Analysis of the technical condition of a railway bridge at risk of failure

Mieczysław Piechota,Grzegorz Rogojsz,M Kaszynska

doi:10.1051/matecconf/201928401005

Mieczysław Piechota, Grzegorz Rogojsz + Show 1 more

Open Access

https://doi.org/10.1051/matecconf/201928401005

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Abstract

The paper presents an analysis of the technical condition of a railway bridge structure with a span structure in the form of welded girders. Static diagram of the structure consists of two simply supported beams. The theoretical span of the spans is 2 x 14.50 m, their overall length is 14.90 m, and the total length of the crossing is 30.6 m. The reasons for the formation and development of bridge degradation were analysed. In addition, the actual load capacity of the structure was determined and the possibility of its further operation was evaluated. Particular attention was given to the quality of workmanship and the degradation progress of welded joints, which led to the exclusion of the object from use. The main purpose of the presented analyses is to formulate general recommendations, whose implementation in a direct or indirect form may contribute to reducing the degradation process of railway steel bridge structures. When inspecting welded railway bridges, particular attention should be paid to the condition of welds and to control and prevent the structure from cracking.

Highlights

Bridges are critical points in the infrastructure network and often decide on the usefulness and serviceability of that road network
Carried out diagnostics of bridge structures and proper interpretation of the causes of damage and irregularities allows for the development and implementation of new structural solutions in bridge engineering [15] and innovative construction materials [16]
- for the undamaged structure: σmax = 193,5 MPa (220,7 MPa − without speed limit), - for the damaged structure: σmax = 236,9 MPa (270,1 MPa − without speed limit), Assuming the allowable structural design strenght for built-in K37 steel 190 MPa, the determined stresses at the permissible operating speed are not exceeded for the analysed structure only without taking into account corrosion damage

Summary

Introduction

Bridges are critical points in the infrastructure network and often decide on the usefulness and serviceability of that road network They should be designed and constructed in such a way that their durability is ensured in the assumed period of use as well as on the assumed maintenance level. The endeavour for improvement of the diagnostic tools [3] as well as the development of a system for assessing the degree of degradation of bridges over time can be noted These tools would have supported the assessment of the current technical condition and would have allowed the forecasting the. This range of tests allowed to determine the actual geometric parameters of cross-sections and to determine the degree of weakening of the structure

Description of the technical condition of the bridge

Static structural analysis

Findings

Discussion

Conclusions