In addition, the crack position and configuration reflect the direction and centralized position of the pull stress in concrete, which is certainly corresponding with the reason of the way producting pull stress.
另外,裂缝的位置和形态近似反映了混凝土内拉应力的方向和集中部位,与产生拉应力的原因之间存在比较确定的对应关系。
参考来源 - 基于数字图像处理技术的混凝土表面裂缝特征测量和分析·2,447,543篇论文数据，部分数据来源于NoteExpress
General design requirements are not only a drag stress or a small pull stress.
一般设计中均要求不出现拉应力或者只出现很小的拉应力。
The radial stress is press stress in the joint axis and is gradually from press stress chang into pull stress in the area further away from the axis.
接头内径向残余应力在轴心处为压应力，随着远离轴心逐渐由拉应力变为压应力，在接头边缘区域为拉应力。
But in concrete construction to operation of the cooling period by the highest temperature stability temperature, often in concrete caused considerable internal pull stress.
但是在施工中混凝土由最高温度冷却到运转时期的稳定温度，往往在混凝土内部引起相当大的拉应力。
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