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to high shear and deformation reversals. These effects are attributed to the post-cracking toughness of HPFRC in tension and its response in compression, which resembles that of well-confined concrete. However, there have been no tests of coupled HPFRC structural walls, for which the distribution of base shear stresses and wall deformations differ significantly from those in isolated slender walls. This paper presents a detailed comparison of the behavior of four-story RC and HPFRC coupled wall specimens, with an emphasis on deformations in the first story of the walls and in the coupling beams. RESEARCH SIGNIFICANCE Data from large-scale tests of coupled walls linked by RC and HPFRC coupling beams are presented. The testing program included the first HPFRC coupled wall test and one of few tests of large-scale T-shaped RC coupled walls. The results presented should be useful to researchers, designers, and code officials interested in the seismic performance and modeling of RC structures constructed with HPFRC. EXPERIMENTAL PROGRAM