Shakedown and dynamic behaviour of masonry arch railway bridges
نویسندگان
چکیده
Masonry arch bridges form an integral part of our rail infrastructure network and their safety is important for the functioning society. Although, there have been several studies to understand in-service condition masonry bridges, these are mainly focusing on static analyses. However, it well known that moving vehicles exert a dynamic force as they cross them. This paper investigates shakedown behaviour railway under traffic load conditions. A nonlinear, mixed discrete-finite element numerical model was developed investigate response bridge. Each voussoir represented by distinct block, while mortar joints were modelled zero thickness interfaces which can open close depending magnitude direction stresses applied Both real analyses carried out effects loads. In addition, investigations into train bridge interaction undertaken amplification factors (DAFs) estimated. From evaluation results, shown external passes through bridge, plastic deformations residual exist in barrel. Also, depends load. As increases, non-linearity structure evident, decreases natural frequency Hence critical speed decreasing. Observations provided here reveal new insight carrying capacity bridges.
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ژورنال
عنوان ژورنال: Engineering Structures
سال: 2021
ISSN: ['0141-0296', '1873-7323']
DOI: https://doi.org/10.1016/j.engstruct.2020.111474