三、长柱的计算美国ACI规范关于长柱的计算提出了两种方法。一种是较为精确的方法(ACI10.10.1条)。对于这种方法,在ACI规范中仅有原则规定,规定须考虑竖向荷载及随时间而改变的混凝土材性对构件刚度和固端弯矩的影响,以及变形对弯矩和轴力的影响。较为详细的论述可参见文献〔5〕以及文献〔2〕的第十五章。精确法适用于长细比(?) 大于100的构件(此值系试验时所取的 Third, the calculation of the long column The United States ACI specification on the calculation of long columns proposed two methods. One is a more accurate method (ACI 10.10.1). For this method, there is only a principle provision in the ACI specification, which stipulates that the effect of the vertical load and the change of concrete properties on the stiffness and the bending moment of the fixed end of the concrete must be considered, and the effect of the deformation on the bending moment and the axial force. . For a more detailed discussion, see [15] and Chapter 15 of [2]. The exact method is applicable to components with a slenderness ratio (?) greater than 100 (this value is taken from the test