Safety Performance Analysis Of High-rise Frame Shear Wall Structure During Construction

With the increase of population in China,people’s demand for housing is increasing day by day.High-rise frame-shear wall structure has become the most popular mode of commercial and residential buildings in China.While building high-rise frame shear wall structure vigorously,it also exposes many safety problems in the construction process.This paper studies the structure of high-rise frame shear wall,considering the influence of concrete shrinkage and creep and construction loading mode on the structure under different working conditions in the construction stage.Taking the high-rise frame shear wall structure as the research object,this paper studies the safety and reliability of several important construction joints under the influence of external loads,and whether the structure itself and scaffolding ancillary works are safe and reliable under the influence of external loads.In order to reveal the influence of construction process on the seismic performance of high-rise frame-shear wall structure,a three-dimensional solid model was established by MIDAS/GEN finite element software to simulate the construction of the complex high-rise structure,and the effects of one-time loading calculation and construction simulation calculation were compared,and the shrinkage and creep of concrete were considered.The distribution law of deformation,deformation difference and internal force of force wall structure during construction and completion of construction are studied.Response spectrum analysis and time history analysis are used to study the seismic performance of structure during construction.The main contents of this paper are as follows:1.During the construction of high-rise buildings,the axial force and stress at the end of columns decrease with the increase of the height of stories.When the exact loading method is adopted,the other internal forces and displacements of the structure increase first and then decrease with the increase of the height of the floor,and the maximum value appears in the middle floor of the structure.When the one-time loading method is adopted,the other internal forces and displacements of the structure increase with the increase of floor position,and the maximum value appears on the top floor of the structure.In the lower part of the structure,the bending moment of the beam and column ends obtained by the exact loading method and the one-time loading method are basically the same;in the upper part of the structure,the bending moment of the one-time loading method is getting larger and larger,which is much higher than the exact loading method.2.Comparing the calculation results of the one-time loading method and the exact loading method,it can be seen that there are some differences in the bending moment at the end of the column,the axial force at the bottom of the column,the stress at the bottom of the column and the bending moment at the end of the beam.For the moment at the bottom and top of the column of the same layer,the difference of moment calculated by the exact loading method is larger than that calculated by the one-time loading method.For the whole structure,the effect of one-time loading method on the bending moment at the bottom of column is greater than that at the top of column;in the upper part of the structure,the calculation results of one-time loading method differ greatly from those of accurate loading method,with the bending moment at the bottom and top of column reaching 30% and the axial force near the bottom of column reaching 30%.3.When the exact loading method is used,the vertical displacement of column and shear wall increases first and then decreases with the increase of floor,and the maximum value is obtained in the middle of the structure: the maximum vertical displacement of Z1 column appears on the 22 nd floor,9.006 mm,and the maximum displacement of Q1 wall appears on the 22 nd floor,8.81 mm.When the first loading method is used,the vertical displacement increases with the increase of the floor,which leads to the larger displacement of the upper part of the structure.The maximum vertical displacement of Z1 column appears on the top floor,which is 18.38 mm.The maximum displacement of Q1 wall also appears on the top floor,which is 18.19 mm.4.The response spectrum analysis of frame-shear wall in construction shows that the bending moment at the end of beam and column first increases and then decreases with the increase of floor,and the bending moment at the end of beam and column of the middle floor is larger than that of the bottom and top floor.The axial force and bending moment of column bottom decrease with the increase of floor.The change trend of the internal force of the structure in the vertical direction of the one-time loading method is consistent with that of the exact loading method,but the bending moment and displacement at the end of the beam and column of the top floor will be enlarged.Under the action of frequent seismic response spectrum,the maximum horizontal displacement of Z1 column in X direction appears on the top floor of the structure when the precise loading method is used to simulate the construction.The one-time loading method can simulate the earthquake action in the construction of high-rise buildings,and the upper error of the structure will become larger and larger.5.In the course of construction,under the action of frequent earthquake time history,the moment of column end and beam end,the vertical displacement and the maximum displacement between floors increase first and then decrease with the increase of floors.Generally,the maximum value will appear on the middle floor of the built structure.The axial force and stress at the bottom of the column decrease with the increase of the floor.The vertical displacement of each floor of the structure will increase with the progress of construction.