The purpose of a bearing is to allow controlled movement and thereby reduce the stresses involved. Bearing calculation when selecting an axlebox bearing or unit, skf should be contacted for assistance with necessary calculations. A bridge bearing is a superstructure element that provides an interface between the superstructure and the substructure. The average bearing pressure on the concrete is 20 mpa. Tapered roller bearing trb the inner race is called cone and the outer race,cup. The response to the surveys was overwhelming and they made this thesis a success. View and download powerpoint presentations on bearing ppt. Nbc bearings training ppt free download as powerpoint presentation. Sep 17, 2016 download free bridge design and analysis spreadsheets essential for bridge engineering published on september 17, 2016 september 17, 2016 17 likes 7 comments. This bearing powerpoint ppt template is designed for effective powerpoint slides with a colorful powerpoint background and theme. 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. In all instances, the use of intermediate expansion joints should be avoided wherever possible.
Apr 23, 2015 bridge bearings until the middle of this century, the bearings used consisted of following types. Discuss the architecture and ingenuity that goes on in the constructing of worlds most innovative bridge designs through free civil engineering ppt themes founding under the bridge tag. Possible causes of movement are thermal expansion and contraction, creep, shrinkage, or fatigue due to the properties of the material used for the bearing. Ppt bearings powerpoint presentation free to view id. It permits a relative motion between the contact surfaces of the members, while carrying the load. Articulation is the term for the configuration of bridge supports and choice of structural bearings that provides the necessary restraints to the superstructure whilst at the same time providing freedom to some displacements and rotations in order to avoid unnecessary forces on both the superstructure and substructure due to constraint a range of different bearing types is available. Chart and diagram slides for powerpoint beautifully designed chart and diagram s for powerpoint with visually stunning graphics and animation effects. Bridge bearings types of bearings for bridge structures. A rotary bearing allows motion about a center, such as a ppt. Make vacuum preloaded spherical air bearings without special tools duration. April 20 nmdot bridge procedures 11 and design guide chapter one general information the new mexico department of transportation uses the current edition of the aashto. To allow rotation caused by dead load and live load deflection.
A bearing is a machine element which supports another moving machine element known as journal. The latest design software and fea is used to optimise bearing design for efficiency and cost. The normal length of a upper bearing plate should be composed of the following components. Prelubricated sealed ball bearing 27 thrust ball bearings 28 types of ball bearings 29. Civic center building berkeley, california, usa 1995. It is of critical importance both in the design of new bridges and in the evaluation of the load carrying capacity of existing bridges. Pot bearing, also known as pot rubber bearing, with elastomeric bearing embedded inside of the steel plate, can be divided into fixed pot bearing, guided pot bearing and free sliding pot bearing. View and download powerpoint presentations on bearings ppt. Tp sq hole ctrs hole ctrs hole dia height mass reference no. Bridge bearings are extensively used for enhancing structural life of the bridge and provide seamless absorption and transmission of load and have a long functional life. Trusses have been used in a similar way to beams in composite decks oresund approach spans, as arches sydney harbour bridge, as cantilevers forth rail bridge or as stiffening girders to suspension bridges forth road bridge. Kansas department of transportation bridge construction manual version 107 kdot bridge section 10. Skf can provide a portfolio of different calculation methods to optimize bearing selection for any kind of application. Bridge articulation and bearing specification from articulation is the term for the configuration of bridge supports and choice of structural bearings that provides the necessary restraints to the superstructure whilst at the same time providing freedom to some displacements and rotations in order to avoid unnecessary.
These are made by using the finest grades of basic components that are made from premium grades. Jun 12, 2019 bridge live load distribution powerpoint presentation live load distribution on highway bridges is a key response quantity in determining member size and, consequently, strength and serviceability. In situations where bridge skew angles exceed 30 degrees, consult the bearing and expansion joint specialist and the bridge design engineer for recommendations and approval. Ccls quality management system complies with en iso 9001. Matlab file, matlab function, truss analysis, plane truss, visualization, view all files of finite elements method.
