Dynamic Time History Analysis On RC Frame Oblique Braced Structure

Concrete braced frame structure is a transitional structure between frame structure and shear wall structure.It’s characterized by replaced shear wall by concrete bracing in frame structure,which can improve literal stiffness,constraint structure deformation.The seismic performance of bracing structure is between frame structure and shear-wall structure,but braced frame structure has advantages like light weight,construction convenience,simple design,flexible layout and low cost.Therefore,bracing structure has a brighter market prospect.Through building the models of frame structure,concrete braced frame structure and frame-shear wall structure by YJK software,performance of three models have been compared in this article.To perform dynamic time history analysis of different models,then further seismic performance has been tested by comparing the cycle of vibration mode,vertex displacement,story drift,shear and moment of floor.The result shows that additional concrete bracing in frame can improve the structure’s stiffness and seismic performance.Meanwhile,through dynamic history analysis,this paper also studies the influence of different section of bracing,different layout style and different placement location to the lateral stiffness,and selects design program with better seismic performance.Conclusion after comprehensive analysis is that in the layout of the bracing should be selected when the larger cross-section,and the use of cross bracing way,while the layout in the middle of the structure as a whole across the formation of a closed area.