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一、前言读了吕先生的论文以後,我有如下几点意见。 (一)我认为吕先生所提出的方法有下列畿条缺点: 1.公式太多,且相当繁,不便记忆,所以解题时必须有现成的公式在手边。 2.那些公式仅能适用于具有T形构件的基本结构。 3.就吕先生所提出的结构而言,所解的联立方程的数目最後看来好像祇是二元联立方程,而实际上,吕先生在对称荷载的计算部分解的是三元联立方程,而在反对称荷载的计算部分解的是四元联立方程,不过在解这些联立方程的次序上,吕先生是预先消掉了一部罢了。如吕先生所给出的公式(3),(4a)和(4b)正是成立方程后消去部分未知数的结果,并用利用这些结果也并不比直接求解联立方程简单。 4.求Eθ和E△的数值後,当我们去计算r形构件的各程端力矩值时仍具有相当大的工作量,特别是求r形构件的中间结点处的力矩值更是费事。
I. Preface After reading Mr. Lu’s paper, I have the following points. (a) I think that the method proposed by Mr. Lu has the following flaws: 1. The formula is too numerous, and it is very complicated and inconvenient to memorize. Therefore, there must be a ready-made formula at hand when solving a problem. 2. Those formulas can only be applied to basic structures with T-shaped members. 3. In terms of the structure proposed by Mr. Lu, the number of simultaneous equations to be solved seems to be only a binary simultaneous equation at the end. In fact, Mr. Lu’s solution to the calculation of the symmetric load is to solve the three-dimensional equation. Cheng, and the solution to the anti-symmetric load is partly solved by the four-element simultaneous equations, but in order to solve the order of these simultaneous equations, Mr. Lu has eliminated one in advance. Formulas (3), (4a) and (4b), as given by Mr. Lu, are the result of elimination of some unknowns after the equation is established, and the use of these results is not as simple as directly solving the simultaneous equations. 4. After calculating the values of Eθ and E△, when we calculate the moment value of each end of the r-shaped member, it still has a considerable workload, especially the torque value at the middle node of the r-shaped member is even more troublesome. .