| 1. | Simplification of longitudinal stresses calculation and equivalence of flexural stiffness for members with lateral circle perforations
成排侧开圆孔受弯构件的应力简化和刚度等效 |
| 2. | 2 transmission of longitudinal stress wave in non - defect pipeline excited by axial symmetry impact has been studied by the numbers
2 、对无缺陷管道中受轴对称冲击载荷下激励出的应力波进行了较为系统的实验研究。 |
| 3. | The longitudinal stresses in the tunnel structure calculated by using the model of tamura & okamoto are obviously greater than the stresses in transverse direction obtained by using two dimensional finite element analysis . it is proposed that the axial and bending stresses should not be ignored for the underground structural design
计算结果表明，由弹簧质量模型算得的地下结构在地震作用下纵向振动和横向振动产生的纵向和弯曲正应力及剪应力明显高于由二维平面有限元算得的横向平面内产生的正应力和剪应力，由此可见轴向应力和弯曲应力是地下结构抗震设计中不容忽视的因素。 |
| 4. | 5 experimental study about the influence that is resulted from the artificial crack flaw on the propagation of longitudinal stress wave in pipeline has been done . experimental result make us know that the signal collected can reflect the defect " s influence which will provide the important basic for the next analysis in this paper
5 、利用实验研究了人工裂纹缺陷对管道中波传播特性的影响，通过对比，用实验证实了这种影响确实存在，为本文进一步对缺陷的识别和定位提供了重要的基础。 |
| 5. | The problem to be solve in this paper bases on this kind of engineering backdrop in this paper , any fundamental studying has been introduced on long - range pipeline not by method of exciting longitudinal stress wave which is base on analyzing domestic and overseas studying development in this domain
本文以工程实际为背景，在分析了这一领域研究现状及前人工作的基础上，对管道的长距离无损检测问题进行了一定程度的基础性研究工作。由于问题的复杂性及其在理论上尚需进一步完善，这些都使本文具有相当的难度。 |
| 6. | This variation of stresses is due to the action of in - plane shear strain in the plate , which is termed “ shear - lag ” . stresses larger than the elementary bending uniform stress thus develop at the web - flange connection . an appropriate reduced “ effective width ” of the plate - with the uniform stress equal to the maximum longitudinal stress - has been widely used by engineers in conjunction with the elementary beam bending theory
但实际上翼缘中剪切变形是不均匀的,由此导致正应力沿桥宽呈曲线分布,从而引出了有效宽度的概念,即按初等梁理论的公式也能得与真实应力峰值接近相等的那个翼缘折算宽度。 |
