 elastomeric bearings 1. Elastomeric bridge bearing 100x100x40mm elastomeric bridge. Elastomeric bearing pad bridge construction bridge design.
Hydrocarbon fire performance of reinforced elastomeric bridge. Ccls quality management system complies with en iso 9001. Cotton duck bearing pads cdp are sometimes used to support loads and accommodate movements and rotations at bridge 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. Elastomeric bearing, also called elastomeric bearing pad, is one type of bridge bearings. Maurer elastomeric bearings are available made of natural or chloroprene rubber from inhouse production and mixture. Design step 6 design of bearings prestressed concrete.
The original bridge and structures design manual was created through the publicprivate partnership of the georgia department of transportation and the consulting engineering companies of georgia. Prestressed concrete slab bridges tend to have many plain pads along the width of the bridge and concrete girder bridges tend to have larger, laminated bearings. Which is the best bridge design software for a beginner and which. In addition to the stiffnesses, estimates of stress and deformation levels in the bearings are obtained. Our bearing pads perform crucial role in bridge safety, dependability, and longevity. The bearings may be designed by either method a article 14. A wide variety of elastomeric bridge bearings options are available to you, such as single row. Pot bearings are often regarded as suitable for use when bridge bearing rotations are too large. Flowcharts for the bearing design using both method a and method b are included in section 3.
A range of hardnesss are available from sdh 50 to sdh 70 to suit special applications. Designed and sized to meet the needs of your structure, these bearings are rigid enough to transmit the necessary loads and flexible enough to permit the rotation and movement required by the structure. Evaluation of rotational stiffness of elastomeric bearing. Elastomeric bridge bearing pads ebb the ntpep technical committee responsible for authoring the project work plan convenes annually at the ntpep national meeting. Anulab bridge bearing testing ultimate compressive. Although this program has been subjected to many tests all with satisfactory results no warranty, expressed or implied is made by the new york state department of transportation as to the accuracy and functioning of the program, nor shall the fact of distribution constitute any such warranty, and no responsibility is assumed by. Features extended durability excellent flexibility under lateral load easy to install. Most of the above information is typically obtained from the superstructure design software output, which is the case for this bearing design first trial of girder design. The latest design software and fea is used to optimise bearing design for efficiency and cost. An elastomeric bridge bearing is a commonly used modern bridge bearing. Steel bridge bearings may be divided into three general types. Lrfd steel girder superstructure design example bearing design example design step 6 table of contents design step 6. The information included is intended to permit efficient fabrication, installation, and maintenance of these bearings.
For example is it a bridge constructed from prestressed beams or is it a segmental or cip box section. Determination of bearing type effect on elastomeric. Aashto m251 plain and laminated elastomeric bridge bearings b. Fhwa bridge inspection manual section 9 bridge bearings. These are manufactured using best quality material which we procured from the leading. Delivering quality at every stage, all bridge bearings are designed individually to exacting standards using high specification materials from approved sources. Our history of supplying bearing pads dates back to 1965 whenever structural rubber products supplied the very first bearing pad for use in an illinois department of transportation project. Design guidelines for elastomeric bearings elastomeric bearings shall consist of either plain elastomeric pads or steelreinforced laminated pads. Elastomeric bridge bearings software free download.
Elastomeric bridge bearings, bearing pads, neoprene. Warco biltrite manufactures a full line of elastomeric bearing pads for bridge, building and reservoir construction markets. Laminated elastomeric bearings support simultaneous loads and deformation in any direction. They support vertical loads with minimal compression, allow expansion and contraction of. The following sections and the design example below are based on method b. Cdp are preformed elastomeric pads consisting of thin layers of elastomer interlaid with fabric, and they are manufactured under military specifications with limited guidance from the aashto. For steelreinforced elastomeric bearings, the following. Trelleborg elastomeric bearings are designed to accommodate three types of movement. I assume it is a box section and that due to the high load the bearings are not elastomeric pads but pot bearings. Please contact us for more information and for bearing pad pricing. Rubber bearing pads dampen vibration and permit for the natural thermal expansion and contraction of structures, whether precast concrete or steel, which aids in prolonging.
There are several different similar types of bridge bearings that include neoprene bearing pads, neoprene bridge bearings, laminated elastomeric bearings and seismic isolators. We continually strive to supply quality bearing pads for a wide variety of projects. The designer must determine which bearing type is best suited to cost effectively accommodate the design. The procedure is applicable to plain as well as steelreinforced pads, flat or tapered. How to model the elastomeric bearing in the superstructure of bridge. We are also approved by the research, design and standards organization rdso to manufacture and supply our bearings for all.
These are all normally referred to as bridge bearing pads in the construction industry. Elastomeric bearings pads are commonly used under precast concrete beams, steel beams and in various other support points. Recommended specifications for elastomeric bridge bearings, accom panied by a. In addition, we offer these elastomeric bridge bearings at reasonable prices. Reinforced elastomeric bearings are an often used type of bridge bearings and already been installed in many kinds of structures all over the world. Pot bearings are special types of bearing pads for taking larger loads, translation and rotation in confined areas. Elastomeric bearings can be either single elastomeric pads or multiple pads laminated with steel shims. Rotation may occur on any axis and is accommodated by deformation of the elastomeric pad. There are several different similar types of bridge bearings that include neoprene bearing pads, neoprene bridge bearings, laminated elastomeric bearings and seismic isolators, which are all generally referred to as bridge bearing pads in the construction industry.
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