Construction Process Simulation Of Giant Frame-core Tube-circular And Outrigger Truss Super High-rise Structure

Due to the continuous development of China’s economy and technology, super high-rise building is used more and more widely. Giant frame-core tube-circular and outrigger truss structure has been widely used in the super high-rise buildings and become one of the commonly used super high-rise structures. Normally, the study of super high-rise structure mainly focus on the mechanical properties and design methods, the study of the construction process of the structure is relatively less. However, super high-rise building has complex shape, long construction cycle and asks for high construction quality requirements, so simulation of the construction process of high-rise structure has been paid more and more attention and imperative.In this paper, set Nuo De Ying Lan international financial center project as the background, analysis the construction process simulation of the structure by the finite element analysis software SAP2000. Compare with effects of different factors on the structure construction process simulation results, analysis problems need to pay attention to in construction process, provide a useful reference for the construction of giant frame-core tube-circular and outrigger truss structure. This paper has mainly carried on the following works:1. Set up the finite element model by the finite element analysis software SAP2000 for the giant frame-core tube-circular and outrigger truss structure, and introduce and analysis the process of setting up the model of construction process simulation in detail, establish a complete construction process simulation modeling plan. Compared with the construction monitoring data to validate the correctness of the construction process simulation model, analyzes the causes of the error.2. Theoretical analysis the loading methods of construction process simulation. Using the finite element analysis model analysis giant frame-core tube-circular and outrigger truss structure in different loading methods, compare with the influence of vertical displacement of structure, the vertical displacement difference of structure and the vertical stress value of the core tube in different loading methods, analysis different loading modes on the structure construction process influence. The conclusion shows that, the precise construction process loading method is more close to the real situation, precise construction process loading method should be used in the construction process simulation.3. Theoretical analysis the necessity of core tube construction in advance, analysis the existing method of computing core tube leading construction layers. Simulate different core leading layers with the construction process, by compare with the change of vertical displacement of structure and the vertical stress value, find that core tube leading construction can effectively reduce the vertical displacement difference between different structures. And for the 64 layer of the high-rise structure, leading construction of 8-12 layer is more reasonable.4. Study on the reasonable truss connection order in construction through vertical displacement of structure by change the truss connection order; Study on effect of displacement of tower crane structure in vertical. The results showed that, for connect truss structure when finish, truss structure connection can coordinate the vertical displacement of the structure during the construction process, but it will produce a larger secondary force and need to pay attention to the stress problems of truss structure in the construction process; the impact of the tower crane structure vertical displacement is small, it can be simplified calculate in the simulation of construction.5. Analysis the influence of shrinkage and creep on structure, the calculation methods of shrinkage and creep coefficient through the theory and apply to the construction process simulation, considered creep and shrinkage factors in the simulation of construction process and quantitative analysis of the influence of creep and shrinkage factors on the structure of the construction process by compare with the vertical displacement of structure and the vertical stress value. Conclusions: in the analysis of construction process simulation, shrinkage and creep have a great influence on the giant frame-core tube-circular and outrigger truss structure, the construction process simulation should not ignore its impact, and should fully considered and reduce the influence of shrinkage and creep on construction process.