Experimental Study On Seismic Performance And Seismic Damage Index Considering Reinforced Concrete Bridge Piers

Earthquake is higher frequency then before, so it is necessary to improving the resistance to viberation of buidings. Based on the information of seismic damage of brige piers, we elicit that the piers have the most probability to damage in the component of bridge, and it can lead to the bridge to fall down. Research on nonlinear response and seismic damage of bridge structures is valuable from the viewpoint that it can improve engineers' understanding of earthquake damage mechanism and promote the study of seismic design theory .In this paper we design three group of reinforced concrete bridge pier they have different stirrup space.Experiments of three group of reinforced concrete bridge pier shorten model under the pseudo static test and pushover test have been done in Beijing key laboratory for disaster reduction in civil engineering, Beijing university of technology. Failure pattern, hysteresis curve , skeleton curves, remnant distortion ratio, energy dissipation, and rigidity degeneration of ervery model are studied and contrasted.Seismic damage index of Park-Ang model and the modified Park-Ang model of Wang Dong-sheng (M- Park-Ang model) considering reinforced concrete bridge piers is comulated and contrasted.Through analyzing to the results of this tests we drawed some conclusions:The destroy form of bridge piers model is shear form. And the destroy course is fast. When the model destroy, the plastic deform percentage is low in the overall deform. The scatter extent of the seismic damage index corresponding every destroy phases is short. And study show that with the increasing of stirrup reinforcement ratio the member's seismic performance is improved. When stirrup reinforcement ratio fall to some limit, it will show a little influence to the member's seismic performance because the stirrup reinforce can't restrain the develop of the break effectively. Seismic damage index of the Park-Ang model is more good at the pier models of shear failure model then the Park-Ang model modified by Wang Dongsheng in this experiment.