Research On Simulation Analysis And Construction Control Of Special-Shaped Cable-Stayed Bridge With Steel Arch Tower

In order to meet the traffic function and people’s pursuit of aesthetic higher level,the special-shaped cable-stayed bridge is borm.This paper takes the Yongding River Bridge as the background which is an inclined steel arch tower cable-stayed bridge with non-plane torsion and variable section based on the full 4D BIM construction management platform.To obtains the construction control method and solution of the special-shaped steel arch tower,this paper studies the reasonable construction state of the super-static steel arch tower of the special-shaped cable-stayed bridge,taking the reasonable bridge state as the research goal,combined with slicing method and splitting method,The main research contents and achievements are as follows:(1)Combining the structure and construction characteristics of the bridge Tower of this project,this paper expounds the importance of precision simulation analysis and efficient construction control method of special-shaped steel arch tower to guide construction and manufacture,and puts forward the method of data conversion of BIM software to finite element software-slicing method,which is quickly modeled while preventing the singularity of plate and Shell element Division.(2)The finite element model of bridge tower-bracket system is established by slicing method,and the strength and stability of the bracket are calculated,and its safety is verified.Aiming at the key and difficult points of construction process simulation,this paper is concluded that the cantilever construction Angle makes the cantilever displacement of the.bridge tower more accurate..(3)Based on the linear basic theory and displacement accumulation method of planar cantilever,this paper deduces the relationship between the fabrication and construction of the spatial torsion inclined bridge tower,the calculation formula as well as the length adjustment.In order to make a comparative analysis of the two models,one is the profiled integral bridge tower and the other is the unclosed bridge tower,this paper adopts the forward installation method and the reverse demolition method.And it is concluded that as long as the influence of closing section error is controlled,the exact alignment of bridge tower can be guaranteed.(4)This paper puts forward a new method of construction control of special-shaped bridge tower-splitting method,and analyzes the influence of pre-deformation and bracket on bridge tower construction.It is concluded that the combination of pre-deformation and support can ensure the bridge tower to close smoothly and meet the requirements of design line.In addition,this paper also verifies the feasibility and accuracy of splitting method.(5)Considering the influence of pre-deformation and support,this paper uses splitting method to calculate the bridge tower-support system,and obtains the manufacturing alignment,construction alignment as well as section machining adjustment of the bridge tower system.Besides,this paper verifies the linear and stress of bridge tower to meet the requirements of standard precision,which can better guide the manufacture and construction of this project.(6)The Extremum error method is used to analyze the construction error of bridge tower section and axis deformation,and the construction displacement deviation caused by the upper and lower fluctuation of bridge tower is studied.So it is concluded that the cross section and axis deformation have great influence on the construction linearity,and the system is insensitive to quality and stiffness,Finally the special position and solving measures need to be controlled in the construction process...