Study On Construction Simulation And Site Monitoring Of Super High-rise Suspended Steel Structure Building

With the booming development of modern science and technology and the continuous growth of economic strength in China,people’s pursuit of higher level of building shape and use function has been rapidly growing over last several decades.Thus,increasing amount of super high-rise steel structure buildings with novel shapes,unique styles and complex forms have emerged,leading greater challenges to the modern construction industry.As the introduction of cantilever suspension structure in super high-rise buildings could achieve a trade-off between the current situation of land shortage and the demand of expansion space,it has become a research hotspot in the field of super-tall buildings.However,there are few researches on the simulation and monitoring analysis of the whole construction process of super high-rise suspended steel structures and the pre-deformation adjustment of high-rise steel structures.In addition,more attentions should also be paid to the issue on the unloading of temporary steel structure support system.This article introduces the numerical analysis method of mechanics for simulation of construction process discusses the calculation methods of cumulative vertical deformation,construction leveling amount and reserved value of vertical components in the construction stage of floor vertical components,and analyzes the influence of load application sequence on cumulative vertical deformation law of floor vertical components.The above analysis provides theoretical basis for structural examples and the study of pre-deformation of steel structures.Then,taking a super high-rise braced frame tube suspension steel structure as an example,the finite element model is established by MIDAS/GEN,and the rationality of the example structure finite element model is evaluated by the comparison with the natural vibration period index that can reflect the dynamic characteristics of the structure.In addition,through the analysis of the mechanical characteristics of the structural system,it is clear that the cantilevered outer frame and its suspenders and truss layer diagonal braces are the key parts of the structure.This article studies the deformation and internal force of super high-rise suspended steel structure building.In order to explore the three-dimensional pre deformation adjustment of super high-rise steel structure construction site,the influence of different construction sequence,concrete shrinkage and creep,construction leveling adjustment and other factors on the vertical deformation of core tube have been clearly analyzed.And the horizontal displacement of concrete-filled steel tubular column in the construction stage has also been discussed.Besides,the paper further puts forward the construction leveling amount and the pre adjustment amount of vertical components.At the same time,the influence of the floor stiffness at different positions of the cantilever frame on its vertical deformation and the vertical deformation of the hanging column are also discussed.The reasonable sequence of floor pouring is obtained the optimization of through simulation,and the rationality of simulation is verified by comparing the measured settlement value with the simulation value.Finally,a detailed study of the unloading sequence of the temporary support of the super high-rise suspended steel structure was carried out,focusing on the influence of the different unloading sequences of the temporary supporting frame group on the deformation of the outer cantilever frame and the change of the internal force of the key components.The optimized unloading sequence is applied to practical situation,and the measured unloading data of on-site monitoring is collected and compared with the simulated value,and the rationality of the unloading sequence is further analyzed and discussed as a reference for similar projects.