Arch bridge grid beam hoisting displacement control method with small construction disturbance

Abstract

The invention discloses an arch bridge grid beam hoisting displacement control method with small construction disturbance. The method comprises the steps of building a finite element model, and enabling the material characteristics, geometric characteristics and boundary conditions in the finite element model and external load informationto be consistent withcorresponding data of a design drawing,substituting the determined group of suspender initial tension into thebuilt finite element model to carry out normal installation analysis in a construction stage to obtain each initial value vector,and constructing a construction displacement control system, and substituting all parameters into the construction displacement control system to obtain final finished bridge gridbeam displacement. According to the method, the effect of small construction disturbance is achieved by controlling the minimum displacement change in the construction process, the displacement of the grid beam bridgingsegment meets the design requirement, and the result is reliable; the minimum and smooth displacement change of the control points of the grid beam in the construction process is guaranteed, the riskcaused by large deformation of the structure in construction is reduced, the construction efficiency is improved, and high-precision control over displacement in the construction process is achieved.

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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