Study On Shear Reallocation Of High-rise Frame-shear Wall Structure Under Earthquake Based On Elastoplastic Method

The internal force distribution of High-Rise Frame-Shear Wall Structure entering into elastic-plastic level, related to the safety of the entire structural system. At the present time, in the field of engineering design and theoretical studies, the elastic analysis of the High-Rise Frame-Shear Wall Structure already has a mature theory system and calculation methods, however, the internal force analysis of its elastic-plastic state is basically rely on the model test and simplified empirical formula, lack of complete and accurate non-linear calculation method. Scholars are still divided on the law of the seismic shear distribution between the frame and shear walls in High-Rise Frame-Shear Wall Structure within the nonlinear stage.This paper reviews and analysis of a variety of approximate analytical methods at present on the internal force distribution of High-Rise Frame-Shear Wall Structure entering into elastic-plastic level. On the basis of the current studies, aiming at their deficiencies, the article proposes the comprehensive use of the Push-over and time-history analysis method, which is based on the SAP2000calculation procedures. The article focuses on the nonlinear computational analysis of the High-Rise Frame-Shear Wall Structure, on this basis, carries out research and exploration on the shear distribution between the frame and shear walls of its elastic-plastic level. The main work of this paper is as follows:1. Overview the seismic conceptual design ideas of High-Rise Frame-Shear Wall Structure, as well as the seismic force adjustment method and design requirements on framework part of High-Rise Frame-Shear Wall Structure in Chinese current seismic code. Researched the principle of shear redistribution in Frame-shear Wall structure under the earthquake. Summarized approximate calculation method on seismic internal forces of Frame-shear Wall structure proposed by the past scholars. Analysis the mechanical properties of Frame-shear Wall structure. Summarized domestic and external model test data to determine the relationship between the rigidity degradation and the relative rotation angles, which provides a basis for the parameters select in the below research of seismic shear force distribution. On this basis, explored the shear force distribution mechanism of the structure under different deformation stages.2. Described the basic idea and theoretical content of the Push-over method. Summarized the implementation steps of the it, and make comments of its strengths and weaknesses. Use the SAP2000calculation procedure to do the Push-over analysis on the engineering examples, obtained the capacity spectrum and demand spectrum, in addition, observed the development process of plastic hinges, so that to evaluate the seismic performance of the structure. By analyzing the influence of various factors on the internal forces of High-Rise Frame-Shear Wall Structure entering into elastic-plastic level to determine the main parameters of this thesis is the relative rotation angles. Investigated the floor shear distribution of the Structure corresponding to the relative rotation angles, data compiled by the chart, to seek the law of seismic shear distribution between the frame and shear walls.3. Summarized the theory of the structural dynamic analysis, focusing on the time history analysis. Use the nonlinear time-history method to analysis the High-Rise Frame-Shear Wall engineering examples by computing the seismic response of the structures under different PGA (peak ground acceleration).With grouped Comparison for the storey displacement, relative rotation angles and the base shear process results of both frame part and total structure which were obtained through the analysis, further explored the shear distribution law of the High-Rise Frame-Shear Wall Structure entering into elastic-plastic level.The results obtained in this work, verified the rationality of the relevant provisions of China’s specification, provide it with the computational model data support and aseismic theory analytical basis, and also can be used as a supplement and perfect of specification relevant provisions for the actual engineering design when a more detailed calculation of the seismic force of the High-Rise Frame-Shear Wall Structure entering into elastic-plastic level is needed.