Research On The Ultimate Bearing Capacity Of Arch Ring Section Of Rigid Skeleton Concrete Arch Bridge

The reinforced concrete structure with rigid frame is widely used in civil e ngineering because of its good performance of resisting pressure,corrosion,fire and earthquake.For the arch bridge,it has a high requirement of anti-pressure a nd anti-seismic ability,so the arch ring of this kind of structure is very importa nt for the breakthrough of arch bridge in span.This kind of structure is not simple elastomer;There is still a large part of strain-hardening ranges that can work when the stress is too large and differen t materials have complex functions,which makes the bearing capacity of the bri dge and the deformation are not simply linear.And the bearing capacity is relat ed to the safety of the bridge,so it is necessary to study the ultimate bearing capacity of the structure.This paper is based on the construction of Wan Zhou Mi Xi Gou bridge,with the large finite element analysis software to simulate the sexual skeleton streng th concrete short column for the whole process of finite element model of axial compression,and through the simulation results,the influence of different facto rs on the bearing capacity is analyzed and the practical calculation formula of t he whole bearing capacity is fitted.1.This paper expounds the components of this kind of structure,and expo unds the research and development of this kind of structure from the perspectiv es of steel reinforced concrete and concrete-filled steel tube.The research method and significance of ultimate bearing capacity are expounded.The principle and method of nonlinear analysis are expounded theoretically.This method can be u sed for further research.2.The stress-strain nonlinear constitutive model of steel and concrete is re asonably formulated,and the typical stiffness skeleton test components in the ex isting literature were selected.With the help of large finite element analysis soft ware,the finite element model of the whole process of axial compression of th e stiffness skeleton concrete short column is simulated.Comparing the finite ele ment calculation results with the experimental results to verify the correctness o f the modeling method and parameter selection of the finite element model,so as to establish the following stiffness skeleton model.3.According to the method of control variables,different modeling sizes an d materials are proposed.According to the numerical analysis model of the ulti mate bearing capacity of short column members of the stiffniss skeleton concret e of concrete-filled steel tube(CFST),the performance analysis of the externall y packaged concrete,the core concrete and the steel tube during the stress proc ess is carried out,and the stress-strain states of the members in the ultimate sta te are obtained.4.From the analysis results obtained,the influence of different factors such as area ratio,steel content ratio and strength of each material on the ultimate bearing capacity of the stiffniss skeleton concrete members is studied.And throu gh the comparison,the strength relationship of influence of different factors is o btained.5.A simplified formula for calculating the axial bearing capacity of the stiff niss skeleton concrete structures and some Suggestions for the design of dimens ions and materials are put forward.It can be used as a reference for the design and calculation of similar structures.