Modeling and Separation of Thermal Effects from Cable-Stayed Bridge Response

Xu, Xiang; Huang, Qiao; Ren, Yuan; Zhao, Danyang; Yang, Juan; Zhang, Deyi

doi:10.1061/(asce)be.1943-5592.0001387

Cited by 59 publications

(30 citation statements)

References 21 publications

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“…e moisture distribution in the adhesive layer-concrete bonded zone is unavailable to measure. erefore, the nite element method (FEM) was applied to model the moisture di usion in the sandwiched four-point bending specimens [30,31]. Figure 3 shows the 3-dimensional geometrical model of the sandwiched four-point bending specimen.…”

Section: Finite Element Modelmentioning

confidence: 99%

Effects of Water Immersion on the Adhesion between Adhesive Layer and Concrete Block

Shi

Pan

et al. 2019

Advances in Civil Engineering

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The effectiveness of load transfer in the CFRP-adhesive-concrete system highly relies on the integrity of the interfacial bond between adhesive layer and concrete. In the present paper, the effects of water immersion on the mode I fracture energy of the adhesion between CFRP adhesive and concrete were investigated experimentally and numerically. Four-point bending test was conducted to measure the mode I fracture energy of the interfacial layer between adhesive and concrete. The moisture content distribution and the hygrothermal stress were determined by using the finite element method (FEM). The mode I fracture energy was found decreasing with increasing immersion time. The difference between the mode I fracture energy at 2 weeks and 4 weeks is rare. The failure mode of the four-point bending test specimen shifts from concrete failure to interfacial debonding. The moisture content at the adhesive/concrete interface reaches equilibrium after 2 weeks of water immersion. The hygrothermal stress between adhesive and concrete is smaller than the tensile strength of concrete. Deterioration of the physical bond leads to the degradation of bonding strength. The reduction of the mode I fracture energy is more severe than that of the mode II fracture energy.

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Section: Finite Element Modelmentioning

confidence: 99%

Effects of Water Immersion on the Adhesion between Adhesive Layer and Concrete Block

Shi

Pan

et al. 2019

Advances in Civil Engineering

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“…Note that long span bridges are generally designed to have a service life of 100 years or even longer and the cables are supposed to serve for more than 50 years. However, cable dampers normally have a shorter service life, roughly of 10 years, since they are subjected to dynamic loading due to cable vibrations and quasi‐static loading owing to traffic and temperature‐induced deck deflection . Therefore, it is of practical significance to develop low‐cost dampers with low‐maintenance requirements.…”

Section: Introductionmentioning

confidence: 99%

Multimode cable vibration control using a viscous‐shear damper: Case studies on the Sutong Bridge

Chen

et al. 2020

Struct Control Health Monit

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Summary This study investigates multimode damping effects of a long cable attached with a viscous‐shear damper (VSD). A typical VSD comprises a casing box containing viscous medium and shearing plates with parts submerged in the medium. It dissipates vibration energy through shear deformation of the viscous medium. The VSD is low‐cost and invulnerable to leakage or increasing joint play and hence requires low maintenance effort. For studying its damping effects on long cables, three VSDs were designed respectively for three long cables of the Sutong Bridge, a cable‐stayed bridge with a main span of 1,088 m, and then tested in laboratory under forced sinusoidal displacements with various frequencies and amplitudes. Their dynamic behaviors were found to be accurately modeled using a viscous damper with intrinsic stiffness, while the viscous and stiffness coefficients depend on frequency and amplitude. The VSDs were subsequently attached to the cables respectively, and modal damping ratios of in‐plane modes of each cable without dampers and with the VSD were measured by free‐decay testing. The measurements obtained for most in‐plane modes with frequency less than 3 Hz show that the VSD provides satisfactory multimode damping effects with efficiency factors between 30% and 50% as compared to an ideal viscous damper and the damping decreases slightly for higher modes. The measurements are also found consistent with the results of complex modal analysis of a shallow cable with a Kelvin–Voigt damper considering frequency‐ and amplitude‐dependent damper properties. Particularly, analytical prediction using the damper properties tested under small deformation amplitude provides the lower bound of the damping effect.

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“…The physical–mathematical demonstration for damage identification through changes in cable frequencies has been investigated (Lepidi et al, 2007). Xu et al (2019b) proposed an analytical method for the characteristics of cables with broken wire based on the microstructural mechanical model. The temperature effects on cable response have also been discussed (Lepidi and Gattulli, 2012).…”

Section: Introductionmentioning

confidence: 99%

“…Cables are one of the most important components for cable-stayed bridges to resist various actions in complex operational environment. Meanwhile, cables in bridge are facing threats resulting from their own performance degradations and aggressive operational environments (Xu et al, 2019b); cable anomalies may cause serious consequences for the whole bridge.…”

Section: Introductionmentioning

confidence: 99%

A cointegration approach for cable anomaly warning based on structural health monitoring data: An application to cable-stayed bridges

Fan

Huang

Ren

et al. 2020

Advances in Structural Engineering

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For long-span cable-stayed bridges, cables are one of the most important components to resist various actions. With the application of structural health monitoring technique, real-time recording of cable forces is achieved, and hence, the warning system on cable anomaly established. However, it is still difficult and there are challenges to conduct the warning system effectively, especially due to the phenomena of false alarm or omission. A practical reason is the warning index’s sensitivity to the ambient environment. Temperature variations, for instance, usually disturb the force-based cable anomaly warning and result in the false evaluation of structural condition. In view of eliminating the effects of environmental temperature, cointegration, a statistical concept from econometrics, is employed in cable anomaly warning studies. An approach that extracts warning index by linear combination of two non-stationary time series using the cointegration algorithm is developed in order to produce a more stationary cointegrated residual series (warning index series). The calculated stationary relationship between two time series is insensitive to the influence of environmental temperature and is capable of cable anomaly warning. Specifically, the framework of the cable anomaly warning system is first proposed. Subsequently, time-series test methods are introduced to check the non-stationary order and calculate the cointegration parameters of measured cable forces and environmental temperature. The computed cointegrated residual series is fed into statistical analysis as a warning index and the procedure of cable anomaly warning under the influence of environmental temperature is illustrated in detail. Finally, a case study for a cable-stayed bridge is demonstrated with results and discussions.

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Modeling and Separation of Thermal Effects from Cable-Stayed Bridge Response

Cited by 59 publications

References 21 publications

Effects of Water Immersion on the Adhesion between Adhesive Layer and Concrete Block

Effects of Water Immersion on the Adhesion between Adhesive Layer and Concrete Block

Multimode cable vibration control using a viscous‐shear damper: Case studies on the Sutong Bridge

A cointegration approach for cable anomaly warning based on structural health monitoring data: An application to cable-stayed bridges

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