Study And Application Of Incremental Dynamic Analysis Method

Earthquake is a great harmful nature disaster, people used to adopt pure safeguard life safety of prevention. However, in recent years, a series of earthquakes have caused huge economic losses, in such context, Performance-Based Seismic Design is proposed. Increment Dynamic Analysis method (IDA) is a powerful earthquake engineering analysis method in Performance-Based Seismic Design, the basic content and specific application of this method are studied in this paper, the research work as follows:1. An approximate integral approach - fast nonlinear integral method is introduced, the basic principle and analysis steps are expounded. Combined with a numerical example, the higher calculation efficiency and better precision of the method are demonstrated in this paper. It is also based on the efficient calculation method, the wide application of IDA in the actual engineering can be achieved.2. The basic principles, analysis steps and fundamental issues involved in IDA method, such as the selection of ground motion records, the selection of seismic intensity parameter, how to define the structure limit state and statistical methods of IDA curves, are discussed in detail, and combined with a numerical example, the specific implementation process of IDA is explained.3. The basic principle and main content of seismic vulnerability are expounded, the seismic vulnerability curve of the example is obtained, the establishing process of seismic demand probability model is introduced, the design field seismic risk curve of the example is obtained, and combined with results of seismic vulnerability and seismic risk analysis, the annual average probability of exceeding structure limit state is calculated.4. IDA method is used to analyze three different beam-column flexural strength ratio of structure models and a structure model without floor. According to the analysis results, the seismic demand probability models and seismic vulnerability curves of each structure model are obtained, and combined with results of seismic vulnerability and seismic risk analysis, annual average probability of exceed structure limit state is calculated.