The Theoretical And Experimental Research On The Shear-lag Effect In The Continuous Box-girder With Corrugated Steel Webs And Refinement Of Finite Element Modeling

Structures which are made of different materials or different combination of the construction process of the beam can be called composite beam structure. Composite beam structure of this paper is a more special composite structure, it is a combination of steel–concrete box girder structure which is made of corrugated steel webs. This special structures are more advantageous than ordinary concrete box girders in the overall force and lightweight performance.Combined with domestic and foreign literature, this paper make a real bridge model for test. This paper study shear lag effect of the uniform beam bridge with corrugated steel webs based on the real bridge model, it use the finite element analysis andenergy variation method to analyse and contrast, then the final step is make the finite element modeling deeper and further refinement. There are the main conclusions:(1) Firstly, this paper uses theoretical analysis and the energy variational method to pull the theory of this special structures shear lag effect. Then it conclude the solution of the special bridge shear lag effect which under the different load. Secondly, in order to summarize the real data, the bridge model must be tested. Finally, the finite element analysis software MIDAS/FEA simulation can be applied to solve the results. The three shear lag coefficient values were analyzed to verify the accuracy of the analysis of the three methods.(2) This paper use MIDAS/FEA finite element to model the real bridge more detailed. Starting from three aspects:○1 Refinement of Connect form(The form of Corrugated steel webs are not embedded in flange plate and Corrugated steel webs are embedded in flange plate); ○2 Refinement of steel webs unit established(The establishment of steel webs solid elements and shell elements); ○3 Refinement of corrugated steel webs shape(The corrugated steel webs shape is break angle and circular bead). In order to find out the best of the three modeling steps, it must take a lot of discussion, finally, it can conclude a economic finite element modeling method which is Accurate, simple and santisfy the engineering requirements.