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中心受压钢杆的承载力常决定于稳定的临界力,当计算方法由容许应力转变为极限状态时,中心受压钢杆的计算临界应力值并未变更,因而安全度发生了变化。 本文分析了世界各国采用的中心受压钢杆的稳定安全系数,证明我国规范中采用的安全度偏低,特别是呆荷载占全部荷载的百分比较大的构件。因而建议适当修改工作条件系数和纵向弯曲系数,以改进目前存在的中心受压钢杆安全度不均衡的现象。
The bearing capacity of the center compression steel bar often depends on the stability of the critical force. When the calculation method changes from the allowable stress to the limit state, the calculated critical stress value of the center pressed steel bar does not change, and thus the safety degree changes. This paper analyzes the stable safety factor of the central compression steel rod adopted by various countries in the world, and proves that the safety degree adopted in the Chinese regulations is low, especially the component that the dead load accounts for a large percentage of the total load. Therefore, it is suggested that the coefficient of working conditions and the longitudinal bending coefficient should be appropriately modified to improve the existing phenomenon of unbalanced safety of the steel bar under pressure.