Method Study On Vibration Control Of Super High-rise Building By Viscous Dampers Subjected To Across-wind Loads

The research in this dissertation study the relative contents of structure control with viscous dampers subjected to across-wind load in three levels of “wind loads”, “structure analysis” and “optimization and design of damper”, the main works and achievements are as follows:1. According to across-wind loads computational model of typical structure, across-wind load time series have been simulated by MATLAB based on auto-regressive AR model. Influence of order number p on simulation effect was discussed, simulation is reliable by comparing the analysis of one super high-rise building using the method of time-history dynamic analysis, the code method and random vibration method. The study shows that as for as the simulated load time series is concerned, order number p between 25 to 100 can achieve better simulations; as for as the structure results is concerned, time-history dynamic analysis with simulated time seriers agree well with the random vibration method and is safer to the code method.2. Simplified analysis method of super high-rise structure is researched. Four simplified structures include secondary member removed(SMR), wide-column analogy(WCA), combination of SMR and WCA(SMR+WCA) and storey model(SM) are introduced, anaylsis software of simplified super high-rise building is written. Focus on a project of super high-rise frame-core tube structure, dynamic characteristics, computation time, dynamic response of four simplified structures subjected to frequent earthquakes and strong wind are compared. Next structure responses of simplified structures with dampers are compared. Results show SMR+WCA method is the best simplified model, with a satisfactory simplified accuracy and computation speed.3. Definition of the Efficiency of Expected value of the Dissipated Power(?) was given and further a location optimization method of energy-dissipation story based on ? was proposed with corresponding steps. According to the characteristics of the super high-rise structure, damper region vertical deformation amplification coefficient of different installations of viscous dampers has been studies, which makes the energy absorption of dampers more accurate. Study cases show that ? can represent the efficiency of dissipated power and vertical deformation of damper region can not be ignored in high-rise buildings.4. Structural additional damping ratio requirement of in different performance level subjected wind loads was derivated. Additional damping ratio requirement index curve was introduced in order to estimate the required additional damping ratio. To determine the required damping force, method one is to derived form additional damping ratio formulation, method two is to derived form dissipated power. The feasibility of the proposed design method is validated through examples.5. For the close attention of limited damper dissipated power under wind loads, power expression and required power was given embarked from the structure level. Further required power contour plot was maken that designer can look up through damping coefficient, velocity index of dampers and its maximum damping force subjected to wind load.6. Wind-induced vibration control design process of high-rise damped building is proposed.