A cracking analysis is carried out

A cracking analysis is carried out to determine whether the failure of the arch bridge takes place because of excessive cracking near the crown or any other mode. A tensile strength of brick masonry of 0.20 MPa with a specific fracture energy of 5.8 N-m/m2 is used, and the analysis is carried out by applying the self-weight and incrementally increasing the axle loads on the BOXNEL wagons in steps of 49 kN (5 t). The corresponding loads of the 168 sleepers loaded on the BRN wagons are scaled up proportionately. It was found that the intrados of arch at the crown starts to crack at an axle load of 147 kN (15 t). The cracking process continues, and at an axle load of 392 kN (40 t), the crack propagates through the entire thickness of the brick arch. The crack widths from this incremental analysis are plotted against the axle load in Fig. 8. From this figure, the crack width corresponding to an axle load of 147 kN (15 t) is slightly less than 0.2 mm, which is too small to be observed visually in the field tests. Further, the crack widths increase at a faster rate after the 392-kN (40-t) axle load, which is when the crack propagated through the entire thickness of the brick arch. Thereafter, on increasing the axle load, the crack width increases without the crack propagating further. The arch softens considerable because of the increased opening of the crack. The final failure takes place because of cracking at the crown of the arch.


Read More: http://ascelibrary.org/doi/full/10.1061/%28ASCE%29BE.1943-5592.0000338

結果 (中文) 1:

开裂的分析进行以确定是否失败的拱大桥发生由于过度开裂附近官方或任何其他模式。使用 5.8 m2-N-m 具体骨折能源 0.20 MPa 的砖砌体的抗拉强度，通过应用自重量进行分析和递增的在轨加载 BOXNEL 货车在步骤中的 49 kN (5 t)。BRN 马车上加载的 168 露宿者的相应负荷加大比例。它被发现杆件和拱冠的开始破解 147 轴负荷 kN （15 t）。裂解过程继续，和轴负荷的 392 kN （40 t），裂缝传播通过整个厚度的砖拱。根据图 8 中的轴负荷绘制的裂缝宽度从这个增量分析。从这一数字，对应于 147 轴负载的裂缝宽度 kN （15 t） 是略小于 0.2 m m，这是太小，无法目视在现场试验中观察到。进一步，裂缝宽度后的 392 kN (40-t) 轴负载，当裂纹传播通过整个厚度的砖拱时更快的速度增加。此后，关于增加轴负载，裂缝宽度增加无进一步传播的裂缝。拱由于裂缝的增加开设柔化了相当大的。最后的失败发生开裂的阿奇冠由于


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結果 (中文) 3:

一个裂缝进行分析，以确定是否对拱桥的故障发生由于过度裂化附近的冠或任何其他方式。拉伸强度为0.20 MPa和5.8米/平方米的特定的断裂能是用砖砌体，和分析是通过施加自重和递增的车轴载荷对boxnel货车在49千牛（5吨）的步骤进行。这168个轨枕装载在BRN货车相应荷载的换算比例。结果发现，在冠开始在147 kN轴重裂纹拱拱（15吨）。裂解过程仍在继续，而在392 kN轴重（40 T），裂纹传播通过的整个厚度的砖拱。从这个增量分析裂缝宽度与轴载于图8。从这个图，对应于147千牛轴荷载裂缝宽度（15）略小于0.2毫米，这是太小，可以在现场试验观察。进一步的，裂缝宽度的增加速度392 kN轴重后（40吨），这是当裂纹贯穿整个厚度的砖拱。此后，在提高轴重，无裂纹的进一步传播裂缝宽度增加。大拱软化由于裂纹开口增加。最终的故障发生由于在拱冠开裂。


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