Analysis on the Influence of Ambient Temperature on Integral Lifting Construction Technology for High-Rise Connected Structure

The construction process is an important stage to ensure the reliable performance of the structure and to meet the quality standards. With the development of social economy, the requirements for construction quality are gradually improved. Ambient temperature is the key factor which affects the construction accuracy and maintains the construction quality. It is widely concerned in long-span structures judge the influence of temperature difference on the additional stress of the structure. For the lifting stage of Yunmen steel structure, the analysis results show that when the ambient temperature at the time of lifting is 27. 6 ℃ lower than during assembly, the amount of misalignment between the connected structure and the tower is the lowest. The temperature difference is too large to occur in the real environment. It can be seen that with the decrease of the ambient temperature, the amount of misalignment between the connected structure and the tower during lifting decreases, which is conducive to the construction accuracy assurance. Therefore, it is recommended that the docking should be carried out early in the morning or late afternoon as much as possible. such as railways and bridges, but there is less research in the construction stage of building structures. With the increasing complexity of building structure design and the increasing structure dimension, the impact of ambient temperature on construction begins to appear. Therefore, based on the integral lifting technology, which is widely applied in high-rise connected structures, this paper discusses the influence of ambient temperature on the two important construction process, assembling and lifting stage. In the assembly stage, the connected structure is constrained by the tire frame and support frame, so that it produces additional internal forces and deformation under the action of temperature. The structure of the supporting measures are considered under two extreme conditions: minimal horizontal constraint and rigid connection. In the lifting stage, the connected structure has no horizontal constraint and can be freely deformed in the horizontal direction, which will significantly affect the influence of the connected structure docking accuracy with the tower structure at high altitude. In this paper, the temperature deformation and construction deformation are superimposed and it is proposed to comprehensively consider the influence of the temperature deformation and the construction deformation on the lifting accuracy of connected structure. In the specific analysis, based on the finite element simulation, the relationship between the deformation of the key linking point and the temperature is obtained by linear fitting. The relationship between the temperature and the amount of docking is further calculated, so as to obtain the temperature difference with the smallest misunderstanding. Therefor time schedule of the lifting construction with this temperature difference could be guided. After that, taking Hangzhou Yunmen steel structure project as an example, the influence of ambient temperature in the project was analyzed. If the horizontal constraint of the tire frame is not considered in the assembly stage, the additional stress of the ambient temperature on the structure is small. On the contrary, it will cause greater additional stress, even more than the yield stress of the steel. The calculation result is based on the calculation in extreme cases, which means the temperature difference changes greatly and the constraint is strong. The probability of actual engineering conditions is low. Therefore, it is suggested that in the stress analysis, reasonable temperature difference and boundary conditions should be selected for analysis according to the real environment of the project and the use of measures, so as to