Research On Dynamic Reliability And Damping Control Theory Of High-rise Connection Structure

There are lots of research results on dynamic properties and given seismic responses of high-rise connected structure, which are more dependent on the selected ground motion characteristics and known subjects are given, so that the research result on high-rise connected structure have more dispersion in the application, and full characteristics of the connected structure are known and grasp are difficult by designers. On the one hand, the unified standard for reliability design of engineering structures indication: the reliability analysis should be used in building structures design, but the research results is less for reference on high-rise connected structure, on the other hand, based on traditional seismic performance requirements have changed greatly on building, proposed and actively promote the development of structural vibration control technology, the research results is rarely on active and intelligent damping vibration control too. Based on the above discussion, systematic research on dynamic reliability and damping control theory of high-rise connection structure from 6 aspects.1. Seismic response parametric study on high-rise connected structure. The adjacent structure period ratio was used explanted the asymmetry of connected structure, and the connector coordination ability for tower through the connector stiffness change was reflected, the dynamic characteristics and seismic response is discussed in detail through a numerical example under different period ratio and connector stiffness.2. The stationary random seismic response analysis on tall connected structure. The earthquake ground motion often stationary under the strong earthquake, the modified filtered white noise stochastic earthquake ground motion model is use by Clough and Penzien proposed, the stationary random seismic response of the tall connected structure was solved with the combination of state space analysis method and the pseudo excitation method, directly power spectral density method was use analysis the stationary random seismic response of tall connected structure under frequent and rare earthquake, and the stiffness degradation of Bouc-Wen model are used to simulate the hysteresis of the connected structure under rare earthquake, and Monte Carlo random sampling method are also used to compare the study conclusion.3. The non-stationary random seismic response analysis on tall connected structure. Considering the non-stationary characteristics of the earthquake ground motion, the connector is divided into "strong connector " and "weak connector", the connection style about connector with the tower is divided into "rigid connection" and "flexible connection", the Bouc-Wen model and the stiffness degradation of Bouc-Wen model are used to simulate the hysteresis of the connector of the damper structure and the tower structure under rare earthquake, respectively, building state-space model, the nonlinear motion equation and equivalent linearization of the connected structure are established, and the system response for each moment is solved by pseudo excitation method and mixed precise integration method while the connector lie different floor or connection.4. The dynamic reliability research on high-rise connected structure. The dynamic reliability of tall connected structure was discussion in detailed under stationary and non-stationary random seismic excitation from 4 aspects. Stationary random excitation, to obtained the dynamic reliability of five kinds of connective conditions of connected structure, assumed the largest layer displacement angle are lognormal distribution for the shear concrete structure, and considering load effect and resistance randomness, the Monte Carlo method are supplemented use to verify the calculate results correctness, considering the non-stationary characteristics of the earthquake ground motion, based on the first passage criterion, suppose cross between events in groups and each group is independent Makov process, the influence of dynamic reliability of high-rise double-tower connected structure are analysis when the connector position is change under frequent and rare earthquake.5. The active control theory research of high-rise connected structure. To compensate the shortcoming for classical LQR optimal control algorithm on the parameters Q and R is not easy to get, the 2 kinds active optimal pole placement algorithm are given, and the analysis of time history and stationary and non-stationary random seismic response of connected structure based on 3 kinds active control algorithm under frequent and rare earthquake were discussed in detail, then the M-C method are supplement use to compare analysis on non-stationary random seismic response and dynamic reliability, and the conclusion on those algorithm method is correct and effective when are used active damper control analysis of high-rise connected structure, and several programs have the same control conclusions.6. The Fuzzy damping control theory research on high-rise connected structure. The fuzzy damping controller design method is given on connected structure, and the fuzzy damping control structure diagram of high-rise connected structure was established. The classical LQR optimal control theory as a reference, the analysis result for use fuzzy control obtained with LQR and other active control results based on a numerical example is given for a detailed study of fuzzy damping control, but the fuzzy control have a advantages which does not depend on the specific analysis model, provide a better reference value for engineering specific application.7. The dynamic test research on connected structure. A six layer steel frame twin towers connected structures is used to test analysis, using seven natural seismic wave excitation given experimental model to obtain the seismic response mean, standard deviation and the maximum response curves of the connected structure when the connector position change, the results has some supplement and verification for previous theory analysis conclusion from the test perspective.