| The paper mainly analyses the prestressed steel box girder. It?s major content includes three aspects: civil and foreign situation, level, developing trend and demand of economic construction of prestressed steel box girder; dynamic force analysis of prestressed steel box girder and engineering practical example. By studying a great deal of civil and foreign literature material and reviewing the developing process of prestressed steel structure and its increasingly dominant status in the foundation construction, the paper generalizes that prestressed steel box girder will be used abroad in the super structure of bridge, while adapts distributing parameter system and finite element method when the dynamic force analysis of prestressed steel box girder is done, in order to fix on the free vibration frequency and vibration form of girder. Finally, the paper compares the test result of model experiment with the calculating result of the paper, they inosculate well each other. |
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