Failure Mechanism of Expansion Joints in a Suspension Bridge

Sun, Zhen; Zhang, Yufeng

doi:10.1061/(asce)be.1943-5592.0000942

Cited by 45 publications

(14 citation statements)

References 26 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…where A is the maximum of cable vertical deflection. Substituting Equations ( 4) and (5) to Equation (3), Equation (3) will be rewritten as…”

Section: Static Longitudinal Behavior Under Vertical Loadsmentioning

confidence: 99%

See 1 more Smart Citation

Girder Longitudinal Movement and Its Factors of Suspension Bridge under Vehicle Load

Huang

Li³

et al. 2021

Advances in Civil Engineering

View full text Add to dashboard Cite

Vehicle load may not only cause vertical deformation and vibration of suspension bridge but also lead to longitudinal deformation and vibration. And the longitudinal behavior is closely related to the durability of the girder end devices and the bending fatigue failure of suspenders. In this study, the longitudinal deformation behavior and longitudinal vibration of suspension bridge under vehicles, as well as the related influencing factors, are investigated. The underlying mechanism of girder longitudinal movement under the moving vehicles is revealed. Based on the simplified vehicle model of vertical concentrated force, the characteristics of main cable deformation and girder longitudinal displacement under vertical loads are analyzed first. Then, the longitudinal motion equation of the girder under vertical moving loads is derived. Finally, a single long-span suspension bridge is employed in the case study, and the girder longitudinal response and influencing factors are investigated based on both numerical simulation and field monitoring. Results indicate that the asymmetric vertical load leads to cable longitudinal deflection owing to the geometrically nonlinear characteristic of the main cable, leading to longitudinal movement of the girder. The results of field monitoring and numerical simulation indicate that the girder moves quasi-statically and reciprocates longitudinally with centimeter amplitude under normal operational loads.

show abstract

“…where A is the maximum of cable vertical deflection. Substituting Equations ( 4) and (5) to Equation (3), Equation (3) will be rewritten as…”

Section: Static Longitudinal Behavior Under Vertical Loadsmentioning

confidence: 99%

“…e huge accumulative displacement caused by traffic or wind loads during the operational stage is an important reason for the damage of the end attached facilities [2][3][4][5].…”

Section: Introductionmentioning

confidence: 99%

Girder Longitudinal Movement and Its Factors of Suspension Bridge under Vehicle Load

Huang

Li³

et al. 2021

Advances in Civil Engineering

View full text Add to dashboard Cite

show abstract

“…According to existing research, the service life of bridge accessories, such as expansion joints and FVDs, is closely related to the deformation and fatigue properties of the components under external loads [35]. An accumulative friction slide distance that exceeds the design value is an important precipitating factor, and also it will lead to component damage in which traffic flow accounts for most of the accumulative displacement.…”

Section: Fvd Effect Under Traffic Flowmentioning

confidence: 99%

Influence of Fluid Viscous Damper on the Dynamic Response of Suspension Bridge under Random Traffic Load

Zhao

Huang

Long

et al. 2020

Advances in Civil Engineering

View full text Add to dashboard Cite

Fluid viscous dampers (FVDs) are widely used in long-span suspension bridges for earthquake resistance. To analyze efficiently the influences of FVDs on the dynamic response of a suspension bridge under high-intensity traffic flow, a bridge-vehicle coupling method optimized by isoparametric mapping and improved binary search in this work was first developed and validated. Afterwards, the traffic flow was simulated on the basis of monitored weigh-in-motion data. The dynamic responses of bridge were analyzed by the proposed method under different FVD parameters. Results showed that FVDs could positively affect bridge dynamic response under traffic flow. The maximum accumulative longitudinal girder displacement, longitudinal girder displacement, and longitudinal pylon acceleration decreased substantially, whereas the midspan girder bending moment, pylon bending moment, longitudinal pylon displacement, and suspender force were less affected. The control efficiency of maximum longitudinal girder displacement and accumulative girder displacement reached 33.67% and 57.71%, longitudinal pylon acceleration and girder bending moment reached 31.51% and 7.14%, and the pylon longitudinal displacement, pylon bending moment, and suspender force were less than 3%. The increased damping coefficient and decreased velocity exponent can reduce the bridge dynamic response. However, when the velocity exponent was 0.1, an excessive damping coefficient brought little improvement and may lead to high-intensity work under traffic flow, which will adversely affect component durability. The benefits of low velocity exponent also reduced when the damping coefficient was high enough, so if the velocity exponent has to be increased, the damping coefficient can be enlarged to fit with the velocity exponent. The installation of FVDs influences dynamic responses of bridge structures in daily operations and this issue warrants investigation. Thus, traffic load should be considered in FVD design because structural responses are perceptibly influenced by FVD parameters.

show abstract

“…e impact effect of MBEJ vertical vibration is the main reason for the failure of center beam weld [3]. e horizontal vibration mainly affects the safety of the connection between the bridge deck and the MBEJ and the service life of the sliding bearing [4][5][6]. e research by Shun et al [7] on the interaction between vertical vibration and horizontal vibration of MBEJs showed that the vibrations in two directions are independent of each other, so they can be studied separately.…”

Section: Introductionmentioning

confidence: 99%

Dynamic Response of a Vehicle-Bridge Expansion Joint Coupled System

Zhang

Wang

2022

Shock and Vibration

View full text Add to dashboard Cite

The paper investigates the dynamic vibration property of the vehicle-bridge expansion joint coupled system with the proposed model. The dynamic response of the expansion joint under the action of the vehicle is the key factor affecting the life of the expansion joint. The changes of contact state and tire geometric characteristics were frequently left aside in the past to simplify the tire model. This is because the contact between tire and expansion joint is a very complex process. But this will seriously underestimate the impact effect of the vehicle on the expansion joint. In this paper, a dynamic mathematical model of the 2-axle vehicle-modular bridge expansion joint (MBEJ) coupled system is established by introducing a flexible roller tire model. The influence of tread rigid displacement and change in the tire contact patch length are considered in the dynamic model. Based on this model, the characteristics of the dynamic tire load and the center beam vibration displacement in the coupled system are obtained by simulation. The results show that the maximum dynamic tire load of the vehicle occurs at the end of the bridge deck behind the MBEJ, so local structure reinforcement needs to be considered. The interaction between the front and rear wheels of the 2-axle vehicle can be ignored. The vehicle position, vehicle velocity, gap width, and spring stiffness of the center beam bearing have significant effects on the impact factors of tire load and center beam vibration displacement. The impact factor of tire load may exceed the recommended values of Chinese and European bridge codes. These should be taken seriously.

show abstract

Failure Mechanism of Expansion Joints in a Suspension Bridge

Cited by 45 publications

References 26 publications

Girder Longitudinal Movement and Its Factors of Suspension Bridge under Vehicle Load

Girder Longitudinal Movement and Its Factors of Suspension Bridge under Vehicle Load

Influence of Fluid Viscous Damper on the Dynamic Response of Suspension Bridge under Random Traffic Load

Dynamic Response of a Vehicle-Bridge Expansion Joint Coupled System

Contact Info

Product

Resources

About