Research On Torsion Effect And Design Of Limited-beyond High-rise Building

With the development of economy and the progress of technology, the development speed of tall building structures increases year by year, the height is increasing continuously, the function and the style are becoming complex more and more, the structural systems are becoming more various. The various structural systems have the emblematical behaviors and the corresponding methods, the concerned problems are also different during the design. It is necessary to quantificationally analyze the parameter critical value of the different structural systems. During the practical engineering, it is wish to obtain the maximum stiffness and the best structural behaviors based on the limited material dosage, which is involved the structural reasonable stiffness and reasonable arrangement of elements. At the same time, when the plane arrangement or the shear wall is complex and asymmetry, the tall building structures not only have the parallel move, but also the torsion around their stiffness center. It is shown from the seismic disaster that torsion effect is a very important factor to harm the tall building structures. In this paper, carried out several concrete research taking a high-rise building of Wuhan as the project example, the key problems as follows:1, First the torsion calculation method of high-rise building is studied, considering torsional stiffness of member through parameter theoretical analysis. Investigated the main influencing factor of the torsional stiffness. Proposed the method and measure to reduced structure torsional effect.2, The analysis of dynamic characteristics and response of a transfinite high-rise building of pure shearing wall structure, under different earthquake is given in this paper. A tall building model was tested to simulate the earthquake on shaking table, in the events of different earthquake intensity to show acceleration, displacement and deformation response on the form of structural damage and destruction mechanism. Some suggestions on aseismic design also have been given.3, A 3-D finite element model was established according to the practical size of the structure. Frequency; cycle; effect of torsion.and features of vibration were obtained and studied by doing modal analysis.4, History analysis method was taken to obtain the seismic response in main direction together with each story deformation. The model responses of acceleration, deformation, strain and torsional characteristic under different earthquakes have been measured. The main factors effecting on dynamic response of torsional vibration are analysed. The results show that the more intense the seismic wave is, the bigger is the dynamic response of the buildings. Some suggestions on aseismic design considering the response of torsional vibration are presented.