Stressing State Analysis Of Integral Abutment And Continuous Concrete Curved Girder Bridge Models

At present,curved girder bridge has been widely used as a kind of bridge with good mechanical performance and flexible layout.But in practical engineering applications,curved girder bridge also has many serious problems,such as many cracks,large deformation,short life and so on.So far,the depth of research on its mechanical performance and working characteristics is insufficient,especially that there is no unified failure criterion for practical engineering.Design and construction have brought great difficulties and hidden dangers.Therefore,in this paper,two typical curved girder bridges are selected,i.e.integral abutment curved girder bridge and continuous curved girder bridge.Based on the generalized strain energy density,the experimental data of the two bridges are re-modeled and analyzed through the theory of structural stressing state.Then the working behavior characteristics of the two bridges are studied.Besides,the corresponding failure criteria and two characteristic loads are proposed and the rationality of the failure criteria is verified at the same time.The main research contents are as follows:Firstly,the generalized strain energy density curve is used to model and analyze the stressing state of integral abutment curved girder bridge and continuous system curved girder bridge.The characteristic loads belonging to two structures are obtained by using M-K criterion.What's more,their main physical meanings are analyzed and their validity are verified.Secondly,based on the experimental data,the displacement and strain data of the two bridge model experiments are analyzed respectively.At the same time,the external forces of continuous system curved girder bridge and integral abutment curved girder bridge are separated,with the whole stress state divided into several sub-modes.The characteristic parameters of these sub-modes are constructed and the actual stressing state changes in the structure are expounded through the changes of these characteristic parameters.Thirdly,the relationship between internal and external energy of integral abutment curved girder bridge is explored by introducing correlation analysis tools and the relationship between internal strain energy and external energy input is analyzed.Subsequently,by introducing the characteristic parameters of coordinative work and strain energy,the coordinative working performance between steel bar and concrete of continuous curved girder bridge is analyzed,while the change of coordinative working performance at different stages of stressing state are studied.Afterwards,the change of strain energy distribution characteristics of different sections of curved beam bridge and the coordinated working performance among different sections is explored.Finally,through the analysis and comparison of the integral abutment curved girder bridge and the continuous curved girder bridge,the common working behavior characteristics and the evolution law of the stressing state in the process of loading are found.Then the essential meaning of structural failure is explored and the common failure criteria of the two bridges are finally found.Therefore,the application scope of the structural stress state theory is extended.