| In recent years, frequent earthquake disasters for countries and people and caused great loss for building structures, the seismic performance were payed more and more attention to. The portal frame structure with tapered members has become the most popular type of lightage steel structure in China. The performance of their research is focused on stable, optimal design, whereas the seismic performance is still relatively small. Therefore, it is necessary to have a thorough study on the seimic behavior of this structure.The research subject was the portal frame structural system, which was composed of two tapered frame, using ANSYS finite element analysis software to seismic elastoplastic time-history analysis of these structures. First, create two types of finite element models: space model and plane model, through finite element analysis of the two models and test results compared to verify the validity and superiority of the spatial model; then select three earthquake waves according to the regulation, which are used to seismic elastoplastic time-history analysis of five kinds portal frames chosen from standard design drawings. Analysis of the structure imposed by the two horizontal directions at the same wave, by comparing the eaves and ridge of displacement and acceleration response, the whole structure's stress response, to research the deformation features and failure mechanisms of the whole portal frames under the bi-directional earthquake action, the results show that all the portal frames studied in this paper can statisfy the seismic fortification demand, when choose the deformation and ductility failure criteria as the portal frame structural's damage index. |
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