Influence of the use of external shear keys on the seismic behavior of Chilean highway bridges

The comparison of the fragility curves for damage levels I (initial slip) and II (large residual displacement of the superstructure) shows that the most vulnerable bridges are bridges without external shear keys, regardless of the seismic hazard zone and the type of soil. For damage level III (collapse) it is irrelevant whether or not the bridge has external shear keys.