| The integral lifting steel platform formwork structure is a generation of products that emerged with the rise of super high-rise buildings.Compared to traditional construction scaffolding,it has many advantages such as large bearing capacity,fast construction speed,high safety performance,high mechanization,multiple turnover times,no height restrictions,and labor saving.Due to the relatively late development of China’s construction industry compared to foreign countries,our progress in the construction formwork system has also been relatively slow,which has led to multiple safety accidents of formwork collapse in recent years.Therefore,this article takes the construction of a commercial center in Ningbo,Zhejiang Province(Manhattan project)as the research background.Through literature research and research analysis,three types of integral lifting steel platform formwork systems were compared to determine the suitable lifting plan for this project.The construction plan layout of the framework under this plan was introduced,and the bearing mode and stress position of the entire framework were understood,completing a preliminary understanding of the framework.Then,by using Midas Gen structural analysis software to analyze the stress situation of the overall lifting steel platform formwork structure in working,lifting,and shutdown states,it was found that the strength and stiffness of the three meet the requirements of the specifications,and it was found that wind load has a significant impact on the structure.In the analysis of wind load anti overturning,due to the regulations that construction operations should not be carried out when the wind speed is greater than or equal to 32m/s,the structure is analyzed using shutdown conditions,and it is stipulated that when the reaction force at the support generates a turning or stress exceeds the limit,it is considered that the frame has overturned.According to the analysis,it was found that when the wind pressure reached 2.44 k N/m2,the entire frame reached an overturned state.Therefore,in actual construction projects,construction should be strictly carried out in accordance with the specifications,and in case of strong wind weather,the frame should be pre tensioned.In stability analysis,by comparing the results of linear and nonlinear stability analysis,it can be known that the impact of initial defects on the structure cannot be ignored in actual design calculations.By calculating the stability of a single column,both its limb and overall meet the requirements of the specification.Subsequently,based on the calculation laws of relevant mechanical theories,the strength,stiffness,stability,and steel consumption of steel platform structures with different support quantities were comprehensively compared,and it was determined that the eight column support system was the most economically optimal type.Finally,according to the experiment of local components,the parts prone to deformation and damage were found,and ABAQUS finite element analysis software was used for simulation and comparison to verify the rationality of software calculation.At the same time,the software was used for mechanical simulation analysis of the overall single support system,and the Control variates was used to strengthen the optimization analysis of the weak points generated by the initial simulation results,and finally the components meeting the requirements of the design specifications were obtained,This has laid the foundation for the research and development of the integral jacking steel platform formwork structure,provided guiding opinions for practical engineering applications,and also laid the groundwork for China’s formwork technology to go global. |
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