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1981年本刊第5期刊载李作骏同志的“普通及预应力钢筋混凝土薄腹梁、屋架的起拱问题”一文,作者对该类构件的起拱问题,从理论上作了广泛的探讨,并由此提出在薄腹梁和部分屋架(下弦中节间无竖杆件者)应进行两点起拱(梁的有效高度应保持不变),即“三折线整体起拱”的论点,以及其他屋架在中间一点起拱时屋架的有效高度亦应保持不变等论点,对人们进行该问题的研究有一定的借鉴。但是,该文不足之处,对有些问题的分析在论证时所提出的论据缺乏说服力的。例如作者在提到常规起拱法时,认为“似乎是局部起拱,没有形成整体起拱,在外观效果上也不能避免梁顶面的下弯变形。在使用上是不利
In the fifth issue of the 1981 issue of this volume, Comrade Li Zuojun’s article “Composition of ordinary and prestressed thin-concrete thin-web girders and roof trusses” was widely discussed theoretically. Therefore, it is proposed that in the case of thin webs and some roof trusses (with no vertical rods between the lower middle section), arching should be carried out at two points (the effective height of the beam should be kept constant), ie, the ”triple arched line“ The arguments and the effective height of roof trusses when other roof trussed in the middle point should also remain unchanged, and they have some reference for people to study this problem. However, the deficiencies in this paper are not convincing in the analysis of some issues. For example, when the author mentions the conventional method of arching, he thinks that ”it seems to be a partial arch, there is no overall arching, and the appearance of the beam cannot be avoided because of the appearance of the arch. It is unfavorable to use."