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钢筋混凝土双向受弯构件是一种在工程中经常遇到的基本构件。我国现行钢筋混凝土结构设计规范TJ10-74附录五中给出了这种构件的近似计算方法。这种近似方法将混凝土受压区面积简化为矩形,与实际(通常是三角形或梯形)出入较大,而且这种方法计算值偏低,不经济,有待改进。南京工学院学报一九八一年第三期发表了吕志涛老师的“钢筋混凝土双向受弯构件正截面强度计算”一文(以下简称吕文)。文中通过试验研究和理论推导提出了新的计算方法和公式。这种方法不再采用将混凝土受压区面积简化为矩形的近似手法,而是按照截面中和轴的实际位置,分别对混凝土受压区形状是三角形或梯形的两种情况推导了相应的计算公式。
Reinforced concrete biaxial bending members are a basic component that is often encountered in engineering. The approximate calculation method for this kind of member is given in Annex V of China’s current reinforced concrete structural design specification TJ10-74. This approximate method simplifies the area of the compression zone of the concrete into a rectangle, which is larger and larger than the actual (usually triangular or trapezoidal), and the calculated value of this method is low and uneconomical and needs improvement. In the third issue of 1981, the Journal of Nanjing Institute of Technology published the article “Calculation of normal section strength of reinforced concrete biaxial bending members” by Lü Zhitao (hereinafter referred to as Lu Wen). In this paper, a new calculation method and formula are proposed through experimental research and theoretical derivation. This method no longer uses the approximate method of reducing the area of the compression zone of the concrete into a rectangle, but according to the actual position of the section and the neutral axis, the corresponding calculations are derived for the two cases where the pressure zone of the concrete is triangular or trapezoidal. formula.