| The dynamic characteristic is an important parameter of the structure. Among complex factors affecting the structural dynamic characteristics, the role of the infill wall can not be ignored. In recent decades, the study of the role of the infill wall to the structural dynamic characteristics focused on the framework and the framework supporting structure system, and the conclusion of the study are mostly qualitative. Research on the influence of the infill wall in the frame-shear structure is rare. Experience and examples which were worth our using for reference were few.The current design methods, taking into account the influence of the infill wall to the cycle, usually according to the number of the infill wall, the basic cycle was multiplied by the discount factor. Generally the discount factor is 0.6-1. This is a broad scope, the influence of the infill wall to other bands cycle and the influence's extent have yet to be further in-depth study.On the other hand, as we all know, the work characteristics of the pure frame structure is similar with the shear beam, its deformation is shear. The pure shear wall structure is cantilever bending, its deformation curve is cantilever-shaped. the ratio of the ideal shear beam stiffness's frequency is 1:3:5, the ratio of the ideal beam bending stiffness's frequency is 1:6.27:17.55. In the framework - shear wall structure, the frequency of the addition of infill wall to the structure is worthy of study.Based on the above two areas, This paper consider the impact of the infill wall respectively application experimental modal analysis (EMA) and the finite element method modal analysis (FEM) for a combination of means of a framework - shear wall structure dynamic characteristics of research. This paper study from the following aspects:1.On the existing norms on the wall filled in the role of the structure of the required both at home and abroad in recent years and filled the wall of the situation that, in the actual structure design and application, filled the role of the earthquake determine the influence of the wall can not be ignored.2. Lateral stiffness of the structure are calculated through simple hand count. And analyze the influence of infill wall to the structural stiffness.3. Using the ambient vibration test technique, the test of dynamic properties of the frame-shear structure were carried out in longitudinal and transverse direction. Moreover, the natural frequencies and modes information of the structure were obtained by the analysis of the Vib'SYS software, which provide basic data for further study. After estimating fundamental period according to the current specifications and comparing with the results of the test, the test result coincided with the law.4. By summary and analysis of the existed infill wall existed models at home and abroad, according to the actual deformation characteristics of infill wall, proposed a more rational and effective equivalent model of infill wall - infill wall cell half stiffness model, proved it by instance, and achieved satisfactory results.5. Using the infill wall half stiffness model cell proposed in this thesis, the finite element model was established according to the practical case of the structure through ANSYS, respectively, without and with infill wall, and frequencies and vibration modes were obtained by doing modal analysis. According to a contrast, the influence of infill wall was analyzed.6. Contrast finite element analysis results and experimental results show that both of them are consistent with the natural frequencies and modal curve. This also demonstrates half stiffness infill-wall cell model used in this thesis has good reliability in engineering. |
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