Study On Seismic Fragility Analysis Of RC High-Rise Frame-Shear Wall Buildings

The seismic vulnerability analysis of high-rise buildings has been one of the key issues, which can not be avoided in the modern urban earthquake damage prediction. As the development of the modern urban, high-rise buildings are emerging gradually. Reinforced concrete (RC) frame-shear wall structure as the main structural system in the high-rise buildings is widely used. Therefore, to carry out the research on the analysis of seismic vulnerability of such structure has great engineering application value in the disaster prevention and earthquake disaster emergency.First, this paper elaborates the research status on the seismic vulnerability in and abroad. High-rise RC frame-shear wall structure which is lack of earthquake damage data is complex, with that its actual response should contain more factors while the earthquake occurs, and the effect due to the high modes can not be neglected. Meanwhile, there is less research on the seismic vulnerability analysis of this structure, at present. In this paper, a method is proposed which use increment dynamic analysis in the seismic vulnerability analysis of RC frame-shear wall.Secondly, the nonlinear dynamic analysis model of high-rise RC frame-shear wall building is introduced about the research on the various models and corresponding feature of structural components. Based on the OpenSees platform, a fiber beam-column element model and a multi-vertical-line-element-model (MVLEM) are used in the structure seismic vulnerability with an example of a 2d high-rise RC frame-shear wall building in which IDA method is applied specifically. Calculation of the structure seismic response under different earthquake intensity shows that the macro MVLEM using in the frame-shear wall structure with IDA method can significantly reduce time-consuming calculation, which improve computational efficiency in the high-rise structure dynamic analysis. In addition, the selections of ground motion records, seismic intensity parameters and structural engineering demand parameters are studied against the characteristics of the high-rise structure. The result shows that PGV is a more effective ground motion parameter in the high-rise structure, which can reduce the vulnerability curve uncertainty. Then, according to the principles of seismic vulnerability analysis, seismic vulnerability curves based on the PGA and PGV ground motion intensity parameters with the IDA method, are given respectively in order to achieve seismic performance evaluation. Studies have shown that it provides a workable solution for the seismic vulnerability analysis of high-rise frame-shear wall which is lack of information on the actual earthquake damage.Finally, the work is summarized and the directions for future work are proposed.