Study On The Dynamic Interaction Analysis For The Earthquake-resistance Evaluation Of High-rise Tower Structure

The tower structure-base-foundation and water system is a complex dynamic interaction system. To meet the requirement of engineering design, a simplified lumped-mass model is established from the basic principle of structural mechanics method, in which the shears and flexures under horizontal shearing force and bending moment or the axial deformation under vertical loading are mainly considered. Comparing to the design method based on new technologies as finite element method in the present hydraulic (represented by the gravity dam) and high-rise structural anti-seismic design, this method is convenient and has a more extensive application scope. However, lots of dynamical factors are ignored due to the simplified lumped-mass mechanical model. Thus, the purpose of this dissertation is to study on the effects of complex factors on earthquake resistance of high-rise tower structure. Many researches are evolved in this paper, mainly including: the effects of foundation and dynamic water on the the simplified lumped-mass mechanical model, dynamic response analysis of finite element model, further study of the lumped parameter system, etc.1. Based on the simplified lumped-mass mechanical model for high-rise tower, this paper investigated a simplified model dealing with boundary conditions of foundation and dynamic water directly from the flexibility matrix, and laid a strong emphasis on the study and comparison of the dynamic response of the structure under three cases, namely, rigid foundation, Vogt elastic foundation and lumped-parameter model (included 10 parameters and 18 parameters).2. Moreover, on the basis of unbounded foundation model, a series of calculating cases were studied under different water levels, which was based on the following three different water pressure simplified models, namely, added mass method, Westergarrd model and Housner model, etc.3. The earthquake response of finite element model was also studied here. Together with further study of the lumped parameter system, including: The simulating of the three-dimensional infinite soil in ANSYS, the using of the simple and convenient Differential Evolution algorithm to identifying the parameters of the infinite lumped-parameter model to avoid some drawbacks. By having a particular comparison of the numerical results, the credible range of the structural safety analysis can be confirmed. The corresponding conclusions also offer gist to the necessary safety reservation. Furthermore, combined with practical engineering, and based on the simplified mechanical model, the article analyzed the seismic resistant capacity of the structure using the time domain dynamic method and discussed the complex dynamic interaction of structure-foundation-water system. This method has the advantage of poor computational complexity, can be easily accepted by engineers, it's also a symbol of the transition from the traditional simple design method to the new design method that considers complicate factors. The research work was considered to be important for developing the traditional structural mechanics design method and the process of the dynamical calculation.