Structural systems are under deterioration due to ageing, mechanical stressors, and harsh environment, among other threats. Corrosion fatigue can cause gradual structural deterioration. Moreover, natural man-made hazards may lead a sudden drop in the performance. Inspection maintenance actions performed monitor safety maintain performance over certain thresholds. However, these must be effectively planned throughout life-cycle of system ensure optimum budget allocation maximum possible...

This paper proposes a generalized probabilistic framework for optimum inspection and maintenance planning of deteriorating structures. The proposed covers (1) the damage occurrence propagation service life prediction under uncertainty, (2) relation between degree probability detection an method, (3) effects on life-cycle cost. Optimum types times are obtained through optimization formulation by maximizing expected minimizing total cost consisting costs. life, cost, delay, along with actions,...

Infrastructure management plays an important role in sustainable development and is essential for the evaluation of socioeconomic feasibility existing projects new ones. This paper presents a review key aspects involved maintenance operation infrastructure under uncertainty. It discusses main conceptual theoretical principles guides reader through different problem by offering large set state-of-the-art references. Although does not provide comprehensive description all methods policies...

Civil infrastructure systems are subjected to progressive deterioration resulting from multiple mechanical and environmental stressors. This process is developed under uncertainties related load effects, structural resistance, inspection outcomes, among others. In this context, life-cycle optimization techniques provide a rational approach manage these considering several budgetary safety constraints. paper proposes novel procedure for maintenance planning of aging structures. procedure, the...

Steel bridges that are under severe chloride exposure due to deicing salts or marine environmental effects require frequent maintenance and repair activities extend their service life maintain an adequate performance level. In addition the direct cost, these actions may lead indirect costs associated with traffic delays can significantly increase life-cycle cost of bridge consideration. The use more sustainable materials, such as maintenance-free steel, initial structure; however, including...

The presence of unknown complex boundary conditions usually imposes difficulties in estimating the cable forces cable-stayed bridges when using conventional model-based force identification methodologies. Therefore, there exists a need for new methodologies that can overcome these challenges while achieving acceptable accuracy. This paper presents an innovative method to estimate within stay cables with conditions. proposed approach transforms estimation problem from common procedure...

Single-hand thumb-to-finger microgestures have shown great promise for expressive, fast and direct interactions. However, pioneering gesture recognition systems each focused on a particular subset of gestures. We are still in lack that can detect the set possible gestures to fuller extent. In this paper, we present consolidated design space microgestures. Based space, system using depth sensing convolutional neural networks. It is first accurately detects touch points between fingers as well...

This paper focuses on estimating the fatigue life below constant amplitude threshold (CAFT) of steel bridges by using a probabilistic approach basis bilinear stress (i.e., S-N approach). The current AASHTO uses single line for predicting life. However, because variation actual applied live-load cycles, this very often results in severe underestimation useful structures. It implies that damage respective structural details may be overestimated. To improve estimation, is integrated into...

Successful management of deteriorating structures requires the reliable prediction damage occurrence as well time-dependent propagation under uncertainty. The reliability performance process can be significantly improved by integrating information gained from inspection and monitoring actions. This integration leads to a more accurate level and, eventually, better supported decision-making process. In this paper, probabilistic approach is proposed find an optimum plan for fatigue-sensitive...

This paper proposes an approach for developing optimal risk-based management strategies bridges in coastal regions. Currently, bridge these regions are designed to limit the negative effects corrosion has on performance under traffic loads. However, recent large-scale hurricanes and their associated damage have demonstrated need consider when making decisions. aims develop that include both repair actions address deteriorating loads retrofit minimize potential failure during hurricanes. The...

The evolution of naval vessels toward high-speed crafts subjected to severe sea conditions has promoted an increasing interest in lightweight high-strength materials. Due its strength and weight characteristics, aluminum been proven especially suitable as construction material for hull structures well other vessel parts. However, fatigue needs be effectively addressed the proper life-cycle assessment. Structural health monitoring systems constitute effective tools measuring structural...

Climate change has been recognized as a significant threat for transportation infrastructure. The in temperature profiles and precipitation patterns the increase intensity of weather-related extreme events are among effects attributed to climate change. Additionally, may also alter frequency flood events, which increases complexity assessing risk bridge failure due flood-related modes. Flood occurrence generally rate river bed erosion cause formation scour holes around piers, leading an...

Structural health monitoring (SHM) activities are essential for achieving a realistic characterisation of bridge structural performance levels throughout the service life. These can help detect damage before potential occurrence component- or system-level failures. In addition to their application at discrete times, SHM systems also be installed provide long-term accurate and reliable data continuously entire life bridge. Owing superior accuracy durability compared traditional strain gages,...

This paper presents an approach to fatigue reliability assessment of railway bridges based on probabilistic dynamic analysis a coupled train-bridge system. The loading from moving trains is investigated through novel in which three-dimensional (3D) numerical models both the train and bridge are integrated with wheel-rail interaction model perform analysis. results this used estimate long-term time-variant details. Train speed track irregularities selected as random variables system model....

The increasing intensity and frequency of extreme hydrological events poses a significant threat to the safety transportation infrastructure across globe. To reduce failure risk associated with these structures, bridge assessment management approaches should adapt possible increases in future flood hazards. Fragility analysis can assist managers properly quantifying reliability bridges under different hazard levels. However, conducting such while accounting for various uncertainties...

Fatigue assessment of several steel bridge details, having equivalent stress range below the constant amplitude fatigue threshold (CAFT), showed that many these details are free cracks, although remaining life calculations predicted they should have already been suffering from cracks. This shows current methods for predicting bridges can be conservative and may lead to unnecessary retrofit rehabilitation actions. For a better prediction, bilinear S-N approach has proposed. In this approach,...