Research On Performance Improvement And Reconstruction Design Of Existing High-rise Concrete Structure

Performance-based seismic design theory subverts the traditional seismic thought; this kind of design method can transfer drab, macro seismic design into target specific, quantitative, multiple seismic designs. And the owner can choose design performance objects and fortification levels. This kind of design method can analyze the seismic performance of the structure deeply and carefully, and better reflects the initiative of designers at the same time. The seismic design principle which is introduced into the seismic strengthening design of our country has important utility value.A lot of seismic damage makes people more and more aware of the importance of structural seismic strengthening design. Elastic analysis method is simple and convenient, but it ignores the nonlinear characteristics of the structure. And unable describe the internal force and deformation conditions of the the structural members of big erthquake into the elastic-plastic state. The static elasto-plastic analysis method is so easy to operate as to substitute the dynamic Elasto-plastic analysis method to evaluate the structure under the rear earthquake. In order to evaluat the reinforcing structure seismic performance better, this paper adopts the elastic analysis and Static Elastic-plastic analysis method to assess a complex high-rise reinforced seismic performance in Liaoning area.In this paper, Based on the reinforcement and reconstruction of a certain complex high-rise in chaoyang city as the research object. And the nonlinear performance state of reinforcement and reconstruction structure under rear earthquake as the theme, the software Midas Building is adopted to create the finite element analysis model in the paper. The shear wall, steel support and the structure of the wing wall reinforcement were calculated under the frequent earthquake and the rare earthquake and the seismic performances of structure were evaluated. The characteristic value analysis, response spectrum analysis and time-history analysis under the frequent earthquake are conducted respectively in the paper. When making lastic time-history analysis, two natural waves and one artificial wave are used on the structure. Based on the contrastive analysis of the base shear-top displacement curve, storey drift displacement angle, base shear distribution to evaluate seismic performance of the reinforced structure. The static Elasto-plastic analysis under the rare earthquake is conducted respectively. When making static Elasto-plastic analysis, storey shear loading modes are used to analyze. On the basis of comparison among base shear-top displacement curve, lateral deformation, story drift displacement angle, base shear distribution and plastic hinge distribution to evaluate the seismic performance of the reinforced structure. Finally, the results by comparing static elasto-plastic analysis method to choose reasonable structure reinforcement scheme.