Seismic Control Optimum Design And Experimental Research Of Base Isolation And "Adding Story And Seismic Decrease" Structures

At present, the base-isolation structures and the "adding story and seismic decrease" structures (the TMD seismic decrease structures) are gradually applying in the projects. In the action of dynamic load (e.g. earthquake and wind), because of the damping matrixes of the two structures' motion equations are both non-classical, the dynamic equation can't be decoupled by the traditional real-mode analysis (the mode-superposition method). Though, in this thesis the complex-mode analysis is used to solve the stationary and non-stationary random earthquake response of structures and their analytic expressions are got. On the basis of these expressions, the optimal parameters of the two structures' isolation & seismic decrease equipment are analyzed. In addition to prove the correctness of those optimal parameters, a large-scale shaking table model testing with TMD seismic decrease equipment is conducted. Through the testing a conclusion can be achieved that those parameters we putted are right by analyzing the testing results. The thesis includes the following content:1, For a 2-DOF second-order dynamic system that the damping is non-classical and the structure is non-symmetrical, the stationary and non-stationary random earthquake response and the dynamic reliability of the system are got by the use of the complex-mode analysis method.2, In the action of earthquake, for the base-isolation structures and the "adding story and seismic decrease" structures (the TMD seismic decrease structures), the response of the upper structure of the base-isolation structure and the main structure of the "adding story and seismic decrease" structures (the TMD seismic decrease structures) is mainly the response of the first-mode. So, only considering the first-mode response and including the isolation & seismic decrease equipment, then the system become a 2-DOF and second-order dynamic system that the damping is non-classical and the structure is non-symmetrical. Using the above method, the analytic expressions of response and dynamic reliability are got.3, On the basis of the above analytic expressions, taking the isolation or seismicdecrease coefficient (the ratio of the standard deviation of the response of structures) as the optimal objective function, the parameters of the isolation and seismic decrease equipment are optimized. An optimal design method and some useful data are achieved and it can be used in the practical project.4, For the above optimal parameters, a large-scale shaking table model testing of the TMD seismic decrease structure using the EL Centra earthquake wave and an artificial earthquake wave (RGB) simulated by the trigonometric progression method is conducted. The above theories are approved through the analysis of the testing results.5, Under the dynamic reliability constraint of isolation or seismic decrease equipment, taking the mean largest displacement of the main structure as the objective function, an optimal method of the base-isolation structure and the "adding story and seismic decrease" structure (the TMD seismic decrease structure) is brought forward by using the penalty function method to solve the optimal isolation and seismic parameters.