PSI - Issue 70

Vivek Kumar C et al. / Procedia Structural Integrity 70 (2025) 97–104

103

Story14 0.000435 0.000668 0.000434 0.000434 0.001054 0.001054 0.000496 0.000496 Story13 0.000553 0.000914 0.000553 0.000553 0.001113 0.001113 0.000644 0.000644 Story12 0.000663 0.001122 0.000663 0.000663 0.001164 0.001164 0.000768 0.000768 Story11 0.000757 0.001297 0.000758 0.000758 0.001203 0.001203 0.000874 0.000874 Story10 0.000836 0.00144 0.000836 0.000836 0.001228 0.001228 0.000958 0.000958 Story9 0.000898 0.001555 0.000899 0.000899 0.001236 0.001236 0.001026 0.001026 Story8 0.000946 0.001645 0.000947 0.000947 0.001224 0.001224 0.001075 0.001075 Story7 0.00098 0.001712 0.000981 0.000981 0.001191 0.001191 0.001111 0.001111 Story6 0.001 0.001759 0.001001 0.001001 0.001134 0.001134 0.001132 0.001132 Story5 0.001004 0.001788 0.001006 0.001006 0.001052 0.001052 0.001142 0.001142 Story4 0.000987 0.001804 0.000988 0.000988 0.000942 0.000942 0.00114 0.00114 Story3 0.000927 0.001808 0.000929 0.000929 0.000804 0.000804 0.001124 0.001124 Story2 0.000773 0.001799 0.000775 0.000775 0.000633 0.000633 0.001053 0.001053 Story1 0.000383 0.00154 0.000384 0.000384 0.000422 0.000422 0.000671 0.000671 Base 0 0 0 0 0 0 0 0

Fig.6. Storey Drift at different X bracing locations

The X-bracing system reduces drift values on all floors compared to the unbraced system, particularly in upper floors with greater lateral movement. At Story 15, EQx drift decreases from 0.000324 (unbraced) to 0.000322 (X braced), while EQy drops from 0.000388 to 0.000322. At Story 1, EQx drift is similar for both systems (0.000384 X braced vs 0.000383 unbraced), but EQy drift is lower in the X-braced system (0.000422 vs 0.00154 unbraced). X bracing effectively minimizes drift at corners and critical points where highest moments and forces occur. In Story 15, corner drift for the unbraced system is 0.000987 (EQx and EQy), unchanged in the X-braced system. At alternate locations, drift decreases from 0.00034 (unbraced) to 0.00034 (X-braced). Central X-bracing optimally minimizes inter-storey drift in multi-storey steel structures, especially in upper storeys. At the 15th storey, EQy direction drift reduces from 0.000388 to 0.000322 with Central X-bracing, while base drift decreases from 0.00154 to 0.000422. Corner bracing shows minimal impact at 0.000987 drift, while Alternate bracing matches unbraced systems. Central X-bracing's effectiveness stems from its alignment with the building's center, promoting uniform lateral resistance. 6. Conclusion Based on results from the G+15 structure with X Bracing in various positions (Corners, Centre, Alternate) analyzed using ETABS, the comparisons are: 1. At Story 15, the X-braced system achieves displacement of 34.427 mm in EQx and 46.159 mm in EQy, less than unbraced system's 53.628 mm (EQx) and 63.714 mm (EQy), showing uniform stability with X-bracing. The X-braced system records lower drift values at the center than the unbraced system. At Story 1, it shows a drift of 0.000322 in EQx and EQy, while the unbraced system has 0.000383 in EQx and 0.00154 in EQy. This pattern persists across all stories, highlighting superior control over lateral displacement. At Story 1, drift at corners in the X-braced system is 0.000422 in EQx and EQy, lower than the unbraced system's values.