Seismic mitigation of a benchmark twenty-story steel structure based on intermodal targeted energy transfer (IMTET) - Majdi Gzal; Juan E. Carrion; Mohammad A. AL-Shudeifat; Billie F. Spencer; Joel P. Conte; Alexander F. Vakakis; Lawrence A. Bergman; Oleg V. Gendelman (Engineering Structures, 2023)