Performance Based Designs And The Dynamic Reliability Analysis Of TMD/AMD For High-rise Structure

As an effective methods of structural vibration control, Passive/Active Tuned Mass Dampers (TMD/AMD) have been widely used in a great number of practical civil engineerings gradually. However, at present, there are some difficulties and deficiencies in theoretical analysis and engineering applications of TMD/AMD to be solved urgently, which would greatly constrain the further research and promotion of them. Based on this, in the engineering background of Guangzhou New TV Tower, according to the practical problemes encountered in design,calculation and implementation of the HMD device, a systematic in-depth study in the optimal design, theoretical calculation method, dynamic reliability and model test of TMD/AMD are conducted in this dissertation, taking into account the uncertainties of the actual structure. This is of great engineering significance in practical engineering application and further research of TMD/AMD control.The main research contentsof this dissertation are listed as follows1. A new optimal design method of TMD based on energy method was approached. First, a detail energy balance analysis of TMD/AMD is made, then based on the optimization criterion of minimizing the absorbed energy of the main structure during the earthquake, the optimal frequency ratio and optimal damp ratio of TMD are gained by nonlinear programming method, including the affect of the damping of the main structure, and the mathematics formula for corresponding parameter is formed by using the least square method. Furthermore, the influence relation between the parameters of TMD and the energy of the main structure are analyzed.2. The stochastic response analysis of the TMD/AMD-structure and the study on the damping properties of TMD with a kind of non-stationary random seismic excitation have been carried out. Based on the state-space expression of the dynamic differential equation of the TMD-structure, both the pseudo-excitation method and the precise integration method are applied to calculate the responses of the TMD-structure under the non-stationary random seismic excitation. This method can avoid the complicacies of complex mode method and the difficult in processing the non-stationary response, which is fast and accurate method in calculating the TMD-structure with non-stationary random seismic excitations. And a study on the damping properties of TMD is proceeded. Based on the first-passage failure theory, the comtrast analysis between the structure with/w.o TMD by using the reliability index with the boundary of the maximum story drift angle is made.3. The random wind-induced response of TMD-structure has been made. Firstly, the conventional random vibration methods would be very difficult to calculate the complex high-rise structure with multiple-points excitations because of the low efficiency and high complexity, a highly efficient random vibration algorithm, the pseudo-excitation method (PEM), is developed for the random response analysis of of the complex high-rise structures. Secondly, the space of the high-rise tower structure is very inadequate in practical engineering application and the stroke of the TMD device is always limited in real design, so the wind-resistant dynamic reliability of TMD with limited spacing under different returning periods of wind loads is conducted in this paper. First, the random multiple-point wind-induced responses of TMD-structure are calculated. Then, based on First Excursion Failure Criterion, the wind-resistant dynamic reliabilities of TMD shock absorber within an acceptable level of TMD stroke are investigated under different returning periods of wind loads, which can give a good selection of the TMD parameters and conduct the limited design of the TMD control device.4. Considering the uncertainties of practical civil engineering structures, the Neural Network Response Surface Method optimized by Genetic Optimization Algorithm has been proposed to calculate the dynamic reliability of stochastic structure with AMD/ MTMD. This method has both of the advantages of Neural Network Response Surface Method and the global search of GA, which can approach to optimum solution accurately of the performance function. And the iteration steps of JC method can be reduced effectively. Furthermore, a contrast analysis of the dynamic reliability of stochastic structure with TMD and MTMD is made. The results show that the MTMD can greatly improve the dynamic reliability than TMD for the stochastic structure.5. Simulated shaking table test of TMD/AMD. Experimental researches on the characteristics of TMD/AMD devices and the AMD Linear Motor system which is popular used at the present are conducted; then, the energy balance theory of TMD/AMD system is verified according to the energy analysis of the test results, and the control effectivenesses of TMD/AMD based on energy performance index were evaluated. Lastly, combination with the actual engineering, and based on first passage failure criterion, the dynamic reliability analysis for the main structure and the TMD with limited spacing were carried out accordingly.6. The composition of the life-cycle cost (LCC) of TMD control device is analyzed and an optimal design method for TMD /AMD device is proposed based on cost-effectiveness criterion. Firstly, the life-cycle costs and control effectiveness of the TMD system with different mass ratios are calculated, respectively; then, an analysis of the effectiveness-cost ratio of the TMD device is carried out. On the premise of meeting the specific performance requirements of the owners, the optimal parameters of the TMD system are obtained by using the performance index of the effectiveness-cost ratio, and the best control performance will be achieved with a low cost and the resources will be saved greatly. Moreover, the LCC and the effectiveness-cost ratio of the control device are proposed, which can make a good evaluation on the effectiveness, economy and reliability of different vibration control strategies...