Optimization design method and system for arch bridge with suspender under moving load

Abstract

The invention relates to a suspender arch bridge optimization design method and system under moving load, and the method comprises the steps: S1, drawing up the size of each member of an arch bridge, and building a finite element model; s2, on the basis of linear static force calculation, a finished bridge suspender force is obtained and serves as an initial optimization value of the finished bridge suspender force; s3, on the basis of the stability and strength effect of the main arch, forming a moving load immobilization working condition, and loading the moving load according to a fixed position; s4, calculating the moving load and the initial defect based on nonlinear calculation, and iteratively optimizing the optimal suspender force; s5, completing the design of residual components according to a conventional method; the system adopts the methods of S1 to S5; according to the method, the strength and stability of the main arch are considered, the moving load and the initial defect are considered for iterative optimization, the better finished bridge suspender force is solved, the design result is closer to the actual situation of the bridge, the bridge safety performance is higher, the method is easy to achieve in a programmed mode, the optimization speed can be adaptively changed, and the method can be used for large-scale optimization design of the large-span arch bridge. And the economical efficiency is higher.

Description

technical field [0001] The invention relates to the technical field of arch bridge design, in particular to an optimal design method and system for an arch bridge with hangers under moving loads. Background technique [0002] Arch bridges with hangers can be divided into two types according to the force sharing between beams and arches: rigid-beam flexible arch bridges and rigid-arch flexible-beam bridges. A bridge in which the beam bears most of the load, and a rigid-arch flexible beam bridge refers to a bridge in which the stiffness of the main arch is greater than that of the main girder and the main arch bears most of the load. Arch bridges with suspension rods currently in use, as shown in the attached figure 1 As shown in the figure, the design process is different from that of general girder bridges: for girder bridge structures, if the structural dimensions, materials, and static loads such as the second-stage dead load are all determined, the static load and intern...

AI Technical Summary

Problems solved by technology

[0012] In order to solve the above four problems in the prior art, the present invention provides a method and system for optimizing the design of an arch bridge with suspenders under moving loads, which can realize the bearing capacity of the bridge by considering the influence of moving loads during the design process of arch bridges with suspenders The comprehensive optimization of stability and stability takes into account both the strength safety factor and the stability safety factor of the bridge's main arch, and solves a better bridge suspender force, which makes the design result closer to the actual stability of the bridge and avoids the occurrence of the main arch The unreasonable design problem that the stability safety factor is much lower than the strength safety factor; at the same time, it avoids the difficulty of implementing the influence line analysis and the large amount of time required, and can adapt to change the optimization speed according to the load effect, taking into account both the optimization effect and the optimization speed balance, the arch bridge with suspenders designed by the method of the present invention has higher economic efficiency than the prior art, and can also be effectively applied in the large-scale suspension force optimization of long-span arch bridges

Images