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The following recommendations are applicable to end-support beams of bisymmetrical cross-section for which the contribution of warping stiffness to the buckling strength may be neglected. 以下建议适用于具有双轴对称截面的端部支撑梁，对于这种梁而言，扭曲刚度对于屈曲强度的贡献可以忽略不计。