I am conducting non-linear time history analysis for several masonry arch bridges. However, even though I made an extensive search on internet, I couldn't have found any Guildeline/Code to determine the damage levels/limits of masonry arch bridges based on stresses/strains/displacements. 

If someone knows how to determine the seismic damage levels/states of masonry arch bridges, your help will be precious !

Thanks a lot in advance !

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