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Published byLorena Johnston Modified over 8 years ago
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Bridge Load Tests involve test trucks, data acquisition and computer models. Field inspection Bridge load test Data acquisition system FEM computer model
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Building a FEM computer model of bridge response can squeeze additional information out of expensive test results. More than ten people, much equipment and three days. Just one man and a computer.
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Concrete strength is usually unknown during a bridge test. Drilling holes will damage the bridge deck An assumed strength value is used to calculate Ec
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Girder end restraint is a variable factor during load tests. Debris between girder ends Spring restraint used in the model
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Suitable mesh density is selected to get an accurate and efficient model.
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We set the plate thickness equal to the N.A depth from measurements.
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Special test truck loads and five different load positions were used in the FEM model. Load position 1
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Typical strain data from bridge test.
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A ½-scale bridge girder was constructed in the lab to verify transducer accuracy. Wood form Pouring concrete Tested beam
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Test load system: load cell, hydraulic cylinder pump and spread beam
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We built a FEM model of the lab-beam.
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