It expounds harmfulness and cause of crack of concrete of arch dams , and measures of crack prevention in such structures are suggested 论述了拱坝混凝土产生裂缝的危害性及其原因，并针对性地提出多种温控防裂措施。
Strains in the earth ' s crest seem to pile up , mail the rock formations break with cracks into new positions , often causing large natural earthquakes 地壳的应力似乎在积累着。直到岩层产生裂缝移位为止，这往往全引起大的自然地震。
Strains in the earth ' s crest seem to pile up , mail the rock formations break with cracks into new positions , often causing large natural earthquakes 地壳的应力似乎在积累著。直到岩层产生裂缝移位为止，这往往全引起大的自然地震。
Considering creep influence can also be derived . if their summation is over the tensile strength of the concrete , the crack would exist in the structures 在考虑了徐变影响后可求得相应应力，一旦其总量超过抗拉极限，结构即产生裂缝。
Sometimes , they are hurtful in engineering . however their influence on structural strength and stiffness must be considered in advance 而由于温度应力的作用，对结构的强度、刚度产生一定的影响，有时甚至产生裂缝，从而降低结构的寿命。
Owing to the effects of raw materials , ratio of concrete compounds and construction , cracks tend to occur on the cement concrete pavement in the early stage 但因为原材料、混凝土配合比、施工等因素的影响，水泥混凝土路面早期易产生裂缝。
The original bell , cast in 1856 , and weighing some 15 tons , was being tested in palace yard when it developed serious cracks and had to be scrapped 最原始的钟是在1856年铸造而成的，重达15吨，但因在测适时就产生裂缝，所以很快地就被舍弃。
And then cracking mechanism of concrete of hydraulic structures such as piers is studied thoroughly , measures of crack prevention in such structures are suggested . g 据此对水工墩墙结构混凝土裂缝成因作了较深入的研究，提出了避免类似结构产生裂缝的工程措施。
As the building is getting higher and higher and the planceer is getting thicker and thicker , the planceer is often cracked by temperature stress in project practice 随着建筑高度越来越高，高层建筑底板厚度越来越厚，底板由于温度应力产生裂缝在工程实践中屡见不鲜。
It has beem proved in many projects that the cracks often appear in concrete structure , such as dyke or commercial building in china or abroad 大体积砼结构在施工中容易产生裂缝，这已为众多的工程实践所证实。在水工建设中，国内外许多混凝土大坝都出现了不同程度的开裂。
