Seismic Response Control Of Structures Using Self-Centering Energy-Dissipation Braces

As a novel seismic design method, the energy-dissipation damping technology, owing to its remarkable damping effect, wide applicability and economic rationality, has received widespread attention and in-depth research, which has been successfully applied to the vibration strengthening of engineering structures. The self-centering energy-dissipation (SCED) brace is a kind of displacement energy dissipation device. With the friction energy-dissipation mechanism, it can effectively eliminate the residual deformation in structure and significantly reduce structure demolition and reconstruction after earthquake. However, due to its infancy research stage and rare application in engineering, the damping effect of the SCED brace is desperate for further research.The herein thesis sums up the research status of the SCED brace as well as its basic structure and working principle. On the basis of quasi-static test result, the finite element modeling and numerical analysis of hysteretic behavior has been done on the SCED brace. And the model is also analyzed under the related design parameters. In addition, the thesis has carried out the comprehensive research on the analysis method and damping effect of the actual structure with the SCED brace under the numerical simulation method. The main contents of the thesis are as follows:1) Detail introduction of the members’basic structure in the SCED brace and its working principle, as well as the quasi-static test of the prototype. Verification on the correctness of the theoretical research by the analysis on the test result, Which is the groundwork for future finite element modeling.2) Based on the quasi-static test result, ABAQUS is used to carry out the finite element modeling and numerical analysis of hysteretic behavior for the SCED brace. The related design parameters of the brace are also analyzed in the model to understand their effects on the hysteretic performance.3) SAP2000 is used to establish the 3D finite element model of the energy dissipation damping structure and the SCED brace. The number and location of the SCED brace in the structural model are also determined. It will explore the analysis method of the seismic performance in the structural model to lay a foundation for the analysis of the seismic performance.4) It carries out the linear time history analysis under frequent earthquake and the nonlinear time history analysis under severe earthquake in the structural model. The calculation results between the seismic performance targets with and without the SCED brace in the structural model are comparing to evaluate the damping effect of the SCED brace in the structure.