scholarly journals Failure Evaluation of Bridge Deck Based on Parallel Connection Bayesian Network: Analytical Model

Materials ◽  
2021 ◽  
Vol 14 (6) ◽  
pp. 1411
Author(s):  
Yang Ding ◽  
Jingliang Dong ◽  
Tonglin Yang ◽  
Shuangxi Zhou ◽  
Yongqi Wei
Keyword(s):  
Bayesian Network ◽  
Fatigue Failure ◽  
Bridge Deck ◽  
Evaluation Model ◽  
System Level ◽  
Fatigue Reliability ◽  
Long Span Bridges ◽  
Long Span ◽  
Proposed Model ◽  
Analytical Expressions

Failure is a major element that causes deterioration, which in turn affects the serviceability of long span bridges. Currently, the Bayesian network, which relates to probability statistics, is widely used for evaluating fatigue failure reliability. In particular, Bayesian network can not only calculate the fatigue failure at the system level, but also deduce the fatigue failure at the weld level. In this study, a system-level fatigue reliability evaluation model of a bridge deck (BD), which is seen as a parallel system, is proposed based on the Bayesian network. A fatigue probability reliability model of the BD was derived using the master S-N curve. In addition, the Monte Carlo (MC) method was applied to solve the multi-dimensional and complex analytical expressions in the Bayesian network. The applicability of the proposed model was demonstrated by three numerical case studies.

scholarly journals Damage Evaluation of Bridge Hanger Based on Bayesian Inference: Analytical Model

2021 ◽  
Vol 2021 ◽  
pp. 1-9
Author(s):  
Yang Ding ◽  
Jing-liang Dong ◽  
Tong-lin Yang ◽  
Zhong-ping Wang ◽  
Shuang-xi Zhou ◽  
...  
Keyword(s):  
Bayesian Inference ◽  
Evaluation Model ◽  
Bayes Theorem ◽  
Damage Evaluation ◽  
Mcmc Method ◽  
Initial Value ◽  
Long Span ◽  
Long Span Bridge ◽  
Proposed Model ◽  
Analytical Expressions

With the increase of the long-span bridge, the damage of the long-span bridge hanger has attracted more and more attention. Nowadays, the probability statistics method based on Bayes’ theorem is widely used for evaluating the damage of bridge, that is, Bayesian inference. In this study, the damage evaluation model of bridge hanger is established based on Bayesian inference. For the damage evaluation model, the analytical expressions for calculating the weights by finite mixture (FM) method are derived. In order to solve the complex analytical expressions in damage evaluation model, the Metropolis-Hastings (MH) sampling of Markov chain Monte Carlo (MCMC) method was used. Three case studies are adopted to demonstrate the effect of the initial value and the applicability of the proposed model. The result suggests that the proposed model can evaluate the damage of the bridge hanger.

scholarly journals Dynamic Bayesian network-based system-level evaluation on fatigue reliability of orthotropic steel decks

2019 ◽  
Vol 105 ◽  
pp. 1212-1228 ◽  
Author(s):  
Junlin Heng ◽  
Kaifeng Zheng ◽  
Sakdirat Kaewunruen ◽  
Jin Zhu ◽  
Charalampos Baniotopoulos
Keyword(s):  
Bayesian Network ◽  
Dynamic Bayesian Network ◽  
System Level ◽  
Fatigue Reliability ◽  
Orthotropic Steel Decks

A predictive critical flutter wind speed modeling for long-span bridges

2020 ◽  
Vol 23 (9) ◽  
pp. 1823-1837
Author(s):  
Kun Lin ◽  
Minghai Wei ◽  
Hongjun Liu ◽  
Huafeng Wang
Keyword(s):  
Wind Speed ◽  
Wind Tunnel ◽  
Dimensional Space ◽  
Three Dimensional ◽  
Wind Tunnel Tests ◽  
Long Span Bridges ◽  
Wind Speeds ◽  
Long Span ◽  
Aerodynamic Model ◽  
Proposed Model

In this article, a two-dimensional Lighthill aerodynamic model is first extended to three-dimensional space, and then combined with the larger Von Karman plate deformation theory, a model for predicting the critical flutter wind speeds of long-span bridges in the primary design is proposed. The predictions of the presented model are compared to the results of wind tunnel tests for five long-span bridges with different main girder section forms. After that, based on the proposed model, the effects of width to span ratio and thickness to span ratio on the critical flutter wind speeds of long-span bridges are investigated. The results show that the differences between the proposed model and wind tunnel tests are only 7%–14%. Therefore, the presented model can assess the flutter wind speed in preliminary design stages of a bridge. The results also reveal that width to span ratios between 1/30 and 1/10 and thickness to span ratios between 1/300 and 1/100 are optimal for long-span bridges.

