Balancing of Movable Bridges by the Strain Gauge Technique

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-120 KIP FEETA = HORrZONTAL MOMENTB = VERTICAL MOMENTWL= MAXIMUM MOMENTA= WL CDS ANGLEB= WL SIN ANGLEJfigure 3, EXAMPLE BASCULE BALANCE STATE
The Balance StateNo set standard of bridge balance has been widely established withthe condition of balance usually being determined by the Engineer.The factors considered in determining the best balance state areoften:SafetyWhen balancing the span, it is desireable that with the motor offand the brakes released the span should not raise from its loweredposition. On most bridges, this usually entails making the bridgeslightly span heavy. On many bascule bridges the counterweight ispart of the deck structure. A live load passing over thecounterweight will tend to lift the span. Increasing the leafweight or reducing the counterweight may be necessary to counterthis effect.Machine Wear and LoadMuch of the financial gains to be made by balancing a bridge arein increased equipment life. This is accomplished by reducedoperating loads. Span loads can be made to lessen with opening oreven made negative at the fully opened position if desired.Structural WearWhen lowered, the spans should be well seated on the live loadbearing to reduce pumping of the bearings. This minimizes anunwanted transmission of loads through the structure and thetransmission of undue load to the drive machinery. The spanlifting forces should be applied evenly to the structure to avoidtorquing of the span.
Page 1 and 2: At4ERICM CONSULTING ENGINEERS COUNC
Page 3 and 4: IntroductionSeveral moveable bridge
Page 5: Test MethodThis test method for bal
Page 9 and 10: Data ReductionTo analyze the balanc
Page 11 and 12: For bascule spans, leaf moment is d
Page 13: 3. Calculate the vertical and horiz
Page 17 and 18: Case Study No. 1The Route 52 Ocean
Page 19: Case Study No. 3EBThe Eastern Boule
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Balancing of Movable Bridges by the Strain Gauge Technique

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