The Analysis On Seismic Performance Of Energy Dissipation Frame Structure

Compared with the traditional seismic structure and the isolation structure, the energy dissipation structure which can be used in new and reinforce structure has the advantages of obvious damping effect and flexible installation. But, currently the energy dissipation damping structure design and calculation method are still not mature enough. The adding of energy dissipation devices make the damping matrix of the original structure not orthogonal to the mode of vibration and make the solution difficult. The current building seismic code give a certain description of the energy dissipation structure of the solution method, but the method can not be widely used in energy dissipation structure design. In order to promote the application of energy dissipation structure, it is of great significance to study the calculation method and make it more practical.In this paper, the energy dissipation structure is calculated and analyzed. The main work and results are as follows:First of all, it is more scientific to use the condensation technology to build the energy dissipation structure mode. Considering beam-column degrees, the general framework of the structure usually has large dynamic degrees of freedom, so the calculation is large and difficult. The way to simplify the structure as a shear type frame, which assumes the stifness of beam is infinity and the beam column axial stiffness is not considered and the relative displacement between floors is only be considered, is usually be taken. But the error of the way is often very large, only the first frequency of the error is as high as 26.4%. So the condensation technology has been used to simplify the energy dissipation structure model. Considering the stiffness of the beam to avoid the error and greatly reducing the degree of freedom of the structure, the condensation technology has high accuracy of the solution and engineering practical value.Secondly, the iterative method has been used to solve the damping ratio of energy dissipation structure. Due to the addition of the damper, the damping matrix of the structure is no longer a classical damping matrix, so it is difficult to solve the dynamic equation. The total damping ratio of the structure is the key to solve the earthquake action by using the mode decomposition response spectrum method. The specification has given the damping ratio method based on energy method, but the seismic action and the floor displacement which we need to solve are unknown in the method. Therefore, the iterative method has been used to solve the total damping ratio on the base of the given method and obtain the seismic effect of energy dissipation structure.The relevant procedures using FORTRAN 90 to solve the above two problems and the analysis of dynamic characteristics and earthquake calculation of a 10 layers energy dissipation frame structure have been introduced. At the same time, the seismic response of the same structure is analyzed by the SAP2000 mode decomposition response spectrum method and time history analysis method. The results of the period, shear force and displacement are been compared.The contrast analysis shows that the results of the method using in this paper is very closed to the results of the SAP2000 modal decomposition spectrum method and the time history analysis method. Moreover, the results in this paper are closer to the time history analysis results than the ones by SAP2000 mode decomposition reaction spectrum method. Obviously, the calculation and processing of energy dissipation structures of this paper are correct. The analysis of this paper is more simple and practical, which has a high reference and guiding significance.