3 edition of Low temperature behavior and acceptance criteria for elastomeric bridge bearings found in the catalog.
Low temperature behavior and acceptance criteria for elastomeric bridge bearings
C. W. Roeder
1989 by Transportation Research Board, National Research Council in Washington, D.C .
Written in English
|Statement||C.W. Roeder, J.F. Stanton, and T. Feller.|
|Series||Report / National Cooperative Highway Research Program,, 325, Report (National Cooperative Highway Research Program) ;, 325.|
|Contributions||Stanton, J. F., Feller, T., Association of State Highway and Transportation Officials., United States. Federal Highway Administration.|
|LC Classifications||TE7 .N25 no. 325, TG326 .N25 no. 325|
|The Physical Object|
|Pagination||69 p. :|
|Number of Pages||69|
|LC Control Number||90070028|
MECHANICAL PROPERTIES OF ELASTOMERIC SEISMIC ISOLATION BEARINGS FOR ANALYSIS UNDER EXTREME LOADINGS Manish Kumar1, Andrew S. Whittaker2,3 and Michael C. Constantinou2 1 Graduate student, Department of Civil Engineering, University at Buffalo, NY ([email protected]) 2 Professor, Department of Civil Engineering, University at Buffalo, NY. An elastomeric bridge bearing is a commonly used modern bridge 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.. They are designed and manufactured . PROBLEMS OF BRIDGE SUPPORTING AND EXPANSION DEVICES AND AN EXPERIMENTAL COMPARISON OF THE DYNAMIC BEHAVIOR OF RIGID AND ELASTOMERIC BEARINGS by J. H. Emanuel Assistant Professor of Civil Engineering and C. E. Ekberg, Jr. Professor and Head Department of Civil Engineering This is a reprint of a . , a reliable source for bridge bearing, neoprene bridge bearing, elastomeric bearings, ptfe teflon sliding bearings, steel pot bearing, mechanical steel bridge bearings sliding bearing ptfe Teflon pipe supports, rubber modular elastomer expansion joint, rubber gaskets is established from in United Arab Emirates Dubai UAE with ISO certification for .
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Low temperature behavior and acceptance criteria for elastomeric bridge bearings. Washington, D.C.: Transportation Research Board, National Research Council,  (OCoLC) The Phase III research included additional experimental work on the low temperature behavior of unconfined elastomeric bearings in order to assist in the development of recommended manufacturing tolerances, bearing prequalification procedures and tests, and improved design specifications.
Low-Temperature Behaviour of Elastomers - CRC Press Book This book focuses on the effect the composition of rubbers and the conditions of their processing have on low-temperature resistance. It considers the nature and development of two physical processes, glass transition and crystallization, determining low-temperature behavior of elastomers.
low temperature behavior and acceptance criteria for elastomeric bridge bearings Recent research has resulted in significant increases in the recommended load and deformation capacity of elastomeric bridge by: A p-version, two-dimensional (2D) finite-element model incorporating both material and geometric nonlinearities and a consistent frictional contact algorithm is utilized to analyze elastomeric bridge es and strains are examined and factors affecting them are discussed.
In particular, tapered bearings, used to support inclined girders, are analyzed. To consider the force and deformational demands on the full-scale bearings, a test. setup was developed that could investigate, 1) axial compression, 2) axial compression plus.
shear, and 3) axial compression, shear, and a compression gradient due to girder rotation. B Effects of axial load on elastomeric isolation bearings B Stability of elastomeric isolators: critical load tests and computations B Evaluation of low-temperature test methods for elastomeric bridge bearingsFile Size: 1MB.
In a recent study Guay and Bouaanani  complied important climatic data for evaluating the low temperature exposure for design and evaluation of elastomeric bridge bearings.
Elastomeric Bridge Bearings: Recommended Test Methods NATIONAL COOPERATIVE HIGHWAY RESEARCH NCHRP PROGRAM related speciﬁcations for elastomeric bridge bearings. The report includes recom- Low Temperature Behavior, 7 Creep and Compression Set, 9 Research Approach, 9 Experimental Phase, 9.
Grade 4 elastomer should be specified when the bridge is located in AASHTO low temperature Zone D, if Grade 3 is used in Zone D the other components of the bridge must be designed to resist times the shear force determined by Article when a low friction sliding surface is used or 4 times this shear force for a non-sliding surface File Size: 29KB.
