Research On Displacement Tracking And Temperature Influence Mechanism Of Super High-rise Roof Steel Structure During Construction

This paper mainly studies the change law of the top steel structure displacement of the super high-rise building during the construction phase.Using theoretical analysis,numerical simulation,field test and other methods,the relationship between the reference value of the temperature difference displacement index and the change of the structure top boundary condition during the construction process is explored.At the same time,through the establishment of a multi-time and multi-sour ce monitoring platform to monitor the response of the super high-rise top steel structure during construction,the wind,temperature,tower crane load and construct ion displacement during the construction of the super high-rise top steel structure are obtained,and the construction environmental factors are quantified for the impact of construction displacement in the super high-rise top steel structure.A method of steel structure construction displacement prediction based on flexibility correction is proposed,and support vector machine is used to predict the displacement of super high-rise steel structure at the top of the construction stage to improve construct ion and installation accuracy.Using theoretical derivation to establish the relationship between the reference value of temperature difference and displacement of steel frame structure and construction boundary conditions.In this paper,the static analysis method is used to derive the reference value formula of the temperature difference displacement under the change of the boundary conditions of the typical construction conditions.It is found that the change of the construction boundary conditions of the steel frame structure under the action of temperature causes the change of the reference value of the temperature difference displacement of the column.A multi-time and multi-source monitoring platform was built and the influence of construction environmental factors on the construction displacement of the super high-rise top steel structure was studied.This paper uses a multi-time and mult isource monitoring platform to monitor the response of the super high-rise top steel structure during construction,and obtains the wind,temperature,tower crane load and construction displacement during the construction of the super high-rise top steel structure,and quantifies the impact of construction environmental factors on the construction displacement of the super high-rise top steel structure Impact.Through correlation analysis,it is found that when the external curtain wall is not installed,the normal wind is not the main factor affecting the construction displacement of the super high-rise top steel structure.Temperature and tower crane load are the main factors affecting the construction displacement of the steel structure.The finite element model of Gemdale Parkway was revised with the value of the measured data and numerical simulation research was carried out.In this paper,the method of static correction is used to amend the finite element numerical model of Gemdale Parkway,thereby obtaining a finite element model that is closer to the measured structure,and verifying that the steel frame structure is under the effect of temperature,and the change of the construction boundary conditions causes the column change in the reference value of the temperature difference.A prediction method of steel structure construction displacement based on flexibility correction is proposed.In this paper,the support vector machine that introduces the flexibility coefficient index not only accurately predicts the overall change trend of the next stage of the construction displacement of the super high-rise top steel structure,but also accurately predicts the maximum and minimum values of the construction displacement to ensure that the steel structure is in the construct ion process Installation accuracy and safety.