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一些大型钢筋混凝土梁的实验结果和观察提出了这样一个问题:现行设计规范中关于由梁的配筋控制侧面裂缝的效果究竟怎样?我们对44个试件做了实验,探索腰筋是怎样影响梁的侧面裂缝的。实验参数包括腰筋的数量、位置、分布情况、形式、保护层厚度、梁的腹宽和梁高。实验结果说明:现行规范的有关条文是不恰当的。腰筋仅仅在梁两侧的混凝土窄条内发生影响,而与梁的腹宽无关;腰筋控制裂缝的效果仅与腰筋的配筋率有关;随着梁高的增加,为了把裂缝控制在同一程度,腰筋的配筋率也随之增加。
The experimental results and observations of some large reinforced concrete beams have raised such a question: What is the effect of the current design code on the control of side cracks by beam reinforcement? We have done experiments on 44 specimens to explore how lumbar reinforcement affects The side cracks of the beam. The experimental parameters include the number, location, distribution, form, thickness of the protective layer, web width and height of the beam. The experimental results show that the relevant provisions of the current regulations are not appropriate. Waist tendons only affect the concrete narrow strips on both sides of the beam, and have nothing to do with the web width of the beam; the effect of the waist crack control cracks is only related to the reinforcement ratio of the waist reinforcement; as the beam height increases, in order to control the cracks At the same level, the reinforcement ratio of lumbar reinforcement also increases.