| Girder bridge with corrugated steel webs is a new type of composite bridge. Compared with traditional concrete or steel bridges, Girder bridge with corrugated steel webs has many advantages, such as high efficiency of prestress, clearly structural performance, less web cracking, fast construction, beautiful shape and good seismic performance.It has been widely used in European countries, Japan, China and other countries in recent years.In terms of the composite girder bridge with corrugated steel webs, it will be huge leap in future\as its advantages are incressing obvious. Cantilever construction method with variable cross-section is widely used in progrects,with the spanning of cross-section. The existed studies generally describe simply and qualitatively on shear properties of corrugated steel webs.Most of these studies have suggested that the whole shear is bear by the corrugated steel webs without the participant of concrete roof and floor, which is different from the actual stress state of the girder bridge with variable cross-section. Based on girder bridge with variable cross-section and corrugated steel webs, this dissertation discuss shear performance during cantilever construction.1. Investigating the development and research in composite bridge with corrugated steel webs in China and other countries, summarize achievement in shear buckling and shear performance, additionally,it’s concluded all calculations of shear stress, and buckling formulation when corrugated steel webs in elastic and non-elastic state.2. In order to investigate the shear behaviors of girder bridge with variable cross-section and corrugated steel webs during cantilever construction, this dissertation provides the design of an experiment based on a long-span non-prismatic box girder bridge with corrugated steel webs, study of their characters during cantilever construction and comparison of the results of experiment and finite element analysis. Moreover it has been discussed the effect of concrete, and the distribution of shear stress of steel webs and the proportion of corrugated steel webs in resisting shear force.3. Based on finite element analysis model, we discuss the effect of some parameters, which affect shear behaviors of girder bridge with variable cross-section and corrugated steel webs, providing some suggestions and references to design and construction.4. It has been summarized the shear performance of composite web near the top of bridge pier based on results of experiment and finite element analysis model to study the effect of concrete and provide some suggestions and references to the arrangement of the length of concrete. |
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