Box section has the special features both its mass center and moment center unification as double symmetry cold-formed section and its outstanding advantage in moment and torsion rigidity.

• 摘要冷弯薄壁双轴对称箱形截面具有形心、弯心重合的特点，与单轴对称开口截面相比具有抗弯、扭刚度大的优点。