| The existence time of the arch structure is long.In the actual project,it’s carrying capacity,beautiful appearance,long span,and many other advantages,such as bridge in the engineering field as well as the subway tunnel excavation support,dams and other aspects of a wide range of applications.The concrete filled steel tube(CFST)arch bridges are the most representative application,since the first CFST arch built in China 1990,so far it has as a new form of bridge structure in our country got fast development,the span about 50 more than 200 meters,maximum span has more than 500 meters.The arch structure development speed is very fast,continuous constrLuction method and the emergence of new bridge.However,compared with the wide application and construction speed,it is very urgent and necessary to carry out the research on the arch bridge.Thus,this paper is intended to investigate the rise span ratio of arch structure,and the following parts are concluded:(1)different rise-span ratio of arch structure finite element model is established and the static analysisBased on the large general finite element software Midas-civil analysis and static performance of CFST arch,analysis the main steps include in keeping the span,the basic cross section under the constant parameters such as shape,material parameters,establish finite element model of multiple different rise-span ratio and the same loading respectively,solving and post-processing four stages.Different rise-span ratio of arch structure internal force,bending moment and displacement have a clear understanding,the establishment of the finite element model is not only the foundation of subsequent analysis,is also the conclusion of theoretical analysis of the validation.(2)in this paper,first using the virtual work principle and generalized variational principle of the clamped boundary conditions is deduced and the parabolic arch under vertical uniformly distributed load calculation expression,over-load-displacement internal force-different rise-span ratio of the four relations,through the system total energy equation of variation for the arch axis,vertical balance differential equation,parabolic arch buckling is established before and the relationship between the buckling load and axial pressure and the expression between vertical displacement,is mainly studied different rise-span ratio on in-plane buckling characteristics of the parabolic arch structure,as well as to the arch structure buckling when the path of change and the corresponding internal force of the impact.And make the different depth under the parameters of load-displacement and load-in an attempt to. |
