不过总体效应却超过了部份的总和。
先天的安全储备不足加上各敏感性因素引起的应力波动，两者的效应总和达到混凝土的抗拉极限值，造成结构开裂；
The congenital safety margin and the stress fluctuations which caused by various sensitive parameters combine to the antipulls limit value of the concretes, and create the structure dehiscence.
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