Abstract
The article deals with an analysis of railway masonry arch bridges. Typical attributes of these bridges are pointing loss and backfill. Therefore, the material - masonry - behaviour can be described only by a non-linear stress-strain diagram, mainly because of low or no tensile strength. The load carrying capacity, which is one of the main parameters when assessing the bridge, is a non-linear problem with many inputs, such as properties of backfill and masonry, backfill depth and geometry of the arch. Some of these parameters can be obtained by a diagnostic survey or from archival documentation. Some of these parameters impact the calculation greatly and some negligibly. The identification of key parameters, which must be stated by the diagnostic survey, is the goal of this article.
Highlights
In the Czech Republic, masonry vault bridges account for 35 % of railway bridges
According to [1], 80 % of Czech masonry vault railway bridges are older than 100 years. 85 % of Czech masonry vault railway bridges are in a “good” structural state, 14 % are in a “bad” structural state and 1 % are in a serious, unsatisfactory structural state
This is due to the lack of bridge maintenance and the uncertainty of the inspectors in the assessment. The consequence of such a structural state is a low load carrying capacity, which is given by the bridge inspection by multiplying the original LCC by αs, which is ≤ 1
Summary
In the Czech Republic, masonry vault bridges account for 35 % of railway bridges. A similar portion of masonry bridges can be found throughout the whole Europe. 85 % of Czech masonry vault railway bridges are in a “good” structural state, 14 % are in a “bad” structural state and 1 % are in a serious, unsatisfactory structural state. This is due to the lack of bridge maintenance and the uncertainty of the inspectors in the assessment. The consequence of such a structural state is a low load carrying capacity (hereinafter referred as “LCC”), which is given by the bridge inspection by multiplying the original LCC by αs, which is ≤ 1. The various methods of calculating the LCC and the influence of individual input calculation parameters on the resulting load capacity is being discussed in this article
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