Existing Building Structure At The Top Of The Steel Adding Storey Seismic Performance Analysis

With the rapid development of China’s economy, the face of the city is changing rapidly and becoming increasingly beautiful. However, in some major cities there are still many low-rise or multi layer residential and civil construction, due in large cities concentration of population residential area in urgent need to expand, so you want to transform. Some buildings not previously earthquake-resistant fortification, and some low security standards. Under this circumstance, the technique of adding stories can be employed to strengthen and modify these buildings for ameliorating its usage, seismic reinforcing and improving the dissipative system.The present building reinforcement form is mainly used for steel structure, steel structure with light weight, good anti-seismic performance and convenient construction and the like. Existing building structure layer, the overall building structure is a combination structure, structure of many of the characteristics of change. If we only add layer structure calculation and analysis is not enough, therefore, should be carried out on adding layer of composite structure analyzing.Based on the practical projects, this thesis conducts parametric analysis and summarizes the regulations by ANSYS or SAP2000, directly aiming to the characteristics of the technique of the adding steel stories on the concrete frames. The main objectives include the followings:(1) According to the different properties of the original structures and the different functions of the adding stories, the optimistic structural scheme of adding stories is proposed.(2) From the perspective of the steel adding storey reasonable structure analysis of the weak links in the design of the system, the connection form of the original structure and steel structure and layer.(3) According to a practical project,2D and3D finite element models are established by the software ANSYS or SAP2000to probe the influence of the different stories. Both static and transient analyses are performed. Reached the same structure under different seismic waves have different seismic response time history analysis.(4) Response spectrum analysis to consider different the layers of the number of the steel adding storey whether support, whether reinforcement of the original structure and different damping ratios and other factors, the combination of seismic performance analysis on the basis of the comparison of the data, summarize controlling factors in the structural design, the weak parts that may arise, to take measures to improve the seismic capacity.