Algorithm to Estimate the Capacity Reserve of Existing Masonry Arch Railway Bridges

被引:4
|
作者
Brighenti, Francesca [1 ]
Possidente, Luca [1 ]
Zonta, Daniele [1 ]
机构
[1] Univ Trento, Dept Civil Environm & Mech Engn, Via Mesiano 77, I-38123 Trento, Italy
来源
APPLIED SCIENCES-BASEL | 2022年 / 12卷 / 02期
关键词
masonry arch bridges; railway infrastructure; reserve capacity assessment; arch geometry; structural health; numerical algorithms; risk assessment; prioritization of interventions; STRUCTURAL ASSESSMENT; ASSESSMENT STRATEGY; CONCRETE BRIDGES; IDENTIFICATION; COLLAPSE; DAMAGE; LOADS;
D O I
10.3390/app12020756
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Featured Application Through the estimate of the Load Rating Factor of existing railway masonry arches, it is possible to identify and define an order of urgency for those bridges belonging to this structural type which fail to comply with current design codes, or which are most in need of thorough verification. As a result, the algorithm presented can be employed within a framework of risk assessment and prioritization of interventions. Most railway masonry arch bridges were designed according to codes that predate the 1950s; therefore, assessing their load-carrying capacity to comply with current codes is of the utmost importance. Nonetheless, acquiring the necessary information to conduct in-depth analyses is expensive and time consuming. In this article, we propose an expeditious procedure to conservatively assess the Load Rating Factor of masonry arch railway bridges based on a minimal set of information: the span, rise-to-span ratio, and design code. This method consists in applying the Static Theorem to determine the most conservative arch geometry compatible with the original design code; assuming this conservative geometrical configuration, the load rating factor, with respect to a different design load, is estimated. Using this algorithm, a parametric analysis was carried out to evaluate the Load Rating Factor of old arch bridges in respect of the modern freight load of the Trans-European Conventional Rail System, for different spans, rise-to-span ratios, and original design codes. The results are reported in easy-to-use charts, and summarized in simple, practical rules, which can help railway operators to rank their bridges based on capacity deficit.
引用
收藏
页数:24
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