A typical bearing schedule for this purpose is set out in appendix a of section 9. The aashto lrfd bridge design specifications articles referenced in this manual is shown in boldface type within brackets, i. Where hdpe material is used for joint drainage, the material shall be uvresistant. Bridge bearings until the middle of this century, the bearings used consisted of following types. It is intended to be just one part of the total resource package we provide to our customers in support of their success. An integrated magnetic circuit model and finite element. Apr 23, 2015 bridge bearings until the middle of this century, the bearings used consisted of following types. 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. Steel bridge bearing design and detailing guidelines section 1 elastomeric bearings 1. The design shall accommodate the coefficient of thermal expansion of hdpe which is an order of magnitude greater than steel.
These provisions were introduced into the first edition of the lrfd bridge design specifications in 1994. The designer must determine which bearing type is best suited to cost effectively accommodate the design. For a case study, an existing timber bridge was selected. Because bearing rotation was not considered a highpriority issue at that time, the design provisions that were developed were based upon conservative interpretation of. Shape sections, other than pipe and tubing, are typically available in 36, 50, or 50w grades. Due to its condition the bridge should be replaced. This feature makes the design of a bearing that is stiff in. There are currently two alternative templates given for the bearing schedule, one is given in table a. Whenever you think you have a good design, invert it, think of using a completely different type of bearing or mounting, and compare it to what you originally considered. An integrated magnetic circuit model and finite element model approach to magnetic bearing design andrew j. Section 11 joints and bearings october 28 2016 6 bc moti. January 01, 2020 purpose this manual documents policy on bridge design in texas. Bridge design to eurocodes worked examples worked examples presented at the workshop bridge design to eurocodes, vienna, 46 october 2010 support to the implementation, harmonization and further development of the eurocodes y.
A download it once and read it on your kindle device, pc, phones or tablets. Essential question how does a structural engineer design a truss bridge to carry pedestrians from building to building over a heavily traveled thoroughfare. Slopes for drainage troughs shall be maximized and where possible, the. Figure 1 if this movement is re stricted or prevented, a build up of fo rces will cause unde sirable movements or distress and potential failure. Multirotational bearings are recommended for curved girders on skewed supports because. Structural steel of primary members shall satisfy the toughness requirements for zone 3.
Design step 6 design of bearings prestressed concrete. The number of live load lanes applied to the bridge is based on the wholewidth. D, pe retired pdh online pdh center 5272 meadow estates drive. Why did some civilizations discover bearings and others did not. Bridge standards and procedures manual volume 1 section. Steel bridge design handbook bearing design volume 15. Design step 6 design of bearings prestressed concrete bridge design example task order dtfh6102t63032 62 elastomers are flexible under shear and uniaxial deformation, but they are very stiff against volume changes. Alberta transportation bridge structures design criteria v. Pin bearing a pin bearing is a type of fixed bearings that accommodates rotations through the use of a steel. Although many different types of bridge bearings have been used by the nysdot, elastomeric and multirotational bearings are the. Policy for archiving bridge design notes in txdots bridge inspection database management system. Years of extensive experience mean the company understands that bearing design and supply is critical if a project is to be delivered on time and to specification.
Svi structural bearing design 10a design of elastomeric. Bridge bearings are used to transfer forces from the superstructure to the substructure, allowing the following types of movements of the superstructure. Appendix b example problems transportation research board. Jul 01, 2019 bridge design manual individual chapters. This bridge followed aashto lrfd design, which is commonly used to design bridges.
Department of transportation federal high way administration bearing design. The design of a new bridge with steel beams holding a glulam deck. Bearings and expansion joints chapter 9 wsdot bridge design manual m 2350. This manual has been prepared to provide washington state department of transportation wsdot bridge design engineers with a guide to the design criteria, analysis methods, and detailing procedures for the preparation of highway bridge and structure construction plans, specifications, and estimates. At an abutment, a common design feature that facilitates inspection and maintenance of the bearings is the abutment gallery. Pdf innovative design of bridge bearings by the use of uhpfrc. The required design input at the strength limit state is shear force. Fhwa bridge inspection manual section 9 bridge bearings.
The former permits both translational and rotational movements whereas the latter allow rotational and limited translational movements. 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. This chapter also addresses corrosion protection measures. Pdf innovative design of bridge bearings by the use of.
An example of the arrangement for a composite bridge is shown. Elastomeric bearing design rubber compounds are in practical terms incompressible. To integrate knowledge of truss design and analysis, and then, using that integrated understanding, to design, prototype, test, analyze and improve a truss bridge for pedestrians. The following design was developed based upon the above referenced aashto lrfd code. Svi structural bearing design 10a design of elastomeric structural bearings structural bearing design. Those with bearings moved farther faster, and history has yet to stop. Ccl vengineers can adapt their design skills for special projects and specific national codes. Manual bridge cranes custom bridge cranes for special your specifications low headroom bridge crane for extremely low headroom conditions bridge beam operates with a better under clearance dual beam bridge crane for suspension of large fixtures that move parallel to an assembly line for a balanced suspended load condition. The bridge designer will prohibit movement in some bearings and allow movement in others. The information included is intended to permit efficient. The design rule is based on the assumption that rubber is a viscoelastic material, the deflection of which, under compressive loads, is influenced by its shape.
The designer must determine which bearing type is best suited to cost effectively accommodate the. It assists texas bridge designers in applying provisions documented in the aashto lrfd bridge design specifications, to which designers should adhere unless directed otherwise by this document. The designer must determine which bearing type is best suited to cost effectively accommodate the design requirements. This suggests that the displacements generated by pedestrians in this first type of structure will be reduced compared to the second type.
Pdhonline course c485 2 pdh fhwa bridge inspection manual section 9 bridge bearings 2012 instructor. A 4 bearingbeam is characterised by a much higher stiffness than a 2 bearingbeam. Provenza glenn research center, cleveland, ohio andrew kenny and alan b. Threespan continuous straight composite steel igirder bridge 5. Ccls quality management system complies with en iso 9001. There are several types of bridge bearings which have been employed in. This system used load and resistance factors to ensure a stable bridge with sufficient strength. Use features like bookmarks, note taking and highlighting while reading design of bridge structures, 2nd ed. Steel plate is available in 36, 50, and 50w grades. The latest design software and fea is used to optimise bearing design for efficiency and cost. Nchrp project 1271 design specifications and commentary for.
A wide variety of bridge bearing design options are available to you, such as aisi, gb. The primary purpose of this site is for online viewing of the bridge design manual. Bearing pads are designed as per aashto lrfd bridge design specifications2007. Steel bridge bearings may be divided into three general types. The information included is intended to permit efficient fabrication, installation, and maintenance of these bearings. The bearing designer normally the manufacturer will then use this information to determine the design values and therefore the full specification. The bearing design requirements and acceptance tests shall be listed in a bearing schedule.
Bearing used in the construction of bridge structure is divided into two major categories namely expansion bearings and fixed bearings. Delivering quality at every stage, all bridge bearings are designed individually to exacting standards using high specification materials from approved sources. The ccl team draws upon skills from across the group. Contents pdf 278 kb foreword pdf 96 kb chapter 1 general information pdf 1. The design of rolling bearing mountings design examples covering machines, vehicles and equipment. Bridge bearings types of bearings for bridge structures. The 2007 edition of the bdm offers an online keyword search function through the acrobat reader software.
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