| Since ancient times, the earthquake disaster always has great threat to both the production and human life. Humanity have been continuing to accumulate the experience of the earthquake relief for a long time while science and technology has been making considerable progress gradually. Now, the structural damping control has become one of the development trend of building structures to withstand earthquake disaster. With the increase in building height, the seismic load as well as the impact of higher modes become the main problems of structural analysis and design. Also, the problems are involved in the balance of economic and security issues.First two chapters of this article mainly elaborate the development, principles and methods of structural damping control technology. And it describes in details of the structure and working principle of the Buckling Restrained Brace. The analysis theory and methods of the Buckling Restrained Brace system are also necessarily introduced as the summary of previous studies.Then, the author introduces a practical framework-tube structure in Chapter3. It is respective that modeling the appropriately simplified overall structure with PKPM and SAP2000software. And the comparative analysis of the calculation results is carried out. After confirming the accuracy of the modeling, weaken the original structure for the preparation of adding Buckling Restrained Braces. Next, the improved elastic stiffness method is put forward. The amplification factor is introduced to make an application on amplifing earthquake. The key principles and procedures of using the amplification factor are described. Amplified earthquake can effectively reduce the number of iterative. The demanded lateral stiffness of the overall structure can be calculated directly from the the displacement limit requirements as well as the main structural stiffness distribution. The example is also given for validation. Modal response spectrum method is used to calculate the energy dissipation system with Buckling Restrained Brace. Elastic time history analysis is carried out after the design to ensure the security. The results show that overall seismic performance of the structure meets the specification requirements. Although the axial compression ratio of the columns connected to the brace increases, the value is still less than the specification limit. Third, run the dynamic elastoplastic analysis on the energy dissipation system with Buckling Restrained Brace. Before the analysis, the author introduces related knowledge of nonlinear constitutive relations, nonlinear hinge properties and layered shell element, which are required to build the elastoplastic analysis model. Then7seismic waves are input to run the analysis. After strong earthquakes, the numerical results are the focus to analysis, which are consist of elastoplastic story displacement angle, story shear, the performance of the damper, energy situation of the structure, the change of the perimeter frame shear distribution ratio and the development of the plastic hinges. The analysis results show that: In the elastoplastic stage, checking of the damping structural deformation meets specification requirements and meets the requirements of "Strong Column and Weak Beam" and "Under the strong earthquake, the building does not fall". And we are aware of the weak story parts of damping structure. It can reinforce a strong basis for strengthening the design in order to improve the capacity of weak parts to bearing seismic. In short, the process reaches the purpose of the dynamic elastoplastic analysis.Forth, through a10-story office building with Buckling Restrained Brace, the author makes a detailed discussion of that how to use the improved response surface method to optimize the design of energy dissipation system with Buckling Restrained Brace as a comparison example. And the process of using this method is also described. While optimizing the design of energy dissipation system with Buckling Restrained Brace, additional total effective stiffness is set as the objective function and story drift limit value is set as the optimization constraint. The author uses own programming control center software to build a dynamic link between SAP2000and uniform experiment. The software makes it easier to collect the experimental input and output data. Then use the ACE regression techniques to get a response surface. On the basis of the response surface, the author rewritten MATLAB interpolation procedures to get the parameters of Buckling Restrained Brace which meets the constraints. Compared the optimal design and original design, it turns out that about20%of the additional stiffness can be saved. The method is fast to calculate, and does not require solving specific analytical solution.Finally, the summary of the main sections of this article is made. At the same time, the author obtains some useful conclusions. Combined with research and engineering applications, problems to be solved in the subject as well as the further development directions are proposed to enspirit the research craze in the future. The energy dissipation structure with Buckling Restrained Brace is the combination product of the damping technology and traditional structure, which can effectively improve the seismic performance. The study of this article will play a positive role in the application of high-rise structures with Buckling Restrained Brace. |
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