| Recently, with the development of urban construction and the pursuit of beauty and environment coordination, the multi-cell box girder with arc-shape bottom is applied in the building of city viaduct more and more popular, which is the symbol of the city building. As a result of point support were used in the curved bottom cross-section, that the special behavior of this kind of structure are complex. So, it is necessary to systematical study the mechanic characteristics of this kind of bridge, as it can solve the analysis and design of the key technical problems and provide technical support to the city's applications of wide curved box-girder in city viaduct.Based on the space static and dynamic performance and quality assessment of relevant problems, the stratified beam grid model for spatial analysis of wide curved box-girder is established. This paper mainly discusses the regularity of special behavior under different types of loads. The research work of the paper are as the following:(1) Stratified beam grid model for spatial analysis of wide curved box-girder is established that by the finite element method.(2) The lateral mechanic characteristics of the bridge are analysised, which under the dead weight, vehicle load, concentrated load and the single wheel load. The structural factors on the transverse force of structure are analysised.(3) The longitudinal mechanic characteristics of the bridge are analysised, which under the dead weight, lane load and concentrated load.(4) The transverse pre stress spatial effect is discussed in this paper. |
