Optimal Research On The Vibration Reduction Control Of Adjacent Structures Linked By Dampers

With the economic and social development, the per capita area in city is gradually reduced, leading to a increasing serious massing of buildings. How to prevent collision of close-packed buildings in the earthquake and improve the seismic and wind resistance of these buildings are more and more important. Thence, the concept of modern structural control, using control devices to connect the adjacent buildings has emerged. Viscous liquid damper, as an effective control component, is widely used. In this paper, the location and damping parameters of viscous dampers connecting adjacent buildings are optimized simultaneously and validated in simulated earthquake shaking table tests. The seismic response by damper after the elastic-plastic state is analyzed, and a reasonable way for adjacent structural damping. Major researches are as follows:The seismic response analyses are conducted using Maxwell model, which involves two different kinds of adjacent buildings connecting by viscous dampers. Damper locations and parameters are optimized simultaneously. The seismic response comparisons of main structure and sub-structure are carried out in the actions of five critical seismic waves (El Centro, tianjin, taft, Shw, La Union). The results with different mass ratio, different stiffness and existing of dampers or not are obtained, respectively. It is proposed the optimal locations and corresponding damping coefficient using enumeration method, aiming to minimize the maximum relative displacement of the top layer. The performances of the top-level main structure with different damping coefficients are studied. The relationships among the seismic response, optimal damping coefficient and mass ratio, stiffness of main structure and sub-structure are analyzed. The optimal locations of damper are identified.Two adjacent frame shear wall models, 15-storey main structure and seven-layer sub-structure are designed. Finite element analysis is carried out to determine the damping parameters in the vibration table test. Based on the analysis mentioned earlier, the detailed comparisons with seismic responses for adjacent structures are obtained. Selecting two kinds of better locations for damper ,entering three kinds of seismic waves (EI Centro, San Fernando and Shw2) and acceleration peaks, it is aimed to get the optimal damping coefficient and damper parameters, with the target of minimal relative displacement at the top layer of main structure. The damping force-displacement hysteretic curves of experimental damper are analyzed to test the role of the energy consumption of dampers.The simulating tests for the above model structures are conducted. According to fortification requirements, shaking table tests of adjacent structures in several conditions are carried out. Different intensity levels(frequently met intensity, 7 degrees basically met intensity and rarely met intensity),different types of earthquake waves(EI Centro waves, San Fernando waves and Shw2 waves),different states of dampers(no dampers and three kinds of connecting locations for dampers )are under the whole consideration. The author analyzed dynamic feature and responses, such as, acceleration , displacement, shear force ,strain and so on. The results show superiority of simultaneous optimization of damping coefficient and linking locations. Comparing experimental results and theoretical values, it is validated by the reliability of analysis. Furthermore, the author analyzes the control effect of seismic response by dampers under the state of elastic-plastic, discusses the weakness of adjacent structures in rarely met earthquake, and put forward reasonable damping methods.