''Low temperature behavior and acceptance criteria for elastomeric bridge bearings.'' Nat. Cooperative Hwy. Res. Program Rep.Transportation Research Board, Washington, D.C. Elastomeric. DESiGN GUiDE FOR BRiDGES FOR SERviCE LiFE Elastomeric 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.
42 Low temperature behavior and acceptance criteria for elastomeric bridge bearings: NCHRP report Roeder, Stanton, and Feller write about ways low temper atures stiffen elastomeric bearings. Use of the computational procedure described in this report permits estimation of the shear and compressive stiffnesses of elastomeric bridge bearings.
The procedure is applicable to plain as well as steel-reinforced pads, flat or Size: 1MB. Introduction. Bearing devices are needed to allow translation and rotation of bridge girders due to temperature gradients and loadings. As mentioned in Hamzeh et al.
and Stanton and Roeder, elastomeric bearing pads and steel-reinforced elastomeric bearings (hereafter called elastomeric bearing system) are one of the most widely used bridge-support systems Cited by: 3.
national cooperative highway research program report low temperature behavior and acceptance criteria for elastomeric bridge bearings c.
roeder, j. stanton and t. feller university of washington seattle, washington research sponsored by the american association of state highway and transportation officials in cooperation.
LRFD Steel Girder SuperStructure Design Example Bearing Design Example Design Step 6 Table of Contents Design Step - Obtain Design Criteria Design Step - Select Optimum Bearing Typ Design Step - Select Preliminary Bearing Properties Design Step - Select Design Method (A or B) Design Step - Compute Shape Factor Design Step - Check.
A new hybrid composite beam (HCB) has recently been used in the construction of three bridges in Missouri, USA. HCB consists of self-consolidating concrete (SCC) that is poured into classical arch shape and tied at the ends by steel tendons.
Both the concrete and the steel are tucked inside a durable fiberglass shell, and the voids are filled with polyiso : Mohamed A. Aboelseoud, John J.
Myers. Evaluation of Plain and Laminated Elastomeric Bridge Bearing Manufacturers NTPEP Designation: EBB National Transportation Product Evaluation Program North Capitol Street N.W., Suite Washington, D.C.
File Size: KB. The function of a bridge bearing is to transfer compression/tension, shear and rotational forces in the superstructure to the substructure while still allowing free movement of the superstructure.
Elastomeric bearings provide the same function as other commonly used bearings such as roller bearings or rocker bearings but are easier to install. For bridge bearings that have a masonry plate (e.g. - new disc bearings or existing lubricated bronze plate bearings being replaced in kind), include a 1/8 inch 60 durometer plain elastomeric pad between the bridge seat and new masonry plate to provide proper load distribution.
Use of elastomeric bearings is preferred over other types of Size: KB. Rotational Limits for Elastomeric Bearings Final Report L.R. and Hamidi, R. “Nonlinear Behavior of Elastomeric Bridge Bearings: Volume I – Theory and Application”, Final Report of State of J.F., and Feller, T., () "Low Temperature Behavior and Acceptance Criteria for Elastomeric Bridge Bearings," NCHRP ReportTRB.
Bridge Bearing Types and Functional Properties 2. Possible arrangement of Bearing Layouts TECHNICAL LECTURE SERIES INDIAN ASSOCIATION OF STRUCTURAL ENGINEERS 2 3. Introduction to the New set of Limit State Codes 4.
Installation Requirements for Bearings 5. Testing and Acceptance CriteriaFile Size: 1MB. LOW TEMPERATURE BEHAVIOR AND ACCEPTANCE CRITERIA FOR ELASTOMERIC BRIDGE BEARINGS - NCHRP During this study (Roeder, Stanton et al.
) the behavior of natural rubber and neoprene steel-reinforced elastomeric bearings was investigated. The major outcome was that,File Size: 10MB.
material specification for bearings - elastomeric plain and steel laminated table of contents scope references definitions design and submission requirements materials equipment - not used production quality assurance - not used owner purchase of material appendicesFile Size: 74KB.
(ULS), with a new set of design criteria and generally more conservative stresses. b) Laminated elastomeric (LE) bearings are still specified at the serviceability limit state (SLS), but with tighter limits for shear and rotation.
c) Anchorage requirements for both pot bearings and elastomeric bearings are amended, again slightly more Size: 1MB. Third party acceptance test of elastomeric bearing pad of size xx96 mm for Stripping/Adhesion Strength Test as per IRC 83 Part 2 & MORTH Clause The specimen are bevelled at an angle of.
