Continuous Rigid Frame Box Girder Bridge Single Box Double Rooms Spatial Effect Analysis

In recent years we economy continues to advance,the urbanization process continues to move forward,for transportation,too.Construction of the bridge in a very central position in the transport.With the continuous development of science and technology,the bridge span in the fast increase in the mechanical properties of the bridge has been improved,many new forms and structures keep coming into practice,but also a wide variety of cross-section in the form of a bridge constantly be used,in which rigid frame bridge box section is the most common structure is often used in the new cross-section appears.This paper mainly do the following work and research:1?briefly introduces the development situation of the continuous rigid frame bridge,and the structure characteristics and the concept of shear lag effect,the causes of and research the status quo.2?the paper introduces the theory of thin-walled box girder is wide and box beam shear lag effect to solve by the variational principle,and the different types of shear lag effect of box girder bridge solution formulas were derived.3?8.32 with the beam element with MIDAS/CIVIL huaihe river highway bridge two finite element model is established,and has carried on the static load analysis and calculation,and has carried on the analysis of shear lag.4?using MIDAS/FEA V3.6 to 0 piece of space solid element finite element model is established,and the lower edge of the normal stress on the static load effect they value,through out the stress value of huaihe river highway bridge two shear lag is analyzed.5?through the huaihe river highway bridge two monitoring of strain gauge measured values on the shear lag correction.Basic to the scene of the curve of shear lag of box girder cross section distribution regularity of shear lag.And through the analysis of the measured values as a result,the huaihe river highway bridge two stress is optimized.6?the last of the huaihe river highway bridge two single box double chamber the influence factors of the shear lag of box girder bridge calculation,in this article respectively for wide box girder of the bridge span ratio,aspect ratio and flange width of the shear lag effect is analyzed.