The bridge network is progressively aging, with an alarming proportion of bridges over 100 years. This situation engenders substantial risks to the overall reliability transportation networks, requiring innovative methods for efficient management. Monitoring can provide a direct source information about structural behavior generating alerts when changes occur. Real-time enable effective infrastructure management and decision-making during damage or anomalous situations. However, monitoring...

Adverse situations such as prolonged downtime of a structure, unnecessary inspections, expensive allocation personal and equipment, deficient structural performance, or failure can be avoided by using health monitoring (SHM). Enhanced safety is the leading reason for its implementation, but one remaining obstacles to fully implement SHM systems deals with justifying their economic benefit. At any point in time, preference towards particular action depends on factors probability triggered...

The use of high strength steel has the potential to reduce amount used in bridges and thereby, facilitate a more sustainable construction. In this study, an optimization composite concrete bridge is presented. study aimed at identifying benefits using steel, compared conventional terms weight, material cost environmental impact. routine followed what outlined Eurocode satisfied both ultimate serviceability limit state conditions, with exception fatigue. To influence fatigue separate...

Local stress concentrations in some specific geometric details often play an essential role time-dependent damage propagation. However, measured strain or data are generally available locations that not the most critical ones. Proper numerical models thus required to aid severity assessment. In this paper, a surrogate model procedure based on local response function method is proposed accurately predict time histories particular regions of bridges through multiscale analysis. The methodology...

The method herein proposed provides a novel perspective about data processing within structural health monitoring, which is essential for automated real-time monitoring and assessment of civil engineering structures. low- high-frequency contents the forced vibration response structure are used to train test artificial neural networks purpose damage detection. In context several scenarios, different versions compared with each other aim verifying most efficient regarding novelty detection...

Abstract The use of high strength steel has the potential to reduce amount used in bridges and thereby, facilitate a more sustainable construction. A survey existing built using is presented this paper with emphasis on Swedish bridge stock. aimed at identifying grades that were where cross-section they have been used. case study influence fatigue shows today’s regulations make it difficult comparison previous regulations.

We review of the state art in probabilistic modelling for fatigue reliability civil engineering and offshore structures. The modeling randomness uncertainty resistance load variables are presented some detail. This is followed by a specifics analysis limit states background on semi-probabilistic treatment safety. discuss different life-cycle concepts give an overview inspection planning. describe choices made Probabilistic Model Code Joint Committee Structural Safety, present alternatives to...

This paper proposes an innovative approach for detecting and quantifying concrete cracks using adaptive threshold method based on Median Absolute Deviation (MAD) in images. The technique applies limited pre-processing steps then dynamically determines a adapted each sub-image depending the greyscale distribution of pixels, resulting tailored crack segmentation. edges are obtained Laplace edge detection method, width is centreline point. method’s performance measured Probability Detection...

This paper investigates the fatigue assessment of existing steel bridges. Measurements can be used to reduce uncertainties in structural behavior and effects action. However, treatment measured response is not clearly defined today's codes practice. A reliability model suggested that treats for bilinear endurance response. parametric study on modeling load effect performed shows a significant influence reliability. The calibration partial safety factors deterministic design equation. enable...

Fatigue is often the decisive design factor when designing steel bridges and improving fatigue strength of critical details can reduce amount material used. In this paper, four different structural detail solutions are investigated compared through numerical simulations. Two evaluated have not been used before in bridge construction. The most promising managed to improve by more than 25% conventional today. studies were performed as a preparation for future testing.

Abstract The condition assessment of bridges considers a combination information from different sources rendering multiple levels possible. This paper illustrates how successive strategies increase the expected utility compared to single choice decisions through Bayesian inference. Multiple allow for additional possibilities obtaining structural health and updating one’s beliefs about condition. Thus, more informed decision-making is possible with respect gain in accuracy versus costs...

The Vänersborg Bridge in southwest Sweden is a single-leaf bascule bridge carrying railway traffic over canal. load consists of passing commuter trains, occasional freight trains and leaf openings to allow ships pass on the constructed from 1914 1916 was built by riveted truss members steel. Over years, several assessments maintenance actions have been performed keep service. During autumn 2021, long-term monitoring campaign initiated with installation sensors register effect possible...

Structural health monitoring with accelerometers provides notable benefits over strain gauges, particularly in installation time and cost efficiency. However, effective local damage assessment necessitates access to stress histories. This paper proposes a methodology that integrates two distinct approaches identify predict across various bridge locations from sparse via acceleration data. The proposed model is validated using histories accelerations collected the composite railway Bryngeån...