Analysis Of Core-tube Structures Subjected To Torsion

In the paper, In accordance with problem that core-tube structure in high-rise buildings subjected to torsion, there is a systematical analysis and comparison based on the FEM to compute the table flap shell. According to the precision of some theory that in common uses of in engineering are too bad, and a new method for concentrated-stress. So the following severa] aspects of research are completed:(1)According to the core-tube structures of open section, Vlasov theory is in common use in engineering. There is an analysis and comparison about Vlasov theory. The results indicate a higher computational accuracy.(2)According to the restrained torsion of braced thin-walled open section. Take into account the effect of the brace, the results indicated a significant increase in restrained torsion of the braced thin-walled open section by the presence of braces. Take into account the effect of the channel lips, the results indicated a significant increase in restrained torsion of the side walls is restrained by the presence of channel lips. So the theoretical model is based on Non-groove shape section. The continuous theory is in common use in engineering. There is an analysis and comparison about the continuous theory. The results indicate a lower computational accuracy with regard to the Max warping stress and the Max rotation about the shear center. So two modification formulas are established to modify the Max warping stress and the Max rotation about the shear center. The validity and the practicability of the modification formula are validated by lots of classic examples.(3)A new method for concentrated-stress is developed based on the continuous theory. The validity and the practicability of the modification formula are validated by lots of classic examples.