Experimental study on torsional behavior of spatial main cable for a self-anchored suspension bridge

Li, Chuanxi; You, Li; He, Jun

doi:10.1177/1369433219857840

Cited by 5 publications

(3 citation statements)

References 13 publications

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“…The main cable is vital for a suspender bridge in transferring dead and live loads from bridge decks to the main tower. The main cable in the suspender bridges is usually made of high-strength steel wires, which are very easy to deform under constructing and serving loads [1][2][3]. The incompatible deformation of steel wires would change the curve line of the main cable, bringing unexpected cable torsions and stress redistributions among the wires.…”

Section: Introductionmentioning

confidence: 99%

Investigation of torsion angle measurement method in spatial cables of suspension bridges

Xiao,

Wu,

Cao

et al. 2023

Vib. proced.

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Spatial cables in suspension bridges may twist between two adjacent suspension points due to transverse tension. To determine the spatial torsion angle of the cables, a scale-reduced suspender bridge model was fabricated and tested in this study. The cable torsion angles of the bridge model under different loading cases were obtained and presented. Theoretical methods (e.g., the coordinate method and the angle method) to calculate the spatial cable torsion angle in the suspender bridge were developed by analyzing the deforming characteristics of the suspender cables. The feasibility and predictive accuracy of the proposed methods were assessed using the experimental results. Results show that the proposed coordinate and angle methods produced similar torsion angles for the main cables, showing a maximum relative error of 10.4 %. Compared to the coordinate method's complex data transformation and measurement procedures, the angle method is more convenient, efficient, and easier to calculate the torsion angle of the main cable. Despite the capability of calculating the spatial cable torsion angles, the coordinate method also exhibits advanced capability in determining the geometric curves of the main cable under different spatial angles.

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Section: Introductionmentioning

confidence: 99%

Investigation of torsion angle measurement method in spatial cables of suspension bridges

Xiao,

Wu,

Cao

et al. 2023

Vib. proced.

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“…On the other hand, Camo proposed a probabilistic method to evaluate the safety reliability of the main cable [4] Cremona proposed a probabilistic method to estimate the residual strength of the cable steel wire, which had been used to evaluate the safety performance of the main cable of the Tangcaville Bridge [5]. Structural health monitoring (SHM) technology has been successfully applied to understand the loads, environment actions, and behaviors of a structure, thereby facilitating a new channel to evaluate the performance of main cables [6].…”

Section: Introductionmentioning

confidence: 99%

Long-Term Performance Evaluation of Main Cable for Large Span Suspension Bridge Based on ARIMA Model

Xu¹,

Ma²,

Cui³

2021

Advances in Transdisciplinary Engineering

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Main cables are major load-bearing components and play a decisive role in the long-term performance of suspension bridges. In particular, the wide application of health monitoring systems in large-span bridges facilitates a new channel for the performance evaluation of bridges. Under this context, Xihoumen Bridge is taken as the engineering research background. The long-term performance of the bridge’s main cable was evaluated by analyzing the main cable strand force data from January 2015 to October 2020, which was collected by the anchor rope meter. Firstly, the difference calculation was performed on the basis of the modeling theory of stationary time series to realize the stationary process of the original time series. Then, the Autoregressive Integrated Moving Average (ARIMA) model is established to predict the main cable strand force of the Xihoumen Bridge by model order estimation and parameter identification. Finally, the load degree index is defined in the discussion part to evaluate the long-term performance and determine the performance grading of the main cable.

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“…Orthotropic steel decks (OSDs) are widely used in cable supported bridges and girder bridges due to their light weight and the short onsite construction time [1][2][3]. However, several types of fatigue cracks occur at the edges of added holes and at welded joints in OSD bridges [4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Retrofit Fatigue Cracked Diaphragm Cutouts Using Improved Geometry in Orthotropic Steel Decks

Chen

et al. 2020

Applied Sciences

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Diaphragm cutouts are set to release redundant constraints and hence reduce weld fatigue at the connection of U-ribs to diaphragms in orthotropic steel decks. However, most fatigue cracks which originate from the edge of cutouts are in fact detected in the diaphragms. Therefore, a retrofit technology on cracked cutouts at the diaphragm is proposed and applied to the orthotropic steel box girder of a suspension bridge. Firstly, the stress concentration on the cutout is analyzed through refined finite element analyses. Furthermore, the fatigue cracked cutouts are retrofitted by changing their geometrical parameters. Thereafter, an optimized geometry and the size of diaphragm cutouts were confirmed and applied in the rehabilitation of a suspension bridge. On-site wheel load tests were carried out before and after retrofitting of the diaphragm cutout. The stress distributions along the edges of the cutouts and at the side of a diaphragm were measured under a moving vehicle. The stress spectra at two critical locations on the edge of a cutout was obtained under longitudinally and laterally moving vehicles. Finally, the fatigue life of the cutouts is assessed by the modified nominal stress method. The analytical and test results indicate that the wheel loads on the deck transmit stress to the diaphragms through the U-ribs, during the load transmission process, the stress flow is obstructed by diaphragm cutouts, resulting in local stress concentrations around the cutouts. In addition, the overall size of the cutouts should be small, but the radius of the transition arc should be large, thus the stress flow will not be obviously obstructed. After the retrofitting of the cutouts by improved geometry, the maximum stress decreases by 87.6 MPa, which is about 40% of the original stress. The equivalent constant amplitude stress is reduced by 55.2% when the lateral position of the wheel loads is taken into consideration. Based on the stresses obtained by finite element analysis (FEA) and experimental tests, the fatigue lives of the original cutouts are 1.7 and 4.9 years, respectively, which increase to 78.1 and 155.5 years, respectively, after the cutouts were retrofitted, which indicates that the improved geometry and retrofit technology can enhance the fatigue performance and extend the fatigue life of diaphragm cutouts with fatigue cracks.

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Experimental study on torsional behavior of spatial main cable for a self-anchored suspension bridge

Cited by 5 publications

References 13 publications

Investigation of torsion angle measurement method in spatial cables of suspension bridges

Investigation of torsion angle measurement method in spatial cables of suspension bridges

Long-Term Performance Evaluation of Main Cable for Large Span Suspension Bridge Based on ARIMA Model

Retrofit Fatigue Cracked Diaphragm Cutouts Using Improved Geometry in Orthotropic Steel Decks

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