| Bridge was regarded as one of the most important part of national highway network. With the national wide range of road network construction, more and more high grade highway were required through the high mountain and deep groove area, and the thin-walled tall hollow pier due to its structure feature was regard as the most economic and practical value of pier types in this terrain. The pier is connected to the upper structure and foundation members and was regarded as the most easily damaged components in the earthquake. However the existing such hollow thin-walled pier is designed based on the old Chinese seismic code, a large part of these piers were still in service life, but its seismic performance has been unable to meet the current seismic code requirements. So the reinforcement technology of thin-walled hollow concrete pier is studied very necessarily.CFRP is widely applied in the reinforcement of bridges as its excellent performances. In view of the above reasons, according to the research status at home and abroad, the finite element analysis method is used in the study of CFRP materials for thin-walled hollow pier seismic reinforcement effect. The main contents are as follows.(1) The whole process of reinforce concrete hollow piers and through CFRP confined reinforced concrete hollow piers under cycle loading were analyzed by the finite element analysis software ANSYS, and with the existing experimental data were compared to verify the model correctness.(2) On the basis of the software model, the unidirectional pushover force static analyses of the structure under the condition of different axial compression ratios, slenderness ratios, reinforcement ratios and the height of the wrapped layers are carried out. By comparing the P-Δ curve and the pier crack under extreme displacement, the effect of CFRP material constraints with the different parameters are analyzed.(3) The analysis of hysteretic behavior under low cyclic loading of the structure under the condition of different axial compression ratios, slenderness ratios, reinforcement ratios and the height of the wrapped layers are carried out. By compare the hysteretic curve and the strain distribution of the structure. The effect of these parameters on the seismic behavior of CFRP confined reinforced concrete rectangular hollow pier is obtained. |
