Theoretical And Experimental Study On Transverse Load Distribution Of Simply Supported Small Box Girder

The actual stress state of simply supported beam bridge is a complex spatial problem,which is generally transformed into a reasonable and simple plane problem to solve,that is,the concept of "lateral distribution of load" is adopted.The existing theoretical calculation methods of load lateral distribution coefficient all have certain assumptions and applicable scope,which simplify the calculation structure system,making the calculation result have certain deviation from the actual structure.In order to make the calculation results more consistent with the actual project,based on the theoretical basis of rigidly connected beam method,this paper deduced the modified rigidly connected beam method suitable for simply supported box girder bridge,considering the influence of the thickness of bridge deck pavement and the distortion deflection of box girder,and verified the feasibility of the method with a real bridge test of a simply supported girder bridge in Xichang city.The main research contents are as follows:1.The basic theory of the transverse distribution coefficient of load is summarized,introduce the existing theoretical calculation methods of the transverse distribution coefficient of load and their corresponding assumptions and application scope,define the theoretical calculation methods suitable for the simply-supported box girder bridge according to the structural characteristics of small box girder,and analyze the shortcomings of the existing methods in the application of the simply-supported box girder bridge.2.Based on the existing theoretical calculation method of rigid beam method,considering the effect of bridge deck pavement and the distortion and deformation of box girder,the theoretical calculation formula is modified,and the revised calculation formula is deduced.3.The engineering background of a simply supported beam bridge in xichang,beam finite element model is set up and carry on the real bridge test,according to the actual bridge load test measured deflection,strain data,such as the finite element method respectively,just answer beam method and the traditional correction just pick beam method,analyzes the load transverse distribution and analysis comparison,so as to verify the reliability of the modified just answer beam method.