Standard guide for calculating in situ equivalent elastic moduli of pavement materials using layered elastic theory 使用多层弹性理论计算筑路材料原位相等弹性模量的标准导则
Numerical simulation of equivalent elastic modulus for metal matrix nano - composite materials using homogenization method 金属基纳米复合材料等效弹性模量的均匀化方法数值模拟
The equivalent elastic modulus was deduced by comprehensive considering deflection and elastic modulus 通过综合考虑挠度引起弹性模量和弹性伸长引起弹性模量推导出等效弹性模量。
Applying classical wave theory , a concept of equivalent elastic modulus on propagation speed modification of guided wave through " variable cross - section " of metal bar embeded layer was put forward 摘要运用波动的经典理论,提出了导波在金属杆嵌入层“变截面”传播时波速改变的“等效弹性模量”的概念。
The in - plane equivalent elastic modulus and tensile strength of stitched composite laminates are studied , and it ' s found that the in - plane equivalent elastic modulus decreases with the increase of stitch density , stitch thread diameter , maximal misalignment angle and the distortion width , and the range is about 5 % . the tensile strength of stitched composite laminate increases with the increase of stitch step and decreases with the stitch space . the 研究结果表明:随着缝纫密度、缝纫线直径、最大纤维偏转角和缝纫变形区宽度的增加,缝纫复合材料层合板面内等效模量逐渐降低,最大降幅一般在5 %左右;缝纫复合材料层合板的拉伸强度随缝纫针距的增加而增大,随缝纫行距的增加而降低,因此缝纫密度对拉伸强度的影响程度要看具体的缝纫针距和行距。
3 . this thesis analyses and contrasts the coefficient of creep of concrete filled steel tubes , develops the calculation formulas of equivalent elastic modulus , adopts common structure analyses procedure ansys to calculate the redistribution of section stress in the concrete filled steel tubes arch bridge 同时根据钢管混凝土组合结构的受力特点,应用“龄期调整的有效弹性摸量法”推导出核心混凝土考虑徐变影响后的徐变等效弹性模量计算公式,从而利用通用有限元ansys进行钢管混凝土拱桥的应力重分布计算。
This thesis has made the contrast test of shrink and creep for plain concrete and concrete filled steel tubes on the basis of long term in - door test , obtains the principles of shrink - creep of concrete filled steel tube , simulates the test data , analyses and contrasts the coefficient of shrink and creep , thus offers reference for the calculation mode of creep , furthermore by introducing reasonable assuming at the same time , develops the calculation formula of equivalent elastic modulus at the same time , develops the calculation formula of equivalent elastic modulus , adopts common structure analyses procedure ansys to calculate the redistribution of section stress in the steel tube and concrete during operation 本文在长期的室内试验的基础上对素混凝土和钢管混凝土做了收缩和徐变的对比试验,得出钢管混凝土的收缩徐变规律,对试验数据进行了拟合,对钢管混凝土的收缩和徐变系数进行了分析和比较,从而为钢管混凝土的徐变计算模式提供参考,同时通过引入合理的假定,并结合由“龄期调整有效模量法”导出的混凝土徐变本构关系,推导出了钢管核心混凝土考虑徐变影响后的等效弹性模量计算公式,并以此为基础采用通用结构分析程序ansys对成桥后钢管和混凝土应力重分布进行了计算。
Several kind of simplified calculating models are introduced . the web and flange plates in mcar with a large number of corrugations were equivalent to orthotropic curve plates . the equivalent elastic modulus was yielded by tensile tests , which provides the material constants data for the structural static and dynamic analysis 2 、综述了拱型波纹钢屋盖的各种简化计算模型,并把带有波纹的腹板和底板分别等效成正交各向异性平曲板,通过拉伸测试了它们的等效弹性模量,为结构的静力和动力有限元分析提供材料常数依据。
The calculation modes of the coefficient of shrinkage and creep of the bulgy core concrete in steel tube are discussed . based on a few reasonable hypotheses and the stress - strain relation of concrete acquired by the " adjusting valid modulus depending on load time " method , a compact formula is reasoned out , which is applied to calculate the equivalent elastic modulus of the bulgy core concrete considering the affection of shrinkage and creep . so , the analysis of the affection on cfst arch bridge by shrinkage and creep can be progressed by pole - girder fem , further more , the analysis precision is quite high 本文还对核心膨胀混凝土特殊的收缩、徐变系数计算模式展开了探讨,在合理的假设前提下,采用“龄期调整的有效模量法”得到的混凝土的本构关系,推导出钢管内核心混凝土在考虑徐变影响后的等效弹性模量计算公式,并以此为基础采用杆系有限元方法来对钢管混凝土拱桥进行较高精度的收缩徐变分析。