ASEISMIC ANALYSIS OF SELF-CENTERING PRESTRESSED CONCRETE FRAME STRUCTURE WITH INFILL WALLS

The stiffness and energy dissipating capacity of self-centering prestressed concrete (SCPC) frame structures can be improved by the arrangement of infill walls. 4 kinds of infill walls with different strength were selected from Chinese design code to install into a SCPC frame structure. The numerical models of the SCPC frame structure and the 4 SCPC frame structures with infill walls were established via the finite element software, OpenSees. Firstly, the low reversed cyclic loading analysis and pushover analysis were carried out on the SCPC frame structure and the 4 SCPC frame structures with infill walls, and then the dynamic analysis under severe earthquake actions of 15 suits ground motion records were carried out on the 5 models to investigate the influence of infill walls on aseismic performance of SCPC frame structures. The comparison of the results show that:the initial stiffness, energy dissipating capacity of structures are improved, and the dynamic responses are decreased, but residual deformation are enhanced due to the presence of infill walls. With the strength increase of infill walls, the increased amplitude of residual deformation is far higher than the decreased amplitude of dynamic response. It is suggested that:the stiffness and energy dissipating capacity of SCPC frame structures can be improved, whole dynamic response can be reduced effectively, and the residual inter-story drift ratio can be controlled to less than 0.4%, the threshold value of repairable limit state, under severe earthquake actions by the arrangement of infill walls, the strength of which is above 15%~24% of concrete strength.