| The research in this paper is an important part of the 3D analysis of dynamic and seismic response of large-span curved bridges with high piers which is a sub project of the national transportation scientifical project in western regions, the research of the design and construction technology of large-span curved bridges with high piers. For the advantages in economics, structural mechanics and styles, continuous rigid frame bridges are widely used at present. The seismic performance is one of the controlling factors in the design of the bridge type.In order to seek the sensitive parameters of the bridge type under earthquake, calculation models of the large-span straight and curved continuous rigid frame bridges with high piers are proposed with finite element methods, respectively. The dynamic behavior and seismic performance are analyzed. The emphasis is put on the analysis of seismic response influence due to design parameters of substructure.For straight continuous rigid frame bridges, orthogonal experiment method, which can save a lot of work, is adopted in the numerical experiment. The factors considered include the height of the piers, calculation models of sub-structures, effect of traveling waves, numbers of the spans, and types of earthquake waves. Longitudinal and lateral excitations are carried out, respectively.As to curved continuous rigid frame bridges, single factor analysis is proposed. Firstly, the critical angle of seismic wave input is discussed, and then the influence of height of piers and SSI (Soil-Structure Interaction) are studied. Finally, the effect of traveling wave is discussed. The comparison between straight and curved continuous rigid frame bridges is conducted at the same time.On the basis of a great amount of numerical analyses, some useful conclusions about the seismic behavior are drawn correspondingly, which can give instructions to the design of the same bridge type. |
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