Anti-seismic Performance Research Of High-rise Steel Structure System With Damper

At present, vibration control in engineering structures is one of the hot issues in the anti-seismic technology. Viscous fluid damper has the broad application prospect in actual structural vibration control due to its simple device, material economy, damping effect obviously. Viscous fluid damper in structure engineering application made a rapid development, and its outstanding performance was widely praised. Some components of traditional structures in the earthquake absorbed a large amount of seismic energy, and then entered elastic-plastic state to yield, damage, leading to the structure beyond repair or even collapsed directly after the earthquake. Rational arrangement of damper in the structure can consume most of the seismic energy, reduce the structural displacement, and improve the anti-seismic performance. Now, energy dissipation technology has become one of the major developments in the anti-seismic research. Anti-seismic experts and scholars from various countries are committed to research and extend energy dissipation technology. Time-history is a common method of the energy dissipation.This paper systematically expounds the basic theories and design methods of the viscous dampers. When local structures are non-linear and most of the other structures are elastic, "fast nonlinear analysis"(FNA) can be used for solving. This paper bases on a 32 layer high-rise steel structure as the research object, using ETABS program establish three-dimensional mode of the framework structure and energy dissipation structure with viscous damper, and analyse the self-vibration characteristics of the frame structure; and verify the damping performance of viscous dampers by multi-earthquake elastic time-history analysis and rare-earthquake elastic-plastic time-history analysis with El Centor wave, Tatf wave, and Tianjin wave; and compare and analyze the influence on structural damping effect by the viscous damper with different velocity indices, when the velocity indices is smaller, it is more effective for structure damping control, and the viscous damper with the smaller velocity indices is more effective for structure damping control. Analysis showed that the viscous dampers not only can work effectively under multi-earthquake, but also can play a role of energy dissipation under rare-earthquake in emergency.