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Metal Girder Bridge

Basics Of Bridge Design, Bridge Truss Types And Its Design

There are four major factors used in describing a bridge. By combining these terms one can give a general description of most bridge design types.

# span (simple, continuous, cantilever),
# material (stone, concrete, metal, etc.),
# placement of the travel surface in relation to the structure (deck, through),
# form (beam, arch, truss, etc.)

The three basic types of spans are – simple spans, continuous spans and cantilever spans. Any of these spans may be constructed using beams, girders or trusses. Arch bridges are either simple or continuous (hinged). A cantilever bridge may also include a suspended span.

Examples of the three common surface configurations are - Deck, Pony and Through. In a Deck configuration, traffic travels on top of the main structure; in a Pony configuration, traffic travels between parallel superstructures which are not cross-braced at the top; in a Through configuration, traffic travels through the superstructure (usually a truss) which is cross-braced above and below the traffic.

Simple deck beam bridges are usually metal or reinforced concrete. Other beam and girder types are constructed of metal. The end section of the two deck configuration shows the cross-bracing commonly used between beams. The pony end section shows knee braces which prevent dality  Astrology Spirituality  Christianity Spirituality  Feng Shui Spirituality  Graphology Spirituality  Kabbalah Spirituality  Meditation Spirituality  Metaphysics Spirituality  Mysticism Spirituality  New Age Spirituality  Numerology Spirituality  Reiki Spirituality  Religion Spirituality  Tarot Sports and Fitness Sports and Fitness  Aerobics Sports and Fitness  Archery Sports and Fitness  Baseball Sports and Fitness  Basketball Sports and Fitness  Bodybuilding Sports and Fitness  Cricket

A truss is a structure made of many smaller parts. Once constructed of wooden timbers, and later including iron tension members, most truss bridges are built of metal. Types of truss bridges are also identified by the terms deck, pony and through which describe the placement of the travel surface in relation to the superstructure (see drawings above). The king post truss is the simplest type; the queen post truss adds a horizontal top chord to achieve a longer span, but the center panel tends to be less rigid due to its lack of diagonal bracing.

Should you have any queries or need more information on bridge truss design and construction, please feel free to contact us.

Email us at info@outsourcestructuraldrafting.com  

Visit us at http://www.outsourcestructuraldrafting.com/ to get more information.

About the Author

Richard Bose is structural engineer at OSD – an established Structural drafting design consultant offering full services such as structural design analysis, structural drafting and shop drawings services at affordable rates. Email us info@outsourcestructuraldrafting.com

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