Study On Analysis Method And Regulation Of Internal Forces Of Frame-tube Structures Caused By Axial Deformation Difference

Because the limite on axial compression ratio of column and wall are different, the axial deformation of them must be different in tall-building construction.When consider the creep and shrinkage of concrete, with the level number increasing, the difference of axial deformation will be enlarging. The axial deformation difference between columns and walls in frame-tube is obviouser than other constructions, Because of the constructions stress'character. The internal force redistribution in statically indeterminate structures will be created by axial deformation difference, and the stress performance of structure would be changed. At present, there is no define of calculating about this aspect in code, it need to farther research.By establishing classical Frame-Tube structure 3D model, the axial deformation and internal force in different constructon simulating way have been analysed in this paper.The models whose arrangement of structue plan are not changed, with different level numbers, axial compression ratios, link-beam cross sections have been calculated in the conditions of only considering vertical load and combining the seismos.The influence laws of creep and shrinkage to axial deformation difference and internal force are also have been researched. By the theory deducing and numeric analyzing of model, the main conclusions are as follows:â‘ The method of simulating the construction process which chang the stiffness and load with the floors adding, is conform the practical situation. It is the frist choice of analyzing internal forces of high-building when considering the different axial deformations; the structural analysis under complete loading is not adapt to high-buildings; the method of simulating the construction process which establish the stiffness at one time and load with the floors adding, can be used to calculate the axial deformations and internal forces in some conditions, but the moment of link-beam and column in frame-tube whose level number is large and the protected earthquake intensity is low, should be checked.â‘¡The difference of axial compression ratios between columns and walls is the ultimate reason of the difference of axial deformation. The degree of deformation difference is relating to the level number.The axial deformation difference in frame-bube is large in middle floors, and it is small in bottom and top floors, the distribute law of it is like para-curve.When consideing the deformation difference, the...