Performance Study Of Dispersive Tube Structure

The dispersive tube structure is a new type of high-rise building structure. The constructure form of the dispersive tube structure is simple, and it can be arranged flexibly. The vertical distribution of lateral stiffness is uniform, and the utilization of the construction area is improved. Dispersive tube structure is composed of small size tubes, beams and floors. Beams and floors are for withstanding vertical load, and those tubes linked by beams and floors are served as supporting members and lateral resistant members.A systematic, in-depth study of the dispersive tube structure using the finite element program aimed at the structure's static performance, dynamic characteristics, and seismic performance is carried out in this paper:1. A fairly reseach of the static performance of dispersive concrete tube structure system under vertical load and horizontal wind load and comparison of the calculated results between the dispersive tube structure and the frame-corewall structure is made, which indicates the advantages of dispersive concrete tube structure;2. Two programs are adopted to make the modal analysis of dispersive tube structure model. A comparative analysis of the calculated results difference between the two programs (SATWE and ETABS) is made, and a preliminary discuss of the reasons of different calculation results is conducted through the research of their computational theory;3. A comparison of seismic performance of the two forms of structure is made. The mode-superposition response spectrum method and elastic time histroy analysis method are used to study the seismic properties of the dispersive concrete tube structure model and the frame-corewall structure model.4. A tentative calculation of a ultralimit structure model aims at the dispersive concrete tube structure system is conducted in this thesis. And a preliminary investigation is carried out to explore the feasibility of the application of dispersive concrete tube structure system in ultralimit structure.The following conclusions are deduced in this thesis:1. The structure static performance of dispersive concrete tube structure system is quite well under vertical load and horizontal wind load. the maximum principal stress of dispersive concrete tube structure system was found at the leeward side wall of underlying structure under the capacity limit, and the stress meet the requirements o"fCode for design of concrete structures of China". The top displacement and story drift also meet the requirement of corresponding norms under the operating mode that includes wind load in the serviceability limit state.2. Under frequently earthquake load, the torsional effect of the structure is not obvious. And the elastic deformation, stability and shear-weight ratio of the structure all meet the requirements of the code. The distribution of floor displacement is uniform, and the maximum floor displacement occurred in the central part of the structure.3. The period of dispersive concrete tube structure system is shorter than that of frame-corewall structure in the circumstance of using roughly the same amount of concrete and utilization area. Hence comes the conclusion that structural stiffness of dispersive concrete tube structure system is larger than that of frame-corewall structure. Under seismic load, the lateral displacement of dispersive tube structure is less than that of frame-corewall structure , although both of them all meets the requirements of related code. The height of dispersive tube structure could be made much higher than that of frame-corewall structure.4. Based on the comparison analysis of between dispersive tube structure and frame-corewall structure, in which the same amount of concrete are used and the same area of the building are reached, the anti-lateral sway performance of the dispersive tube structure is better than that of the frame-corewall structure .5. The mass of the structure calculated by SATWE program is slightly larger than by ETABS, so the period via modal analysis calculation is larger than the result from ETABS. The mass of the structure calculated by ETABS is closer to the actual situation, so the ETABS program is recommended to analysis the dispersive tube structure .6. The calculation result of mode-superposition response spectrum method indicates that the ultralimit high-rise buildings that adopt dispersive concrete tube structure system under the seismic load of the aseismatic design of region of 7 intensity for both the ultimate limit states and serviceability limit states could meet the requirements of related codes.