Quasi-static and high cycle fatigue strength of brick masonry
Quasi-static and high cycle fatigue strength of brick masonry
复制标题
砖砌体的准静态和高周疲劳强度
DOI：
10.1016/j.conbuildmat.2005.02.013
复制
发表时间：
2006
影响因子：
7.4
通讯作者：
Bill Bell
中科院分区：
文献类型：
--
作者：
T. M. Roberts;T. Hughes;V. R. Dandamudi;Bill Bell
在实验室干、湿和水下试验条件下对砖石试件进行了准静态和高周疲劳试验。用于制造测试样本的砖和砂浆的相对较低的抗压强度旨在代表相对较旧的砌体拱桥中可能遇到的砖和砂浆的类型。准静态试验结果表明，砖砌体的抗压强度随着砂浆抗压强度的增大而增大，随着饱和度的增大而减小。基于假设的线性无拉应力分布，砖砌体的抗压强度随着载荷偏心率或应力梯度的增加而增加。由于载荷偏心导致的抗压强度明显增加的大约 20% 可归因于非线性材料行为，导致灰缝中非线性无拉应力分布。对实验室干、湿和水下试件的高周疲劳试验表明，砖砌体的疲劳强度取决于诱发应力范围、平均或最大诱发应力以及砖砌体在相似荷载条件下的准静态抗压强度。提出了实验室干、湿和水下砖砌体的下限疲劳强度曲线。
Quasi-static and high cycle fatigue tests have been conducted on brick masonry test specimens under laboratory dry, wet and submerged test conditions. The relatively low compressive strengths of the bricks and mortar used to manufacture the test specimens were intended to be representative of the type of bricks and mortar likely to be encountered in relatively old masonry arch bridges. The quasi-static test results indicate that the compressive strength of brick masonry increases with an increase in the compressive strength of the mortar, and decreases with an increase in the degree of saturation. The compressive strength of brick masonry, based on assumed linear no tension stress distributions, increases with an increase in the load eccentricity or stress gradient. Approximately 20% of the apparent increase in compressive strength due to load eccentricity can be attributed to non-linear material behaviour, resulting in non-linear no tension stress distributions in the mortar joints. The high cycle fatigue tests on laboratory dry, wet and submerged test specimens indicate that the fatigue strength of brick masonry depends upon the induced stress range, the mean or maximum induced stress and the quasi-static compressive strength of the brick masonry under similar loading conditions. A lower bound fatigue strength curve for laboratory dry, wet and submerged brick masonry is proposed.