As an important restrainer for bridges,bridge shear keys can restrain the lateral displacement of girders and avoid the damage from falling girders during earthquakes,but there are some deficiencies about the current shear keys design regu-lations,influencing their function.The results from analysis on the failure mechanism and mechanical performance model of concrete shear keys with three types of failure and energy-absorbing steel shear keys show that the shear key design should have reliable yield strength and energy dissipation mechanism to reduce the transverse displacement of the girders and the seismic response of the pier and abutment.Compared with the traditional concrete shear key,the concrete shear key in slip shear failure mode and the energy-dissipation steel shear key are more controllable in terms of strength and energy dissipa-tion mechanism in seismic design,more suitable for popularization and application in practical engineering.Their structural form and bearing capacity are worthy of further research.
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