The flange width of HEB steel directly influences lateral stability in tall buildings by:
Increasing Moment of Inertia: Wider flanges (e.g., HEB 300's 300mm width) enhance resistance to bending under wind or seismic forces, reducing the risk of lateral buckling.
Improving Connection Strength: Broader flanges provide more surface area for bolted or welded connections to beams and braces, enhancing the overall rigidity of the structural frame.
Balancing Load Distribution: In superstructures, equal flange width ensures vertical loads from floors and roofs are evenly transferred to columns, minimizing stress concentrations.
Engineers select flange widths based on building height and local wind/seismic codes. For example, a 30 - story building in a high - wind zone may use HEB 400 with 400mm flanges to withstand lateral forces, while a mid - rise structure in a low - risk area might opt for narrower flanges (HEB 200) to optimize material use.
