Issue 66

A. J. Abdulridha, Frattura ed Integrità Strutturale, 66 (2023) 273-296; DOI: 10.3221/IGF-ESIS.66.17

Figure 12: The 12-story buildings behavior (a) Story - lateral displacement curves and (b) Story -lateral drift curves.

E FFECT OF ECCENTRIC X - BRACING ON THE STORY LATERAL DISPLACEMENT

T

he impact of bracings may be studied using story lateral displacement tables and graphs. It is found that the lateral displacements at each story level may be significantly increased at the top story level by adding different eccentric bracing patterns to the basic frame structure. The chart shows that for multi-story buildings with six stories and an X-brace section of W6x16 at the corner position, the lateral displacement rises by 14.9%, 84.7%, and 119.1% as eccentricity increases. Moreover, for multi-story buildings with a W6x16 eccentric X-brace section at the side position, an increased eccentrically braced frame increased lateral displacement by 23.8%, 94.4%, and 131.2%. For 9-story multi-story buildings with an X-brace section of W6x16 in the corner position, increasing the eccentricity of the bracing from 0 to 1500mm increased the lateral displacement of by 12.9 percent, 79.4 percent and 80.7 percent, respectively. Furthermore, for multi-story buildings with an X-brace section of W6x16 at the side position, increases in eccentrically braced frames from 0 to 1500mm resulted in increasing the lateral displacement of by 40.2, 101.3 and 102.3 percent, respectively. For 12-story multi-story buildings with an X-brace section of W6x16 at the corner site, the lateral displacement decreased by 3.6%, 16.1%, and 19.9% as the eccentricity of the bracing increased. Furthermore, for multi-story buildings with a W6x16 eccentric X-brace section at the side position, the lateral displacement decreased by 2.0%, 13.7%, and 17.9% as stories increased. Compared to 9- and 12-story multi-story structures, the findings show that eccentric X-braces are superior at minimizing upper-story displacement in 6-story multi-story buildings. Lateral displacement at each floor rose as the eccentricity of the eccentric X-brace did since the structure became less stiff laterally.

283