极限拉伸——抗拉极限应变是材料的一项重要抗裂性能,尽管近年来在混凝土断裂力学的研究方面取得了许多进展,但要应用于工程设计还有一段差距。因此,在工程中往往还是直接用极限拉伸,例如,在混凝土温度控制设计中常采用以下形式的公式计算允许温差: Ultimate tensile - ultimate tensile strain is a material of an important anti-cracking performance, although in recent years, many advances in the study of concrete fracture mechanics, but there are still some gaps to be applied to engineering design. Therefore, often in the project is still directly stretched with the limit, for example, in concrete temperature control design often use the following formula to calculate the allowable temperature difference: