Simulation Analysis of Pseudo-dynamic Test of Resilient Prefabricated Prestressed Steel Frame

Resilient prestressed steel frame (RPSF) can reduce structural damage, reduce or eliminate residual deformations, and are easy to repair after a strong earthquake. However, this type of structural system requires on-site aerial tension in high-rise buildings. Therefore, the new structure system resilient prefabricated prestressed steel frame (RPPSF) for high-rise buildings and performance-based design method were put forward by authors, which avoids the potential issues of aerial PT operations. The beam of the resilient prefabricated prestressed steel frame (RPPSF) is divided into three parts: a long-beam portion and two short-beam portions at both ends. These parts are connected with a vertical plate, and PT high-strength strands run parallel to the beam. Brass plates are sandwiched between the webs of the beam and the friction plates so as to achieve reliable friction performance and dissipate energy. The entire assembly is connected to the column similar to a traditional beam. A four-story 3×5 span prototype structure was design and the 0.75 scale substructure pseudo-dynamic test was conducted. In this thesis, a finite element model using software ABAQUS aims at investigating the dynamic mechanical behavior of resilient prefabricated prestressed steel frame (RPPSF) and simulating the process of pseudo-dynamic test has been established. Through comparing the results of finite element analysis (FEA) and the pseudo-dynamic test, RPPSF is proved to have a good gap opening and closing mechanism, favorable energy dissipating capacity, structural self-centering and recovering function after the rare seismic actions. Additionally, numerical results are in coincidence with that from the test basically, revealing the fact that the finite element method is capable enough of simulating the actual state of the pseudodynamic test, and is reliable in the predicting compensating the real structure responses results respectively. Moreover, FEA provides visual results for the plastic strain developing variation of the structural members, presenting the plasticity development process with the intensification of the seismic actions more visually, and having research on the strain condition the test cannot reach. Last but not the least, for the FEA model has the characteristics to be able to apply more ideal boundary conditions and loads on the structure, resolve the problems that cannot be solved in real test such as resolving the problem that unsymmetric stiffness appeared at both ends, it may both enable a thorough dynamic mechanical behavior analysis towards the new structure system RPPSF and lay the foundation for the space test of it.