Mechanical Character and Experimental Research on Shear Lag Effect in Cantilevered Composite Box-girder with Corrugated Webs
|School||Nanjing University of Aeronautics and Astronautics|
|Course||Road and Railway Engineering|
|Keywords||Cantilever Corrugated Steel Webs Composite Box Girder Shear Lag Effect Negative Shear Lag Effect Model test Finite Element Analysis|
This new corrugated steel webs box girder bridge structure is based on reducing the web thickness , thereby reducing the weight box girder to reduce the amount of prestressing tendons this line of thought . After nearly two decades of development , the combination box girder with corrugated steel webs made ??some research , and has completed a number of practical engineering , but many issues have not been resolved completely , and even a lot of research has not yet commenced . This article relying Science Foundation project , launched a pilot study box girder cantilever waveform webs , mainly to complete the following work : Corrugated Steel Webs cantilever box girder in the elastic stage symmetrical eccentric loading model test, verify that the cross-section of abdominal the board comply with the proposed plane section assumes that the strain along the height distribution , and analysis of its curved scissors effect . For Cantilever waveform web shear lag effect research , according to box girder longitudinal displacement function , calculated by the shear lag warping function method , based on the energy variational method based on the principle of minimum potential energy to obtain differential equations with boundary conditions . Variable cross-section cantilever box girder differential equations , differential equations and boundary conditions etc. Box Section evolved . The derived the cantilever waveform Box Girder shear lag effect of uniform cross section , variable cross-section formula . Test , finite element and theoretical analysis of the data shows that the three results are in good agreement . On this basis , summarizes the changes in the cantilever Corrugated Steel Webs shear lag effect , and analysis of the major influencing factors , and to provide a reference for the calculation of shear lag effect for about cantilever Corrugated Steel Webs . 4 theoretical change No. phenomenon appears due to shear lag due to additional bending moment along the span direction , leading to negative shear lag effect appear uniform loads . But the cantilever negative shear lag effect area with flat webs differ , and analysis of the negative shear lag effect along the vertical distribution law .