集材和运材索道的承载索,当拉应力和弯曲应力都在起作用时,合应力σ等于拉应力σ_1与弯曲应力 P 之和。拉应力σ_t 可根据安全要求通过适当的拉力计算求出;在跑车作用下的弯曲应力 P,可取用规定的轮压与拉力比的偏小值进行校核。但是,托索滑轮处的弯曲应力σ_b,也按轮压荷重比来确定是不妥当的,应按下式计算: When the tensile stress and the bending stress are both active, the resultant stress σ is equal to the sum of the tensile stress σ_1 and the bending stress P. Tensile stress σ_t can be calculated according to safety requirements by appropriate tension calculation; under the action of sports car bending stress P, it is desirable to use the provisions of the wheel pressure and tension ratio of the smaller values ​​for verification. However, it is not appropriate to determine the bending stress σ_b at the pulley of the Torsodor wheel according to the wheel load-weight ratio and should be calculated as follows: