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常遇到如图 Ia、b、c 的大梁在均布及集中荷载作用下,如何计算它的配筋问题。 1954年第二期的德国杂志建筑设计及建筑技术 BAUPLANUNG UND BAUTECHN1K发表了“钢筋混凝土矩形截面单跨双坡梁的截面计算”一文,被引用于中国工业出版社1970年版的建筑结构设计手册(静力计算)中的192～195页上。这个方法不但应用范围很少,并且是错误的,有时甚至相差30%以上。因为它的来源是按变截面梁导出,误认为应力最大的地方配筋最大。现把它的推导过程写于下面,如图1 a,在均布荷载 q 作用下,有:
Often encountered in Figure Ia, b, c girder uniform and concentrated load, how to calculate its reinforcement. In the second edition of the German magazine “BAUPLANUNG UND BAUTECHN1K”, published in the second issue of the German magazine “1954,” the article “Cross-section calculation of single-span double-slope beam with rectangular cross-section of reinforced concrete” was quoted in the 1970 edition of the Architectural Design Manual of China Industrial Press. (Calculation) on pages 192-195. This method not only has a limited range of applications, it is also wrong, and sometimes even a difference of more than 30%. Because its source is derived from a variable cross-section beam, it is mistaken for the largest reinforcement in places where stress is greatest. We now write its derivation process below, as shown in Fig. 1a. Under the action of uniform load q, there are: