众所周知,作为稳定问题来考虑的理想柱子的强度,在弹性范围内可以采用欧拉(Euler)荷载,在非弹性区则一般认为可以采用切线模量荷载。通常,切线模量荷载是使柱子仍然保持直线形状的最大荷载,因而它并不能准确地给出实际的屈曲荷载(即在挠曲不大的情况下柱子所能承受的荷载)。但它只比柱子的临界荷载稍低一些,故仍可将其作为柱子的临界荷载看待。据此,对于任何金属结构(包括钢和铝合金)的轴心受压柱,只要有完整的材料受压的应力应变图,就可以用理论方法求出在整个屈曲范围 It is well known that the strength of an ideal column considered as a stabilization problem can be Euler loading in the elastic range, and tangential modulus loading in the non-elastic area is generally considered. In general, the tangential modulus load is the maximum load that keeps the column still in a straight line shape, so it does not accurately give the actual buckling load (ie, the load that the column can withstand under low deflection). However, it is only slightly lower than the critical load of the column, so it can still be regarded as the critical load of the column. Accordingly, for any axially compressed column of any metal structure (including steel and aluminum alloy), as long as there is a complete stress and strain diagram of the material under pressure, the theoretical method can be used to determine the entire buckling range.