Monitored structural behavior of a long span cable-stayed bridge under environmental effects

2018 ◽  
Vol 4 (4) ◽  
pp. 137 ◽  
Author(s):  
Alemdar Bayraktar ◽  
Ashraf Ashour ◽  
Halil Karadeniz ◽  
Altok Kurşun ◽  
Arif Erdiş
Keyword(s):  
Air Temperature ◽  
Environmental Effects ◽  
Monitoring Data ◽  
Structural Behavior ◽  
Steel Cable ◽  
Daily Monitoring ◽  
Cable Stayed Bridge ◽  
Long Span ◽  
Cable Forces ◽  
Cable Stayed Bridges

An accurate numerical analysis of the behavior of long-span cable-stayed bridges under environmental effects is a challenge because of complex, uncertain and varying environmental meteorology. This study aims to investigate in-situ experimental structural behavior of long-span steel cable-stayed bridges under environmental effects such as air temperature and wind using the monitoring data. Nissibi cable-stayed bridge with total length of 610m constructed in the city of Adıyaman, Turkey, in 2015 is chosen for this purpose. Structural behaviors of the main structural elements including deck, towers (pylons) and cables of the selected long span cable-stayed bridge under environmental effects such as air temperature and wind are investigated by using daily monitoring data. The daily variations of cable forces, cable accelerations, pylon accelerations and deck accelerations with air temperature and wind speed are compared using the hottest summer (July 31, 2015) and the coldest winter (January 1, 2016) days data.

A prediction method for cable forces of cable-stayed bridges using fuzzy processing and Bayes estimation

2021 ◽  
Author(s):  
Li Dong ◽  
Bin Xie ◽  
Dongli Sun ◽  
Yizhuo Zhang
Keyword(s):  
Prediction Method ◽  
Practical Method ◽  
Bayes Estimation ◽  
Primary Data ◽  
Force Estimation ◽  
Element Analysis ◽  
Cable Stayed Bridge ◽  
Input Parameters ◽  
Cable Forces ◽  
Cable Stayed Bridges

<p>Cable forces are primary factors influencing the design of a cable-stayed bridge. A fast and practical method for cable force estimation is proposed in this paper. For this purpose, five input parameters representing the main characteristics of a cable-stayed bridge and two output parameters representing the cable forces in two key construction stages are defined. Twenty different representative cable-stayed bridges are selected for further prediction. The cable forces are carefully optimized through finite element analysis. Then, discrete and fuzzy processing is applied in data processing to improve their reliability and practicality. Finally, based on the input parameters of a target bridge, the maximum possible output parameters are calculated by Bayes estimation based on the processed data. The calculation results show that the average prediction error of this method is less than 1% for the twenty bridges themselves, which provide the primary data and less than 3% for an under-construction bridge.</p>

Mechanical Features of Cable-Girder Anchorage for Long-Span Railway Cable-Stayed Bridge with Steel Box Girders

2014 ◽  
Vol 587-589 ◽  
pp. 1391-1394 ◽  
Author(s):  
Chao Yi Yao ◽  
Qian Hui Pu ◽  
Ya Dong Yao
Keyword(s):  
Stress Distribution ◽  
Rational Design ◽  
Load Transfer ◽  
Rapid Development ◽  
Transfer Mechanism ◽  
Complex Load ◽  
Cable Stayed Bridge ◽  
Long Span ◽  
Load Transfer Mechanism ◽  
Cable Stayed Bridges

The cable-stayed bridge got rapid development in recent years. And for long-span cable-stayed bridges, the cable-girder anchorage structure is a key component in designing. The function of the cable-girder anchorage structure is to transfer the load between cables and the main girder. With the complex load transfer mechanism and stress concentration induced by large cable force, rational design of cable-girder anchorage structure is critical to long-span cable-stayed bridges. Take a certain long-span railway cable-stayed bridge in Zhejiang Province as the investigation, the load transfer mechanism and the stress distribution state was studied by finite element model. The research indicated that the design of this anchor box was rational. The stress distribution on each plate of the anchor box was relatively uniform. And the load transfer path and mechanisms of the main components of this anchor box were clear.

