| The new structure of prestressed concrete box girder for double-decked traffic is a ideal form for making the bridge to achieve double traffic.Combined with the tutor's National Natural Science Fund Project-Research on the Mechanics and Design Method of Double-deck Traffic Concrete Box Girder(Project approval number: 51378202),this paper focus on the study of the force path of the test model of double-layer traffic box girder.The main work of the paper is as follows:(1)Based on the experimental study of single point loading(six cases)and combined loading(six cases)in the elastic range of the box girder model,the deflection and strain of the three control sections of the box girder model are measured,as well as the local deflection and strain of single-point loading of plates and stiffeners.(2)The numerical model of double-layer traffic box girder is established by using finite element ABAQUS by choosing material parameters and unit type reasonably.Then the test conditions were simulated,and the analysis data and experimental data were compared.The results obtained are in good agreement with the experimental results,and the reasonable feasibility of the numerical model is verified.(3)On the basis of reasonable and feasible numerical model,the loading position of the four working conditions in the roof loading is adjusted to the position corresponding to the bottom plate,and the results are compared with the analysis results when the roof is loaded.It is found that the whole change pattern is basically the same..(4)Based on the comparison with the numerical analysis results,the lateral rigid beam method is modified and the transverse distribution law of the node loading is obtained by using the rigid beam method,the transverse rigid beam method and the displacement deflection method to calculate the lateral distribution coefficient of the node loading.Then the force path of the box girder model is basically obtained. |
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