FEM Analysis On Seismic Behavior Of Prestressed Frames

Based on comprehensive literature research, this dissertation carried out the modeStudy include one prestressed concrete frame and under cyclicloads, and theoretic analysis of prestressed frames by using FEM method, nonlinear finite element analysis as following:1 Nonlinear finite element analysis to prestressed frames was performed using the ANSYS FEA program. Influence of axial compression ratio and PPR on mechanics behavior was discussed. The results showed that large axial compression ratio resulted in high ultimate loading capacity, but low ductility and energy dissipation. Large PPR caused a slight improvement on ultimate loading capacity, but low ductility and energy dissipation2 .The quantity of cracks of non-prestressed frames are much more than those of prestressed frames. The situation of cracks closing of prestressed frames is much better than that of non-prestressed frames.3. The plumpness of the load and displacement loops of non-prestressed frames is much better than that of prestressed frames. The load and displacement loops of prestressed frames is more or less a little narrow. The stiffness changes slowly of both non-prestressed frames and prestressed frames at the elastic stage. The degeneration of stiffness of non-prestressed frames is much quickly than that of prestressed frames at the elastic-plastic stage. The stiffness of non-prestressed frames and prestressed frames is tend to be the same after the degeneration of stiffness at the plastic stage.4 Some problems need to be notice when we analysis seismic behavior of concrete using Finite Element Analysis method, include the control of mesh density the control of step length.5 .Based on nonlinear finite element analysis, the paper also studies the MainBuilding structure in the Large-scale Thermal Power Plant Influence of PPR on seismic behavior of structure was discussed. the result indicate that uesing prestressed frames is feasible...