Seismic Vulnerability Analysis Of Post - Tensioned Prestressed Assembly Energy Consumption Frame Based On IDA Method

Precast concrete structure systems, which conforms to the development direction of housing industrialization of our country. A new kind of the connection form named PTED (post-tensioned energy dissipating) connection of the precast concrete frames is studied, in which the bolted top-seat angles are used as the energy dissipation components.The reseach mainly concentrated in the experiments on the behavior of the PTED connections, the analysis of the experimental results, and finite element analysis of the PTED connection. To further study the seismic performance of the PTED frame, the analysis of seismic fragility and collapse resistance of the PTED frame were carried out based on Incremental Dynamic Analysis method (IDA). The main content is concluded as follows:First, a basic prototype of four-storey and three-span PTED frame was designed with DDBD (Direct Displacement-Based Design) method. The nonlinear analytical model was constructed using OpenSEES software. The main contents are as follows:the problems on the nonlinear modeling are discussed and determined; Pushover analysis of the PTED frame is carried out.Then, ten records of ground motion were selected as the input of the IDA to the PTED frame. The main contents are as follows:the emphasis is on the selection of Intensity Measure and Damage Measure to the analysis; the IDA with different records to the PTED frame were carried out to get different IDA curves; different kinds of records have been selected for the PTED structural failure mode analysis.Finally, the analysis of seismic fragility and collapse resistance of the PTED frame was carried out based on IDA method. The main contents are as follows:the analysis method of seismic fragility is determined; the probability function is derived to establish the structure response; the analysis of seismic fragility and collapse resistance of the PTED frame have been done to obtain the fragility curve and the collapse probability curve.The results show that the double damage measure for PTED frame should contain both the maximum force of prestressing tendons and the maximum story drift angle, instead of single damage measure used in RC frame. According to the IDA results, the probabilistic seismic demand model was established to obtain the fragility curve and the collapse probability curve. The collapse probability of PTED frame under rare earthquake is 0.2%, which indicates that the PTED frame has good anticollapse ability.