Analysis of Pylon Anchorage Zone of Cable-Stayed Bridge

2014 ◽  
Vol 501-504 ◽  
pp. 1125-1128
Author(s):  
Liang Liang Zhai
Keyword(s):  
Type Structure ◽  
Construction Technology ◽  
Analysis Method ◽  
Finite Element Program ◽  
Cable Stayed Bridge ◽  
Long Span ◽  
Element Program ◽  
Force Characteristics ◽  
Major General ◽  
Cable Stayed Bridges

For long-span cable-stayed bridge, the stress of pylon anchorage zone is complex. For the construction technology personnel, the research on the force characteristics of anchorage zone can offer a theoretical base to organize construction better. This paper makes a further study for the stress of tower anchorage zone of two cable-stayed bridges with different anchor forms by using major general finite element program ANSYS to analysis the force characteristics of anchorage zone in detail. The results provide a reference for construct and design the same type structure. The analysis method for same type structure is also worth learning.

scholarly journals Static and Dynamic Mechanical Properties of Long-Span Cable-Stayed Bridges Using CFRP Cables

2017 ◽  
Vol 2017 ◽  
pp. 1-11 ◽  
Author(s):  
Mei Kuihua ◽  
Sun Shengjiang ◽  
Jin Guoqing ◽  
Sun Yamin
Keyword(s):  
Vibration Frequency ◽  
Temperature Effects ◽  
Natural Vibration ◽  
Dynamic Performance ◽  
Design Parameters ◽  
Natural Vibration Frequency ◽  
Steel Cable ◽  
Cable Stayed Bridge ◽  
Steel Cables ◽  
Cable Stayed Bridges

The elastic modulus and deadweight of carbon fiber-reinforced polymer (CFRP) cables are different from those of steel cables. Thus, the static and dynamic behaviors of cable-stayed bridges using CFRP cables are different from those of cable-stayed bridges using steel cables. The static and dynamic performances of the two kinds of bridges with a span of 1000 m were studied using the numerical method. The effects of geometric nonlinear factors on static performance of the two kinds of cable-stayed bridges were analyzed. The live load effects and temperature effects of the two cable-stayed bridges were also analyzed. The influences of design parameters, including different structural systems, the numbers of auxiliary piers, and the space arrangement types of cable, on the dynamic performance of the cable-stayed bridge using CFRP cables were also studied. Results demonstrate that sag effect of the CFRP cable is much smaller than that of steel cable. The temperature effects of CFRP cable-stayed bridge are less than those of steel cable-stayed bridge. The vertical bending natural vibration frequency of the CFRP cable-stayed bridge is generally lower than that of steel cable-stayed bridge, whereas the torsional natural vibration frequency of the former is higher than that of the latter.

scholarly journals Effects in service of the staggered construction of cable-stayed bridges built on temporary supports

2015 ◽  
Vol 10 (3) ◽  
pp. 247-254 ◽  
Author(s):  
Jose Antonio Lozano-Galant ◽  
Ignacio Payá-Zaforteza ◽  
Jose Turmo
Keyword(s):  
Structural Response ◽  
Structural Behavior ◽  
Bending Energy ◽  
Steel Cable ◽  
Construction Stage ◽  
Construction Joints ◽  
Definition Of ◽  
Cable Stayed Bridges ◽  
Do So

Cable-stayed bridges can be rarely built on a single construction stage and staggered construction is commonly used. The effects of this staggered construction are not only economical as they might also play an important role in the structural behavior in service. Despite of this importance, these effects are rarely included into the definition of the structural response in service. In order to fill this gap, this paper deals with the effects in service of the staggered erection of steel cable-stayed bridges built on temporary supports. To do so, a criterion based on the minimization of the bending energy in terms of stay forces is applied to several cable-stayed bridges. This study shows the importance of the existence of the pylon-deck connection as well as the number and location of both construction joints and temporary supports during staggered erection.

