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钢筋混凝土梁在荷载作用下会产生挠度,而且随着时间的增长,其挠度还会增加。因此,挠度是设计应考虑的问题之一。梁的允许挠度值主要应满足结构的可使用性和人体感觉的可接受程度。为此,钢筋混凝土结构设计规范《TJ10-74》第25条作了具体规定。虽然挠度控制的决定因素是设计,即梁截面的大小、配筋多少、混凝土标号及结构形式等,但也与施工有关,如梁制作时预先起拱则可以减少挠度;施工时模板的刚度不足或支撑没有楔紧,在施工荷载作用下,梁中的挠度便会增大。对此,钢筋混凝土工程施工及验收规范《GB
Reinforced concrete beams will have deflection under load and their deflection will increase with time. Therefore, deflection is one of the issues that design should consider. The allowable deflection of the beam should primarily satisfy the acceptable use of the structure and the human body. For this purpose, Article 25 of the TJ10-74 design specification for reinforced concrete structures makes specific provisions. Although the decisive factor of the deflection control is the design, ie the size of the beam section, the number of reinforcements, the concrete marking and the structure type, etc., it is also related to the construction. For example, pre-arching the beam can reduce the deflection; the rigidity of the template during construction is insufficient. Or the support is not wedge tight, under the construction load, the deflection in the beam will increase. In this regard, the GB code for the construction and acceptance of reinforced concrete works