引言这几年来,钢筋混凝土结构中的裂缝是一个引起各方面十分关心的论题。作为有关这一论题的许多见解有二个极端,一种意见认为:如果结构很快就出现裂缝,那么它是无用的。另一种意见认为:制订0.3毫米为裂缝宽度的限值,这不过是推广裂缝显微镜销路的骗人玩意而已。即使是精心设计的建筑结构,也难免会出现裂缝,混凝土收缩和温度变化就往往导致发丝裂缝,对构件中出现的裂缝这件事,人们有各自的看法。比如工程师,他先则怀疑在 Introduction In recent years, cracks in reinforced concrete structures have been a subject of great concern to all. As many opinions on this topic have two extremes, one view is that if the structure soon cracks, then it is useless. Another view is that the development of a limit of 0.3 mm for the width of cracks is merely a deception to promote the sales of crack microscopes. Even a well-designed building structure will inevitably lead to cracks. Shrinkage of concrete and changes in temperature will often lead to cracks in the hairline. People have their own views on the cracks that appear in the components. For example, an engineer, he first suspected that