基于挠度控制的钢筋混凝土梁高确定方法

提出了钢筋混凝土梁合理高度的理论计算方法，为结构工程师在结构方案设计阶段确定梁的高度提供了一个理论公式。在建立一般梁的挠度曲线方程的基础上，考虑钢筋混凝土梁的徐变和最优配筋率，并结合抗弯承载力和挠度控制的要求，推导了钢筋混凝土梁的最大跨高比公式。在分析各种典型工况的钢筋混凝土梁参数的基础上给出：一般简支主梁跨高比为8～12。简支次梁跨高比为12～20。固支梁跨高比为简支梁的1．5倍。采用本文方法确定钢筋混凝土梁高，计算结果与常用工程经验取值接近，克服了工程中通常采用的根据经验公式、简化梁的分类粗略估算梁高的不足之处，为不同工况下的梁高取值估算提供了更为详尽的计算公式。

An approach to height determination of reinforced concrete beam based on deflection control

A theoretical method for height determination of a reinforced concrete bream (RCB) was developed in this paper, which could be used in the scheme design stage by a structure engineer. Based on the concept to build the deflection curve equation of a normal beam, the maximum beam span depth ratio of a RCB was derived by considering the creep, optional steel ratio of reinforced concrete, deflection and load-carrying capacity criterions. After the analyses of the parameters from a RCB at various typical loading conditions, the following data were suggested: the span/depth ratio was between 8 to 12 for a simply supported primary beam; 12 to 20 for a simply supported secondary beam; and 1.5 times of a simply supported beam for a fixed beam in engineering design. The height determination of a RCB can be made by the theoretical method present here, but not only by the experience method as usual. The result from this method is completely agreed with that from the experience method.