Design And Research Of Box Pier Based On Mechanical Characteristics

Nowadays,reinforced concrete bridges are developing towards the lightweight structure due to the need for ductile seismic design,and reinforced concrete box piers are widely used in such a large environment,but due to the lack of targeted specifications for such components.The relevant engineering design is more dependent on the experience of the designer,so it is urgent to carry out relevant research on the design method of box pier members.This article optimizes the design methods of reinforced concrete box piers in terms of reinforcement,wall thickness selection,and aspect ratio selection based on existing research results and collation and analysis of various codes.Through the analysis of the finite element simulation results,the mechanical properties of the box pier under different design parameters are analyzed,and the corresponding design ideas are further given.The pseudostatic tests of the reinforced concrete box pier specimens with different design parameters are carried out.Through the analysis of the test results,the correctness of the box-type pier design research is verified.The main research contents of this article are as follows:(1)Taking the main bridge pier of the Huluhe Super Large Bridge as a background project,according to the mechanical characteristics of the box pier and the principle of mechanical equivalence,six scaled test specimens of reinforced concrete box pier were designed and A one-way horizontal static test under constant axial pressure was conducted.(2)Study the deformation and failure mechanism of the box-shaped pier under the lowcycle reciprocating load,observe the failure form of the test piece,and record the horizontal displacement value and the horizontal load Changes.By analyzing the characteristic displacement and corresponding load of the box-shaped pier specimens,we can understand the influence of wall thickness,section length-to-width ratio and longitudinal reinforcement ratio on the ductility and bearing capacity of the box-shaped pier,and propose reasonable design of such members Suggest.(3)Based on the design parameters of the test components of 6 box piers,a finite element numerical model of reinforced concrete box piers was established.By selecting the appropriate material constitutive model and reasonable boundary conditions,the The mechanical behavior of box-type pier under low-cycle reciprocating load;combined with the comparative analysis of the simulation results of finite element and test results,the ductility performance of box-type pier under different wall thickness,section length-towidth ratio and longitudinal reinforcement ratio was studied The bearing capacity also verifies the applicability of the finite element model,and puts forward more detailed design ideas for such components.