scholarly journals Theoretically optimal forms for very long-span bridges under gravity loading

2018 ◽  
Vol 474 (2217) ◽  
pp. 20170726 ◽  
Author(s):  
Helen E. Fairclough ◽  
Matthew Gilbert ◽  
Aleksey V. Pichugin ◽  
Andy Tyas ◽  
Ian Firth
Keyword(s):  
Bridge Deck ◽  
Optimization Procedure ◽  
Layout Optimization ◽  
The Self ◽  
Minimum Volume ◽  
Structural Elements ◽  
Optimal Form ◽  
Long Span Bridges ◽  
Cable Stayed Bridge ◽  
Long Span

Long-span bridges have traditionally employed suspension or cable-stayed forms, comprising vertical pylons and networks of cables supporting a bridge deck. However, the optimality of such forms over very long spans appears never to have been rigorously assessed, and the theoretically optimal form for a given span carrying gravity loading has remained unknown. To address this we here describe a new numerical layout optimization procedure capable of intrinsically modelling the self-weight of the constituent structural elements, and use this to identify the form requiring the minimum volume of material for a given span. The bridge forms identified are complex and differ markedly to traditional suspension and cable-stayed bridge forms. Simplified variants incorporating split pylons are also presented. Although these would still be challenging to construct in practice, a benefit is that they are capable of spanning much greater distances for a given volume of material than traditional suspension and cable-stayed forms employing vertical pylons, particularly when very long spans (e.g. over 2 km) are involved.

Numerical simulation of wind-induced forces on bridge deck sections of long-span bridges

1997 ◽  
Vol 62 (4) ◽  
pp. 667-679 ◽  
Author(s):  
O.U. Onyemelukwe ◽  
M.A.M. Torkamani ◽  
H.R. Bosch
Keyword(s):  
Numerical Simulation ◽  
Bridge Deck ◽  
Long Span Bridges ◽  
Long Span

Supply Chain Risk Evaluation Based on Bayesian Network

2013 ◽  
Vol 680 ◽  
pp. 550-553
Author(s):  
Bo Chao Liu
Keyword(s):  
Risk Assessment ◽  
Supply Chain ◽  
Bayesian Network ◽  
Risk Evaluation ◽  
Evaluation Model ◽  
Assessment Model ◽  
Risk Assessment Model ◽  
Supply Chain Risk ◽  
Logistics Company ◽  
Proposed Model

The evaluation for supply chain risk is very important to show the latent risk and eliminate the risk. In the study, Bayesian network is proposed to evaluate the supply chain risk. The assessment indexes of supply chain risk are analyzed before supply chain risk assessment. Then, the assessment indexes of supply chain risk can be used to construct the supply chain risk assessment model. We apply a certain logistics company to study the evaluation ability of Bayesian network evaluation model proposed here. The experimental results prove the effectiveness of the proposed model.

Control of Vibrations due to Moving Loads on Suspension Bridges

2006 ◽  
Vol 11 (3) ◽  
pp. 293-318 ◽  
Author(s):  
M. Zribi ◽  
N. B. Almutairi ◽  
M. Abdel-Rohman
Keyword(s):  
Bridge Deck ◽  
Suspension Bridge ◽  
Lyapunov Theory ◽  
Dynamic Responses ◽  
Suspension Bridges ◽  
Control Force ◽  
Moving Loads ◽  
Hydraulic Actuator ◽  
Long Span ◽  
Suspended Cables

The flexibility and low damping of the long span suspended cables in suspension bridges makes them prone to vibrations due to wind and moving loads which affect the dynamic responses of the suspended cables and the bridge deck. This paper investigates the control of vibrations of a suspension bridge due to a vertical load moving on the bridge deck with a constant speed. A vertical cable between the bridge deck and the suspended cables is used to install a hydraulic actuator able to generate an active control force on the bridge deck. Two control schemes are proposed to generate the control force needed to reduce the vertical vibrations in the suspended cables and in the bridge deck. The proposed controllers, whose design is based on Lyapunov theory, guarantee the asymptotic stability of the system. The MATLAB software is used to simulate the performance of the controlled system. The simulation results indicate that the proposed controllers work well. In addition, the performance of the system with the proposed controllers is compared to the performance of the system controlled with a velocity feedback controller.

Alternate Designs for Long Span Bridges

PCI Journal ◽  
1980 ◽  
Vol 25 (4) ◽  
pp. 48-58
Author(s):  
Felix Kulka
Keyword(s):  
Long Span Bridges ◽  
Long Span
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