751.11 Bearings - Engineering_Policy_Guide
751.11.1 General 7184.108.40.206 Bearing Types. Elastomeric Bearings. Elastomeric bearings are economical bearings. Typically the footprint of elastomeric bearings is rectangular or square; however, circular elastomeric bearings may be considered for skewed bridges or short span curved steel bridges with lower vertical loading, translational and rotational demands where multi Bridge Bearing - Transfer and Absorb ForcesAnd the purpose of bridge bearing is to transfer forces from the superstructure to the substructure or reduce the ground vibration to the superstructure. Generally, according to its different structures, bridge bearing can be divided into elastomeric bearing, pot bearing, spherical bearing and seismic isolation bearing. Bridge Bearing Function and DesignsGuided Elastomeric Bearing Pads. This type of special purpose bearing pad consists of top and bottom load plates with a guide to restrict the movement to the required direction. The top and bottom load plates are hot-vulcanised to the rubber. Anchor rods are also provided in the load plates for anchoring to the bridges as per BS Standards.
Bridge Bearings - Caltrans
It has been common practice to use elastomeric bearing pads, a yielding bearing, to widen structures supported on steel rocker bearings, an unyielding bearing. While this practice has worked satisfactorily on short to moderate length structures, it has created problems when thick elastomeric bearing pads have been used on structures with long spans Bridge Bearings - CaltransReinforced Elastomeric Bearing Pads. General. Reinforced elastomeric bearing pads, designed in accordance with . Bridge Design Specifications, Section 14, should be considered the preferred type of bearing for all structures. The typical hinge or abutment configuration using many small elastomeric bearing pads has proved highly reliable and the purpose of using steel plates for elastomeric bearing Chapter 11 - Structural Repairs SECTION 05 BEARING bearing. components, stainless steel plates, teflon pad, etc. 3/32 PTFE material to be bonded to top of 1/8 stainless pad and stainless steel plate. Polytetrafluoroethylene (PTFE) self lubricating pad is to be attached to the sole plate using manufacturers specific adhesive steel plate. Polytetrafluoroethylene (PTFE) self the purpose of using steel plates for elastomeric bearing Effective Coefficient of Friction of Steel Bridge Bearingsthe use of untreated, corrosive mild steels should be avoided. Chang and Cohen <> have suggested coefficients of friction of 0. 2 for steel bearing on steel, 0 .1 for steel bearing on self-lubricating bronze plate, and O. 06 for polytetrafluorethylene (PTFE) on PTFE or stainless steel.
Elastomeric Bearings Marine-and-infrastructure
Elastomeric bearings are steel plate laminated rubber bearings installed between the hull of a vessel and its modules. They are used to accommodate axial, shear and rotational movement. By doing so, they keep a vessel's modules safe from impact, damage and deformation arising from adverse sea and weather conditions. Elastomeric Industrial Product Brochure - EkspanEKSPAN Elastomeric Bearings Industrial Products Elastomeric Bearings and Strip Laminated elastomeric bearings consist of natural rubber layers separated by steel plates. Around this makeup a rubber cover encapsulates the bearing (Fig. 1). These items are then vulcanised to create a compact maintenance free bearing. Example 3 - Type I Bearing (Steel Reinforced) (Method B)Interior Elastomeric Thickness hri = 0.500 in Steel Plate Thickness hs = 0.125 in No. of Steel Shim Plates nshims = 10 No. of Interior Elastomer Layers n = 9 AASHTO 220.127.116.11.3 Total Elastomer Thickness hrt = 4.750 in Total Bearing Height t = 6.00 in OK 2" minimum height per BDM 14.5.8 Bearing Material Properties Elastomer Grade Grade = 3 (Zone the purpose of using steel plates for elastomeric bearing G 9.1 - Steel Bridge Bearing Design and Detailing detailing assumptions for elastomeric bearings 1. The bearings are normally vulcanized to a top plate or sole plate. 2. The bearings are attached to the girder; by field welding or bolting. 3. Mary plates and anchor rods are not normally required. 4. The bearing bears directly on the concrete substructure. 5. Lateral forces on expansion bearings are
Goodco Z-Tech - Elastomeric bearings
Series EL bearings are molded bearings made of high quality natural rubber or neoprene with steel plates vulcanized to the elastomer in such a way that no part of the steel is exposed. Elastomer meets the CAN/CSA-S6-06 standard, and Ontario OPSS 1202 (see Table E-1). Steel conforms to ASTM A-1011 Grade 36, thickness of at least 3 mm. DESIGN Guidance Note Bridge bearings No. 3 - Steel ConstructionFigure 2 Laminated elastomeric bearing For loads in excess of 1000 kN, the bearings may become uneconomically large, such that additional spreader plates and stiffening of the steelwork become necessary. Thus elastomeric bearings are rarely used for steel highway or railway bridges. Movements and rotations are achieved by de- INTRODUCTION ELASTOMERIC BEARINGSBearing provides a stainless-steel-on-PTFE slip plane on top of a conventional Elastomeric Bearing. Daily movements are taken within the elastomer; greater movements cause greater shear force in the elastomer, which overcomes the friction at the PTFE/stainless steel interface thereby accommodating these greater, less Installation Elastomeric Bearings Pads Based on Installation Elastomeric Laminated Bearings with PTFE - Teflon Top and Stainless Steel sliding plates. 1. The PTFE (TEFLON) bearing is supplied as a unit including following components, Cling wrapped. 1. Top SS 316 L sliding plate 2. Center core of laminated/ plain elastomeric bearing with ptfe top. 2. Corbel / pile cap preparation
