ABSTRACT
In order to obtain the stress state of steel main girder and steel bars in bridge deck during the construction of continuous steel-concrete composite girder bridge, a continuous composite steel girder bridge with spans of 3×35+3×35 has been selected as a model to analysis. Stress sensors were arranged at 3/8L position of side span and pier top to measure the stress of top and bottom slabs on the steel main girder. Stress sensors were embedded at pier top, 0.15L away from the pier top and 3/8L positions of side span to measure the stress of steel bars in bridge deck. The finite element model of the continuous steel-concrete composite girder bridge was established to obtain the theoretical stress values of the bridge under different construction stages. The static and dynamic load tests were carried out when the bridge was completed. The results show that the theoretical values of different conditions are in good agreement with the monitoring and load test data; the maximum stress of steel main girder and steel bars are 91.9MPa and 30.94MPa respectively when the asphalt pavement is completed; the testing span is still on the elastic state under the design load; the rigidity, strength and overall dynamic stiffness of the bridge meet the design requirements. The rationality of bridge design is verified which can provide technical experience for similar bridge construction.
