Design Method And Optimal Control For Energy Dissipation System Using Velocity-Dependent Dampers

Dampers set properly in structures can reduce the earthquake-induced response of structural systems through absorbing parts of earthquake energy. Then the structural seismic performance would be improved. Recently, the technology of passive energy dissipation has been applied for new buildings and seismic rehabilitation of buildings. Its theory research is getting more and more attention, but passive energy dissipation as a new technology is still developing. However, the simplified and effective methods be used for design and optimizing is not yet available. The main objective of this study is to improve the existing design method and optimal control procedures of passive energy dissipation systems. The paper is divided into five chapters. Productions obtained are as follows:1. An improved displacement-based design method for passive energy dissipation systems adding viscous dampers is put forward. Restoring force skeleton of equivalent single-degree-of-freedom system of multi-degree-of-freedom system is plotted, which based on the method of nonlinear static analysis (Pushover analysis). Required additional damping ratio is directly determined by the analysis of nonlinear time history analysis, which is caused by the proper choice of earthquake wave. This article makes some explanation of design method for new energy dissipation buildings and seismic rehabilitation of buildings according to their features. For new energy dissipation buildings, this article points out that the effect of additional damping ratio should be taken into consideration in the design of the structure before installation of dampers by the application of mode-superposition response spectrum method.2. A simple iteration method is brought forward to determine additional damping ratio of necessary viscoelastic dampers. As a result, the improved displacement-based design method is applied to passive energy dissipation systems adding viscoelastic dampers. The relational expression of additional damping ratio and stiffness of viscoelastic fixed in energy systems is established on the basis of pertinence between equivalent stiffness and damping coefficient of viscoelastic dampers. Having assuming additional damping ratio, the corresponding additional stiffness could be calculated. Then, nonlinear time history analysis can be implemented for equivalent single-degree-of-freedom system analysis. If the maximum displacement response is kept within bounds of target displacement error, the iteration will stop. The mode-...