1. Bridge Load Tests involve test trucks, data acquisition and computer models. Field inspection Bridge load test Data acquisition system FEM computer model

2. 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.

3. 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

4. Girder end restraint is a variable factor during load tests. Debris between girder ends Spring restraint used in the model

5. Suitable mesh density is selected to get an accurate and efficient model.

6. We set the plate thickness equal to the N.A depth from measurements.

7. Special test truck loads and five different load positions were used in the FEM model. Load position 1

8. Typical strain data from bridge test.

9. A ½-scale bridge girder was constructed in the lab to verify transducer accuracy. Wood form Pouring concrete Tested beam

10. Test load system: load cell, hydraulic cylinder pump and spread beam

11. We built a FEM model of the lab-beam.