Viscous Energy Dissipation Damping Technology Research And Application In Structural Seismic Reinforcement

That incorporating passive damper into a structure to absorb or consume a portion of the input energy during the earthquake can greatly enhance the aseismic performance of the structure and the safety of its interior facilities, which has been becoming one of the tendency of earthquake engineering research and practice. Scholars and engineers of this domain in many countiy are being engaged in this field of research and practice. This paper firstly expatiates on the effectiveness of the aseismic performance of the structure resulting from increasing its the damping from the viewpoint of dynamics, and thereon presents the relevant passive dampers that can increase the damping of the structure and their characteristics of dissipative energy. In this chapter the fluid viscous damper is the main discussed object. In chapter 3, this paper describes the various models of the passive dampers for analysis and calculation taking account into the precision and other aspects, and points out the Maxwell model is enough to limn the characteristic of the fluid viscous damper under stress in most operating condition; in chapter 4, this chapter. further validates the rationality and advantage employing the fluid viscous damper in practical project and the reliability of the adopted model on the base of referring relevant experiments overseas and their data. In chapter 5, this chapter probes into the service behavior of the nonlinear viscous damper integrating the practical project. At first in the preliminary design this paper computes the linear damping coefficient of the viscous damper employed in this project using Composite Response Spectra approach, meantime, this paper proves that reducing the exponent of velocity of the piston can increase the magnitude of the dissipative energy, because of the viscous damper employed in the practical project character nonlinear behavior; next this chapter performs analysis and comparison between the building without and with the viscous dampers aforementioned when the building suffers from various Time Domain Response, from the angle of displacement, interstroy drift, velocity, interstory velocity, acceleration, energy, maximum axial force of the dampers and of the column etc., in order to prove that the incorporating the viscous dampers into the buildings has great superiority on enhancing its aseismic performance ; furthermore, this chapter also expatiates on diverse assembly form of the viscous dampers that results in the adverse impact on the internal force of the structural member in this building, on the ground of which this segment bring about the preference of the assembly form of the viscous damper; finally this chapter points out the sphere of application of the analysis and computation using Composite Response Spectra approach in design: it is available in well-proportioned stiffness structures and isn抰 available in the structures that contain weak story. It is recommendable, particularly, to incorporate the fluid viscous dampers into this structure that contain weak story to refrain earthquake and reinforce, such as the Central Hall of Shanghai Exhibition Hall. The research products shown in this dissertation can be directly used in analysis and design of the seismic mitigation employing fluid viscous damper, and also provide a corresponding foundation for further study and improvement of the design theory and analytical computation method.