Les exposés écrits du congrès ont été publiés dans la langue dans laquelle ils ont été soumis à l’ATC.
Long-span, deep-corrugated structural plate bridges have proven effective over the past three decades, with spans reaching up to 32.4 m. While seismic analysis of these structures has historically relied on simplified methods across all seismic zones, CSA S6-19 and S6-25 introduced more rigorous requirements for high seismic zones, including the racking method and non-linear time history analysis. This paper explains and investigates two approaches for estimating the crucial shear displacement profile needed for racking analysis. The seismic performance of the largest such bridge in Canada is examined, assuming a site in Montreal, a region of high seismic hazard. The findings indicate that for the conditions considered, a commonly employed semi-empirical method yields a shear displacement profile consistent with 1D ground response analysis. Furthermore, the soil profile, particularly the bedrock elevation, significantly influences the predicted shear displacement. Finally, the study underscores the importance of carefully considering the relative location of the shear displacement load profile with respect to the bridge structure when applying the racking method.