Lead Rubber Bearing for Bridge or Buildings
The steel plate are fully embedded in the rubber and sealed. Aging resistance. Rubber layer is coated on the surface of the bearing surface to protect the inner rubber. Strong recovery ability. When subjected to large displacement, lead rubber bearings with large ductility will have no residual deformation and can restore by itself. MATERIAL SPECIFICATION FOR BEARINGS - Steel plates shall be according to the following a) All steel plates shall be of uniform thickness. b) Internal steel plates shall be free from sharp edges. c) Steel plates shall be completely bonded on all surfaces to the elastomeric material during molding. Purpose of mary plate (bridge bearing) Engineers Edge the purpose of using steel plates for elastomeric bearingThe mary plates are used for pintles when the elastomeric bearing pressure is not high enough. A larger base plate also spreads the load to the supporting structure if required. If your design cannot overcome the shear force through friction of the pad and concrete then you need to make some mechanical mechanism, thus the pintles. Section Twelve Bridge Bearings - NYSDOT HomeElastomeric bearings may use thin steel laminate reinforcement between the elastomer layers to provide for greater strength, a steel sole plate to allow attachment to steel superstructures, and may use a steel mary plate. Elastomeric bearings perform well during se ismic events because of
Steel Bridge Design Handbook - Bearing Design -
2.1.2 Steel Reinforced Elastomeric Bearings . Steel reinforced elastomeric bearings rely upon both contact surface friction and restraint of the the purpose of using steel plates for elastomeric bearing and pot to the sole and mary plates through bearing and by mechanical connections. the purpose of using steel plates for elastomeric bearing The shear pin serves this purpose when it Steel Bridge Design Handbook - Bearing Design - 2.1.2 Steel Reinforced Elastomeric Bearings . Steel reinforced elastomeric bearings rely upon both contact surface friction and restraint of the the purpose of using steel plates for elastomeric bearing and pot to the sole and mary plates through bearing and by mechanical connections. the purpose of using steel plates for elastomeric bearing The shear pin serves this purpose when it The Effect of Reinforcing Plate on the Stiffness of the purpose of using steel plates for elastomeric bearingThe marine elastomeric bearing consists of an elastomer and several reinforcing inserted plates. Unlike land bearings that are to absorb high-frequency vibration during earthquakes, offshore elastomeric bearings are to support topside-module weight while efficiently absorbing wave-induced hull motions. The bearing is to receive three loads compression, shear, and bending, and providing the purpose of using steel plates for elastomeric bearing The purpose of using steel plates for elastomeric bearing the purpose of using steel plates for elastomeric bearingThe elastomeric bearing will allow for rotation of superstructure. Movement of the superstructure will be accommodated through elastic deformation. Steel plates are embedded inside the elastomeric bearing to increase the stiffness of bearing. The
Use of Bearings under the Bridge 7 Types
Hard copper alloy or stainless steel plate bearings are favoured more than M. S. plate bearings because they are rust free as well as have less frictional resistance. Similar to rocker and roller bearings, two types of plate bearings are used, viz. hinged plate bearing at the fixed end (Fig. 22.1-a) and the sliding plate bearing (Fig. 22.1-b the purpose of using steel plates for elastomeric bearing What is a laminated Elastomeric bearing pad made of?What is a laminated Elastomeric bearing pad made of?Laminated elastomeric bearing pad, one type of reinforced elastomeric bearings, is made of multi-layer rubber and reinforced with steel plate through sulfuration and adhesion.Elastomeric Bearing with Steel Plate Reinforced Which is better lead rubber or plain Elastomeric bearing?Which is better lead rubber or plain Elastomeric bearing?The damping coefficient of plain elastomeric bearing is less than 5%, while the lead rubber bearing is more than 15%. During the earthquake, the lead rubber bearing can increasingly reduce the accelerated speed and uniformly change the large force of the bridge superstructure, thus, lead rubber bearing has better seismic function.Lead Rubber Bearing for Bridge or Buildings Why are steel plates inserted inside the bearings in the purpose of using steel plates for elastomeric bearingHere, I am discussing some important reas behind Steel plates inserted inside the bearing, especially in elastomeric bearings are as follows; For restricting the freedom of bearings to bulge and hence the deflection will get reduced when compared with bearings without any steel plates under the same load.
