论文部分内容阅读
锥形杆挠度的設算是假定为固定在土壤中的悬臂梁。锥形杆断面尺寸与配筋是沿高度变化,則断面刚度也相应变化,求其挠度的精确值用一般的建筑力学方法是困难的。现将常用的几种近似計算方法做簡要介紹与比較如下: 1.差分方程法将錐形杆視作由几段等长等差直径的悬臂梁組成。如图1,每段长△l=l/n,当n由0至∞时,△l→0即变成真实的锥形杆。每段自右至左的顺序号为1、2……n,其相应平均直径所求得的惯性矩为J_1,J_2……J_n。其最后結果如下(詳細推导从略):
The design of the cone deflection is assumed to be a cantilever fixed in the soil. Conical rod cross-section size and reinforcement along the height changes, the section stiffness also changes accordingly, to find the exact value of the deflection with the general method of construction mechanics is difficult. Now commonly used several approximate calculation method to do a brief introduction and comparison are as follows: 1. The difference equation method of the tapered rod as a number of equal length differential diameter cantilever beams. As shown in Figure 1, each segment has a length of Δ l = l / n. When n is from 0 to ∞, △ l → 0 becomes a true tapered rod. Each right-to-left sequence number is 1,2 ... n, the corresponding average diameter of the moment of inertia obtained J_1, J_2 ...... J_n. The final result is as follows (detailed derivation omitted):