The elastomer for the manufacture of the bearing is furnished in four grades of low-temperature properties: Grade 0; Grade 2; Grade 3; and Grade 5.
The elastomeric compound used in the construction of a bearing shall contain only either natural rubber or. Creep behavior at low temperature was significantly different from creep at room temperature but had no significant influence on the overall performance.
It was shown that cyclic compression force and cyclic shear strain do not have significant influence on time-dependent stiffening (crystallization) of bearings. A series of elastomeric bearings were designed and fab- ricated in compliance with KS. KS presents 6 types of elastomeric bearings.
The adopted elastomeric bearings is of type B with outer steel plate of KS exhibiting a shear modulus of It is a monolithic structure ob- tained by vulcanization of the rubber pad and external steel Size: KB.
Pin grooves in laminated bearings shall be filled with a vulcanized neoprene or a silicone material capable of bonding and maintaining integrity with the pad. Materials shall consist of Polychloroprene (Neoprene) Grade 2 elastomer as shown in AASHTO Bridge Specification, Div.
I, TableTemperature Zone B and for Low Temperature Brittleness. In the Eurocode 8, for instance, the modification factor for the estimation of the UBD properties of elastomeric isolators (post elastic stiffness and force at zero cyclic displacement), due to low temperatures (between 0 °C and –30 °C), ranges between anddepending on the design low temperature and type of elastomeric by: x2 - bearing testing and acceptance criteria Abstract - (Show below) - (Hide below) Describes the material requirements for plain and laminated elastomeric bridge bearings.
Bridge bearings. General. Add the following to the first paragraph: Elastomeric bearings shall be used whenever possible. Add to the end of the seventh paragraph the following: Bearing replacement procedures shall be shown on the Plans, including jacking locations and jacking loads.
TRB's National Cooperative Highway Research Program (NCHRP) Report Rotation Limits for Elastomeric Bearings explores the elastomeric bearing design procedures suitable for adoption in the American Association of State Highway and Transportation Officials' load and resistance factor design (LRFD) bridge design specifications.
If nothing is specified in the plans then Shore A Durometer 60 low temperature grade 3 is our default. Rhode Island uses elastomeric bridge bearing pads almost exclusively. We specify AASHTO M Section Creep and Shear Bond Strength we have our own acceptance criteria.
ASTM D Annex A1. Thermal expansion in solids is normally very small - typically around one part in one hundred thousand for a one Kelvin temperature change. That means that a one metre long length of aluminium, for example, will only change size by mm when heated by 10kelvin - effectively invisible to the human eye.
4 MN m/rad 4 K 3 2 G S 1 4 n h πa 1 2 2 b = ⋅ (3) where S = a b/2h = is the “shape factor” and K ~ MPa is the bulk modulus of the follows that M would result, for a single line of ten bearings, in a tilt of MNm/(10xMNm) =File Size: KB.
Why expansion joints are used in Bridges. contraction of the length of the bridge depending on the temperature. repair 'Low temperature behavior and acceptance criteria for elastomeric. Design Step 6 – Design of Bearings Prestressed Concrete Bridge Design Example Task Order DTFHT Design Step STEEL-REINFORCED ELASTOMERIC BEARING DESIGN (S14) Design requirements (S) Movements during construction Where practicable, construction staging should be used to delay construction of Minimum low-temperature.
along with recommended testing-acceptance criteria for elastomeric bridge bearings at low temperatures. Full size elastomeric bridge bearings were tested by specifically designed test setups that operate inside a walk-in type freezer.
Tests were conducted at oC, oC and oC for a duration of 21 days. Additional tests were performed at.POT BEARINGS AND PTFE SURFACES. This digest provides a summary of the pot bearing synthesis that was performed in Phase III of NCHRP Project"Elastomeric Bearings Design, Construction, and Materials." Phase III concerned low temperature bearing behavior and prequalifications and acceptance testing.In major earthquakes, friction sliding of common laminated elastomeric bearings limits the force transmitted from the superstructure to the substructure.
Experiments were carried out to investigate the ultimate shear performance and the friction sliding response of laminated elastomeric bridge bearings. First, the hysteresis curve of the common laminated elastomeric bearings Author: Yue Li, Qian Li, Qiqi Wu.