Why do you need elastomeric bearings for a bridge?Why do you need elastomeric bearings for a bridge?The typical hinge or abutment configuration using many small elastomeric bearing pads has proved highly reliable and redundant. In addition, these bearings are extremely forgiving of loads and translations exceeding those considered in design. Designing and Detailing NotesBridge Bearings - Caltrans WisDOT Bridge Manual Chapter 27 Bearings
bridge and its supporting structure. Plain elastomeric bearing pads can be used for small bridges, in which the vertical loads, translations and rotations are relatively small. Laminated (steel reinforced) elastomeric bearing pads are often used for larger bridges for neoprene elastomeric laminated bearings, bridge the purpose of using steel plates for elastomeric bearingAll external load bearing steel plate(s) if present, shall be factory vulcanized to the elastomeric bearings during the primary molding process. Bearing Acceptance Tests Acceptance Tests of the pads and bearings shall be according to Level I acceptance criteria of Article 18.2.5. This testing shall be included in the price bid for the bearings. sole plate design - Bridge engineering - Eng-TipsOhio DOT has a formula for sole plates for rectangular elastomeric bearings T = C (RW/ (L+1))^.5 - beam flange thickness. where. T = sole plate thickness. C = .194 for grade 36 steel. = .167 for grade 50 steel. R = total reaction in kips including impact. W = width of elastomeric pad transverse to centerline of beam.
File Size 504KB Page Count 10 Elastomeric Bearing with Steel Plate Reinforced
Laminated elastomeric bearing pad, one type of reinforced elastomeric bearings, is made of multi-layer rubber and reinforced with steel plate through sulfuration and adhesion.Compared with non-reinforced elastomeric bearing, it has sufficient vertical rigidity which can reliably transfer the concentrated down-loads and impact loads of the superstructure to both ends of the pier.Structural Member Built Section Vs Solid PlateMay 01, 2018Load on Steel PlateJan 22, 2017Strength of Aluminium base plateJan 29, 2013Steel Plate DeflectionJan 16, 2012See more results Elastomeric Bearings - EkspanThe vulcanized steel reinforcement plates meet the requirements of BS1449. Elastomeric Bearings Natural Rubber strip (Fig. 2) can be utilised to support a concrete diaphragm and natural rubber pads (Fig. 3) are used to support individual beams. These products are commonly used where the vertical loads/translations are relatively low.The elastomeric bearing will allow for rotation of superstructure. Movement of the superstructure will be accommodated through elastic deformation. Steel plates are embedded inside the elastomeric bearing to increase the stiffness of bearing. The bearing will undergo lateral bulging to resist the compression load. In the absence of steel plates.The purpose of using steel plates for elastomeric bearing the purpose of using steel plates for elastomeric bearingWas this helpful? What kind of top plate for elastomeric bearings?What kind of top plate for elastomeric bearings?Elastomeric Bearings Industrial Products Elastomeric Bearings Industrial Products Sliding Top Plate For optimum performance we recommend that the EQF strip slides against a stainless steel top plate. We utilise dissimilar welding rods to weld a 3mm stainless steel sheet to a mild steel backing plate that can then be fixed within your structure.Elastomeric Bearings - Ekspan