Restoration of missing structural health monitoring data using spatiotemporal graph attention networks

2021 ◽  
pp. 147592172110568
Author(s):  
Jin Niu ◽  
Shunlong Li ◽  
Zhonglong Li
Keyword(s):  
Missing Data ◽  
Structural Health Monitoring ◽  
Health Monitoring ◽  
Low Cost ◽  
Monitoring Data ◽  
Structural Health ◽  
Long Span ◽  
Temporal Correlations ◽  
Spatial Dependencies ◽  
Cable Forces

For structural health monitoring systems with many low-cost sensors, missing data caused by sensor faults, power supply interruptions and data transmission errors are almost inevitable, significantly affecting structural diagnosis and evaluation. Considering the inherent spatial and temporal correlations in the sensor network, this study proposes a spatiotemporal graph attention network for restoration of missing data. The proposed model was stacked with a graph convolutional layer and several spatiotemporal blocks composed of spatial and temporal layers. The monitoring data of normal sensors were first mapped to all sensors through the graph convolutional layer, and attention mechanisms were used in the spatiotemporal blocks to model the spatial dependencies of sensors and the temporal dependencies of time steps, respectively. The extracted spatiotemporal features were assembled through a fully connected layer to reconstruct the missing signals. In this study, both homogeneous and heterogeneous monitoring items were used to calculate the spatial attention coefficients. The data restoration accuracy with and without the multi-source data fusion was discussed. Application on a long-span cable-stayed bridge to restore missing cable forces demonstrates that spatiotemporal attention modelling can achieve satisfactory restoring accuracy without any prior analysis.

Behavior of Super Long Span Cable-Stayed Bridges during the Construction

2011 ◽  
Vol 63-64 ◽  
pp. 474-477
Author(s):  
Peng Liang ◽  
Zhong Ping Qin ◽  
Guo Xing Wang
Keyword(s):  
Temporal Variation ◽  
Nonlinear Analysis ◽  
Spatial And Temporal Variation ◽  
Geometrically Nonlinear ◽  
Construction Process ◽  
Geometrically Nonlinear Analysis ◽  
Cable Stayed Bridge ◽  
Long Span ◽  
Cable Stayed Bridges

In order to accurately reflect the effects and the spatial and temporal variation of long span cable-stayed bridge during the construction process, this paper, based on total CR formulation and the catenary cable element, improves the existing methods of geometrically nonlinear analysis and then develops a new software for nonlinear analysis of bridge through the entire construction.

Seismic Displacements Reduction for a Long-Span Cable-Stayed Bridge

2011 ◽  
Vol 255-260 ◽  
pp. 840-845
Author(s):  
Xi Wen Yang ◽  
Zi Bao Lian
Keyword(s):  
Inertial Force ◽  
Center Of Gravity ◽  
Shear Forces ◽  
Viscous Dampers ◽  
Cable Stayed Bridge ◽  
Long Span ◽  
Seismic Shear ◽  
Seismic Displacements ◽  
Floating Systems ◽  
Cable Stayed Bridges

Floating or semi-floating systems are usually employed for long-span cable-stayed bridges to lengthen their fundamental periods, and accordingly, to reduce their seismic inertial force, but the structures’ seismic displacements could be increased by utilizing these systems. Taking Yong-jiang railway cable-stayed bridge which has a low center of gravity as engineering background, the function of viscous dampers in controlling seismic displacements is studied. Firstly, the rational parameters of dampers are determined by parametric analysis, and then the seismic displacements and forces of the bridge, utilizing and un-utilizing viscous dampers, are compared. The results show that: viscous dampers are efficient in controlling seismic displacements of the bridge; the seismic shear forces at the bottom of towers are reduced slightly and the corresponding moments are reduced in a larger extent for cable-stayed bridge with low center of gravity.

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