Essay on The Physics of Bridges - 3539 Words

The Physics of Bridges The design of the bridge superstructure is based on a set of loading conditions which the component or element must withstand. A bridge engineer must take into account a wide variety of loads which may vary based on the duration of the load (permanent or temporary), the direction of the load (vertical, longitudinal, etc.), and the effect of the load (shear, bending, torsion, etc.). In order to form a consistent basis for design, organizations like AASHTO, American Association of State Highway and Transportation Officials, have developed a set of standard loading conditions which are applied to the engineers design model of the structure. Other nations maintain their own set of design loads like the BS†¦show more content†¦From the table 1.1 the designer would separate items such as sidewalks, railings, parapets, signing, utilities, and the wearing of the surface. Pressures due to earth and water are also considered permanent loads. While these loads primarily affect substructure elements, they have the potential of impacting superstructure elements as well at points where these two components interface (e.g., at the abutment backwall). This gives us a good reminder that while we are discussing the structures individual components, we can not lose sight of the structure as a whole. Temporary loads are those loads, which are placed on a bridge for only a short period of time. Just as dead loads are the permanent loading condition, live loads represent the major temporary loading condition. There are, however, several other classes of temporary loads, which the designer must consider. The temporary loads are: vehicle live load, earthquake live load, wind loading, channel forces, centrifugal forces, impact forces, and erection loads. The term live load means a load that moves along the length of a span. Therefore, a person walking along the bridge can be considered live load. Obviously, a highway bridgeShow MoreRelatedThe Physics of Bridges Essay541 Words   |  3 PagesPhysics of Bridges The physics behind bridges is more complex than first meets the eye. To assure that a bridge is well-supported many concepts must be understood and used in the correct manner. What is a bridge? A bridge is a complex structure allowing passage across an obstacle: a structure that is built above and across a river, road, or other obstacle to allow people or vehicles to cross it. Bridge forms There are four major forms of bridges: beam, truss, arch, and suspension. A beamRead MoreEssay on The Physics of a Truss Bridge985 Words   |  4 PagesTruss Bridge Physics 141 Robin Hoffmeister There is many reason that we need bridges in every day of our life, from sufficient means to pass over a roadway, waterway, railway, or other structure. You don’t even think about them because it takes no effort to get over them and they are just there for your use. 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