圆角

在结构钢工字梁中，圆角是指腹板与翼缘表面之间的弧形过渡，通常在轧制或焊接过程中形成。该几何特征消除了作为应力集中源的尖角，从而提高了梁在动态或循环载荷下的疲劳强度和结构完整性。

圆角通过平滑半径将应力更均匀地分布在腹板与翼缘的连接处，减少尖角处出现的峰值应力集中。这遵循应力消除和断裂力学的工程原理，其中圆角几何形状可防止裂纹萌生和扩展，特别是在焊接或热轧钢截面中。

The fillet works by distributing stress more evenly across the web-flange junction through a smooth radius, reducing peak stress concentrations that occur at sharp corners. This follows engineering principles of stress relief and fracture mechanics, where rounded geometries prevent crack initiation and propagation, particularly in welded or hot-rolled steel sections.