Contrast Of Energy Dissipation Mechanism Among Active, Semi-active And Passive Control Structures Under Major Earthquake

At present, the research to structural vibration control is a key issue in the field of earthquake resistance. Different control method is different in work principle and in decouple efficiency. Besides evaluating control efficiency by using the single index such as displacement, acceleration and shearing force, it is significant that to reveal exactly the essential relationship between seismic and damage conditions of buildings which are applied different control strategies and to cognize the decouple mechanisms and control results to structure earthquake responses (especially them under major earthquake) of different control methods from the essential aspect.Transfer, transformation and absorption (dissipation) of energy describe the substantive characteristics of structure earthquake responses. Mitigation or inhibiting of building damage in course of a major seismic depend upon mostly the magnitude of input energy of earthquake and the change of building energy dissipation capacity after employ one kind of control measure. Energy method is just a excellent method of researching building damage level based on the equilibrium relationship between input and dissipation of energy. This method can describe preferably the influence of the three factors of ground motion to structure earthquake responses, especially, it can trace the whole process of building non-linear responses. Energy method is paid a widely attention in the world.In this paper energy method is chosen as the analytical method to apply in evaluation of structure vibration control , from the view of energy , investigate and compare the decouple efficient of active, semi-active and passive control systems. The first step is to choose the study objects and their dynamical models which include mainly division rayleigh damping model and Bouc-Wen hysteresis model. The next is to establish the energy equations according to the motion functions corresponding every control building, define the meaning and derive the expression of every item in the energy equations, make clear the control mechanism of different control method. After finishing the theory study, at the end of the paper, employ a real building as a numerical example to prove the relation between earthquake input energy and displacement response in base isolation and solve the energy responses corresponding to different control systems through Matlab simulation. The result shows that every control method can change the relationship of the energy input and assignation instructure, but the levels and reasons are different. The input and dissipation energy of super structure are control reasonable in active control system, semi-active is follow. Compare to passive control ,the energy input in isolation are increased both active and semi-active building , but the hysteresis energy are decreased ,this kind of result owing to the energy consumption by control force. Control force display the key role in active and semi-active control system.There have a basic relation between energy and structure damage , through energy analysis, the control mechanics and different of control measures are open book.