چكيده به لاتين
A study has been carried out to numerically investigate the performance of a four span bridge bent retrofitted with different options. This study evaluates three different retrofitting provisions, namely steel jacketing, engineered cementitious composite (ECC) jacketing and buckling restrained brace (BRB) for improving the seismic performance of this bridge’s columns. Dynamic time history analyses have been performed to assess the dynamic behavior of the retrofitted bents columns. For modeling, opensees software is used and bridge in as built mode and retrofitted evaluated under near-pulsed and impulsive field earthquakes. The results indicated that the use of BRB, ECC and steel jacketing, respectively, have the most effect in reducing the transverse drift of bridge’s pier. In the longitudinal direction, the use of ECC has the most impact. Seismic vulnerability assessment shows that in slight limit states, reinforcement methods did not have a significant effect on reducing seismic vulnerability. In moderate and extensive limit states, respectively, ECC, BRB and steel jacketing had a fairly bigger impact. In complete limit states, three methods had a significant effect on the reduction of seismic vulnerability, so that the use of BRB improved the seismic behavior most.
