Displacement control method for hoisting lattice girders of arch bridge with small construction disturbance

Abstract

The invention discloses a lifting displacement control method of an arch bridge lattice girder with little construction disturbance. By establishing a finite element model, the material properties, geometric properties, boundary conditions and external load information in the finite element model should be consistent with the corresponding data in the design drawings Consistent; Substituting a determined set of suspender initial tension into the built finite element model for formal analysis at the construction stage to obtain each initial value vector; establishing a construction displacement control system, substituting each parameter into the construction displacement control system to obtain the final bridge grid beam displacement. The method proposed by the invention achieves the effect of small construction disturbance by controlling the minimum displacement change in the construction process, and realizes that the displacement of the lattice girder bridge segment meets the design requirements, and the result is reliable; it ensures that the displacement change of the control point of the lattice girder is minimal during the construction process. Smooth, reducing the risk of large structural deformation during construction, improving construction efficiency, and realizing high-precision control of displacement during construction.

Description

technical field [0001] The invention relates to the technical field of transportation bridge and culvert engineering, in particular to a method for controlling the hoisting displacement of an arch bridge lattice girder with little construction disturbance. Background technique [0002] Arch bridge is a bridge structure type that is widely used on highways in my country and has a long history, especially in Guangxi. , better technology, better calculation methods, and newer control concepts. Long-span arch bridges are becoming more and more popular due to their advantages of low cost, fast construction, cheap maintenance, reasonable force, and strong durability. For arch bridges, in order to ensure good quality, displacement control during the construction process of hoisting lattice girders is even more important. The key point is that during the construction process, the displacement of the lattice girder changes too much and too frequently, which will cause relatively larg...

AI Technical Summary

Problems solved by technology

Long-span arch bridges are becoming more and more popular due to their advantages of low cost, fast construction, cheap maintenance, reasonable force, and strong durability. For arch bridges to ensure good quality, displacement control during the construction process of hoisting lattice girders is even more important. The key point is that during the construction process, the amplitude of the displacement of the lattice girder is too large and too frequent, which will bring relatively large disturbances to the structure and increase fatigue damage. It is also difficult to adjust the line shape through secondary cable adjustment to achieve the desired effect. The quality of the bridge line shape will affect the appearance, driving comfort and overall force of the bridge. The abrupt line shape of the bridge surface will cause driving vehicles Additional impact effect, long-term additional impact load on the boom will shorten the fatigue life

Many accidents at home and abroad have caused car crashes and fatal accidents due to the damage of booms, which have brought serious economic losses and caused bad social impact.

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