Research On Construction Simulation And Site Monitoring Of The High-rise Oblique Grid-concrete Core-tube Hybrid Structure

With the rapid economic development,the construction industry has also undergone enormous changes.The building structure is gradually showing super high,super large and complex structure characteristics.More high-rise super building structure adopts steel frame-concrete core barrel mixed structure.With the development of building height,the vertical deformation and its difference have more and more obvious influence on the structure.The resulting structural residual stress and floor cracking are also increasing.Structural vertical deformation has become a non-negligible problem for super high-rise structures.Therefore,it is necessary to carry out construction simulation and on-site monitoring of high-rise super high-rise building structures.Based on the research background of Shenzhen Xintong building project,This paper carries out the construction simulation analysis and the stress strain monitoring of the construction process of the key stress components.During the construction simulation analysis,considering the different loading methods,the time denaturation of concrete,the change of construction speed,the advance construction of the core tube and the displacement of the wall column after the completion of the construction.The main research contents and research results obtained are as follows:Firstly,The vertical displacement of the floor is larger and the upper layer reaches the maximum.During the construction,the vertical displacement of the floor is shown to be large in the middle floor,and the"fish belly"is small in the bottom and top.Considering the time-varying characteristics of the material,the elastic deformation of the core tube is the largest,the creep deformation is the second,and the shrinkage deformation is the smallest.With the increase of the floor,the total deformation ratio of elastic deformation decreased.The more the core tube leads the outer frame,the larger the vertical displacement of the core tube is,and the vertical displacement of the outer frame becomes smaller.The influence of the external frame column of floor living load is larger than that of the core barrel.During the first five years after completion,the vertical deformation of the core tube develops very rapidly,and the vertical deformation of the outer frame has almost no effect.Secondly,Chang the construction speed,leading the construction of the core barrel and considering the time-varying characteristics of the material,there is no significant influence on the internal forces of the core barrel and the outer frame columns.When the constructional live load increased to 5kN/m~2,The maximum stress of frame column and core tube is86.65MPa and 11.06MPa,which is less than the material design strength.Twenty years after the completion of the construction,the internal force of the wall column is far less than the design strength value of the material,and it has a high safety reserve.The actual monitoring data and the simulated data are compared and analyzed through the second and the twelfth part of the monitoring.The overall development trend is the same,the wall strain error is controlled within 50%,and the column strain error is controlled within 15%.Thirdly,Article summarizes the vertical displacement control of high-rise super-hi gh-rise building structures from materials,structural design,construction techniques,an d on-site monitoring during construction,effectively reducing problems caused by poor vertical deformation.