Pushover Analysis of Anti-seismic Strengthening on Damaged Reinforced Concrete Frame

Using the finite element Pushover analysis, we study the anti-seismic strengthening methods including CFRP cloth, angel steel and steel support reinforcement on damaged frame structure under earthquake simulation test. The changes of ultimate load and displacement, yield load and displacement, ductility coefficient before and after the reinforcement of reinforced concrete frame structure are contrasted, and the affects of damage degree and strengthening plans to the anti-seismic ability of strengthening concrete frame are analyzed. The result shows that the place of the plastic hinge is basically as same as that of the test result; When using the CFRP cloth, ultimate load and displacement, yield load and displacement, ductility coefficient result of the strengthened damaged concrete frame and that of the undamaged concrete frame are basically consist with each other, while for the damaged reinforced concrete frame, repairing the local damage of beam strengthening the beam firstly and then strengthening the frame using chevron angle iron, the effect is better.