Research On Shear Lag Effect Of Double Cells Single Box Girder In Continuous Rigid-Frame Bridge With Corrugated Steel Webs

Composite Girder Bridge with excellent mechanical properties, good seismic performance, can better improve the efficiency of the use of materials, and the advantages of convenient construction, has been widely used in bridge engineering. Therefore, the composite girder bridge has been rapidly developed in our country. On the basis of previous research and design code of some countries, the theoretical analysis method and finite element method were used to study on shear-lag effect for variable cross-section of single box double cells in continuous rigid-frame bridge with corrugated steel web. The main works involved in this dissertation are as follows.At first, the development status and research status of the composite box girder bridge with corrugated steel webs in China and abroad are introduced, and the research theories and methods of shear-lag effect are introduced in this paper. Then the principle of minimum potential energy is used to analyze the shear lag effect of the composite box girder with corrugated steel webs. In the analysis, the theoretical calculation formula of the shear lag effect of the composite box girder with corrugated steel webs under simply supported condition is derived.Secondly, Finite element method was used to study on stress distribution and shear-lag effect of key sections under the dead weight and the prestressing force of the construction stage. Moreover, the stress distribution and shear-lag effect of key sections under the dead weight and basic combination of load were analyzed.Finally, the parameter analysis for shear lag effect of the continuous rigid-frame bridge with corrugated steel webs is analyzed, and width-height ratio, Wide span ratio, inside and outside roof cantilever slab ratio are as shape parameter considered. Then find out the variation law of shear lag effect under the action of concentrated load and uniform load.