Lecture13 - Influence Lines

Lecture13 - Influence Lines - Lecture # 13 Continuous Beams...

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Lecture # 13 Continuous Beams and The Use of Influence Lines in Bridge Design
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The Advantages of Using Continuous Beams versus Simply-supported Beams: A single continuous beams has several advantages over simply supported beams: 1) Reduces the number of deck joints, 2) Reduces the number of bearings, 3) Increases the span lengths, 4) Needs shallower girders and lighter beams. The first reason is probably the most important, because corrosion is a major component of bridge deck joints, as shown in the next few slides. Minimizing the number of joints is a major improvement in the design of a highway bridge. This is especially true in northern states, that use large quantities of salt on bridge decks in order to eliminate ice during the winter months. The salt gets washed down the joints and coat the steel and concrete components of the bridge, including parts not easily inspected.
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Connection Corrosion Connection Corrosion Plate Girders Longitudinal Stiffener
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Connection Corrosion Connection Corrosion Stiffener Bearing Clearance 5” 6” F L O R B E A M
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Lecture13 - Influence Lines - Lecture # 13 Continuous Beams...

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