Our new crystalgraphics chart and diagram slides for powerpoint is a collection of over impressively designed datadriven chart and editable diagram s guaranteed to impress any audience. The required design input at the strength limit state is shear force. Templates under this tag cover maritime bridges, suspension bridges, and the long bridge. Find powerpoint presentations and slides using the power of, find free presentations research about bearing ppt. The bridge is pretty small in cross section 900mm wide x mm deep with a 530mm diameter hole and a 600mm long wide flangecantilever slab on either side. However, bridge bearings could create more problems for the bridge structure than it solves if not properly understood, especially. Download free bridge design and analysis spreadsheets essential for bridge engineering published on september 17, 2016 september 17, 2016 17 likes 7 comments. These are made by using the finest grades of basic components that are made from premium grades of stainless steel alloys and other raw materials. Bearings are important elements in large infrastructures such as bridges, heavy buildings and high rise buildings, ensuring load transfer, movement, rotation, vertical or horizontal restraints as required by the design at critical locations in a structure. 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. To transmit loads from the superstructure to the substructure. To the greatest extent possible, the document coalesces the research, development and application of shallow foundation support for transportation structures over the last several decades. The following table provides guidance regarding maximum bridge superstructure. Basic calculation principles are mentioned in this chapter, to give an overview of.
Bridge live load distribution powerpoint presentation live load distribution on highway bridges is a key response quantity in determining member size and, consequently, strength and serviceability. Delivering quality at every stage, all bridge bearings are designed individually to exacting standards using high specification materials from approved sources. Use the above bearing powerpoint ppt template to make your amazing ppt. Ppt bering land bridge powerpoint presentation free to. 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.
Find powerpoint presentations and slides using the power of, find free presentations research about bearings ppt. The concept of a bearing to lessen friction between an object and the surface over. Trb can take both radial and axial loads and used for gear boxes for heavy trucks, bevelgear transmission, lathe spindles, etc. Fit the flexible nose piece to the form of your nose bridge. The layout of each track must be completely parallel on one side of the bridge versus the other. Fhwa bridge inspection manual section 9 bridge bearings. A bridge bearing is a component of a bridge which typically provides a resting surface between bridge piers and the bridge deck. Pot bearings for bridges and structures plain bearing products. Bridge live load distribution powerpoint presentation. A rotary bearing allows motion about a center, such as a wheel on a shaft or a shaft through a housing. It was located where the bering strait is today, between russia and north america. Hospital long beach, california, usa 1995 lead rubber isolator, rubber isolator, and sliding bearing 11. Rocker bridge bearing pin bearing is a fixed bearing that make room for rotation movement through the application of steel pin. If a mask has elastic head bands, separate the two bands, hold the mask in one hand and the bands in the other.
Bridge bearings are used to transfer forces from the superstructure to the substructure, allowing the following types of movements of the superstructure. Pot bearings are special types of bridge bearings for taking large loads, large horizontal displacements and large rotation requirements in confined areas. Download free bridge ppt designs to highlight engineering marvels in front of high school or college students. 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. 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. Possible causes of movement are thermal expansion and contraction, creep, shrinkage, or fatigue due to the properties. Pin bearing a pin bearing is a type of fixed bearings that accommodates rotations through the use of a steel. Pot bearings are special types of bridge bearings for taking large loads, large horizontal displacements and large rotation requirements in confined. For example, this means when bridge traffic runs east and west, the north and south track plates must be completely parallel. Technical report documentation page transportation. Download bearing powerpoint ppt templates for a good powerpoint ppt. In order to select an appropriate bearing device, the magnitude of horizontal and vertical forces transmitted through the bearing assembly and the amount of displacement and rotation of superstructure elements must be considered. This is the culmination of seven years of effort beginning in 2005.
Load load aa b ad ae g h kn kn mm mm mm mm mm mm kg. The maximum horizontal load can only be applied if it is less than 33% of the simultaneous vertical load. The three primary functions of a bridge bearing are. Place and hold the mask over your nose, mouth, and chin, then stretch the bands over. Bridge construction manual guidelines to project supervisors bridge engineering page 3 revision. Bridge bearing devices are classifi ed as fixed or expansion. Our bearing powerpoint ppt templates are editable and can be. What is preset during installation of bridge bearings. A truss is a triangulated framework of individual elements or members which act primarily in tension or compression. 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.
Ppt bearings for bridges powerpoint presentation, free. Preset is a method to reduce the size of upper plates of sliding bearings in order to save the material cost. Caltrans traffic management center san diego, california, usa 1994 highdamping rubber bearings 10. Bridges and other large structures are supported on bearing devices to transmit forces while accomodating all structural movements. Steel bridge design handbook bearing design volume 15. The deck is simply supported by fixed bearings at one end and free bearings at the other end. Bridge bearings types of bearings for bridge structures and. Fixe d devices are called bolsters and only allow rotation at that support location. Flexible pavement design, calculator, sn, aashto design, structural number. Download free bridge design and analysis spreadsheets. Bridge bearings until the middle of this century, the bearings used consisted of following types.
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