英德
有道
百度
谷歌
图片
维基
百科
收缩因素 [shōu suō yīn sù]
shrinkage factor
- 早期混凝土由于水化反应都会产生体积变化.如果体积变形受到约束就会产生应力,一旦超过混凝土的抗拉强度就会产生裂缝.由于早期混凝土的力学性能是随时间变化的,特别是徐变,它不仅与加载时间有关而且同时随龄期而变化,因此计算早期混凝土结构应力是较为复杂的问题.有限单元法不仅可以考虑混凝土刚度的变化,而且可以考虑温度、徐变、收缩等因素.本文利用初应力法对通用有限元软件ANSYS进行了二次开发,通过工程实例计算了高层建筑地下室侧墙早期混凝土应力的变化过程,并提出了相应的抗裂措施.
All concrete structures are exposed to volume changes caused by hydration reactions in the early age.If the volume changes are restrained,stresses is generated which will cause cracking when it overcomes the tensile strength.As the mechanical properties of early age concrete vary with time,especially the creep degree depends on the time elapsed and the time at loading,to calculate the stress of concrete structure is a complex nonlinear problem.The finite element method (FEM) can take account of the evolution of the stiffness properties,the development of thermal strain,creep,shrinkage and so on.In this paper,a general approach for numerically simulating this type of behaviour is presented firstly.Then,how to solve this problem is introduced by the general finite element software ANSYS using the Initial Stress Method.Finally,a detailed description of an example calculation that demonstrates the potential of the numerical simulation strategy follows. - 影响混凝土收缩应变的因素主要有环境年平均相对湿度、构件理论厚度及水泥种类等,文中分别对各影响因素加以量化,找出其中影响规律,为桥梁设计人员提供参考。
The major factors that affect the concrete shrinkage strain are annual average relative humidity,theoretical depth of components and kinds of concrete etc.,all the factors are quantitatively analyzed so as to explore the governing law.This is for bridge designers reference. - 其低温开裂机理表明聚酯纤维低温抗裂性是影响沥青路面温度收缩裂缝的主要因素。
The study on appending different polyester fibers weighing content in asphalt concrete under different temperature conditions has been done to analyze the anti-cracking in pavement.
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