The Research Of Sub-shearwall Supported By Frame On Seismic Behaviour, 3D Elaborate Analysis And Simplifying Analysis

With the development of cities, there're many reinforced concrete tall-buildings built or being built at everywhere in our country. In order to satisfy the increasing needs of houses, the number of tall-buildings is increasing quickly. At the same time, the structural style of tall-building is complex and variable. The appearance of new structural style makes many tall-building's structural configuration out of the Rules of Code. The multi-function building makes the structural configuration the more complex.In this paper, the author combines the theory analysis with the experiment research method, and discusses the seismic behaviours, 3D elaborate finite element analysis and simplified model analysis of a kind of multi-function tall building-"Sub-shearwall supported by frame", which is applied widely today.The main contents are as follows:In order to observe the failure process and the earthquake response of the complex structure, and to analysis the seismic behaviour of the structural system and structural members, a 1/20 cement mortor model of a complex tall-building which is about to be built was producted and the shaking table test of this model under 26 sorts of earthquake loads was made. Using SAP2000 finite element analysis program, a 3D analysis model was built in computer, and the elastic time-history analysis of the model was done.Constracting the results of finite element analysis and the table shaking test, the seismic behaviour of this kind of structure is assessed. It's an ideal structural system and has multi-earthquake resistance ability because of a great deal of slabs removed in floors above the transfer-story amended the lateral stiffness of the stories near the transfer-story. Based on the available references, the five-spring line element, the three-spring line element and the multiplevertical-line-element model are introduced to model special column, beam and shear-wall, the relevant stiffness matrixes are deduced and the restoring-force models are gaven to deep into the elasto-plastic seismic characteristics of the structure. Acording to the results of shaking table test and elastic finite element analysis, a new making model melhod is presented in which uses the linear and the nonlinear element and the assumption that the floor is infinitely rigid in different areas. This method can satisfactorily save much computer time in elasto-plastic analysis. Based on this method, a 3D nonlinear analysis model was made by using ANASYS finite element program. The results have shown that this melhod is reasonable and the computing results are in agreement with those of test and elastic analysis.By changing some parameters of the original model, such as the location and stiffness of the link members, the location of the transfer-story, the stiffness of the girders on transfer-story, the stiffness of core-tube, the area of the removed slabs and so on, this paper studies the influence of these parameters on seismic behaviour and dynamic characteristics and the seismic behaviours of this building and gives the reasonable proposals on the design of the structure.The 3D parallel super element and the methods of simplifying for calculation of the shear-wall supported by frame and core-tube are presented for practice. This melhod doesn't need the hard work on compiling programs and only a few simple modifications on the structure analysis programs, at the same time it can simplify the process of making model and save the computer time. Contrasted with the results of the simplifying analysis and the 3D elaborate finite element analysis, we found that the simplifying method has sufficient accuracy and can be used in practice.