System-based probabilistic optimization of fluid viscous dampers equipped in cable-stayed bridges

Zhong, Jue; Hu, Zhangliang; Yuan, Wancheng; Liang, Chen

doi:10.1177/1369433218756429

Cited by 27 publications

(9 citation statements)

References 31 publications

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“…e research methods generally included numerical analyses, shake table tests, and data monitoring [3][4][5]. Different techniques have been proposed by scholars to ascertain the optimal parameters that can achieve ideal structural response [6][7][8].…”

Section: Introductionmentioning

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

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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.

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Section: Introductionmentioning

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

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“…Shock absorption devices are mainly dampers, which can be divided into two types: deformation energy dissipation and velocity energy dissipation. The metal damper [17][18][19] is representative of the former, and the viscous fluid damper [20] is related to the speed of motion, which is the representative of the latter. Restraint devices include anti-fall beam devices such as block, shear tenon, and lock-up devices [21,22].…”

Section: Introductionmentioning

confidence: 99%

Research on Longitudinal Collapse Mode and Control of the Continuous Bridge under Strong Seismic Excitations

Zong

Yang

et al. 2020

Applied Sciences

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Bridge collapse events are common in major earthquakes around the world, among which continuous girder bridges are the most involved. In order to explore the collapse mechanism of a continuous girder bridge in an earthquake, the collapse mode of a two-span continuous girder bridge specimen which had been studied by the shaking table test was analyzed. Then, on the basis of the conventional plate rubber bearing system, the collapse control strategies which were high damping rubber bearing, fluid viscous damper, lock-up clutch control methods were discussed. It is found that high damping rubber bearing can delay the collapse time but the collapse mode remains the same; lock-up clutch has the best displacement control effect for the superstructure, but its energy consumption performance is not as good as that of a fluid viscous damper; high damping rubber bearing is quite suitable for protecting the substructure under short-period ground motion to avoid the bridge collapse caused by the failure of piers; fluid viscous damper and lock-up clutch are suitable for protecting the superstructure under long ground seismic motion to avoid the bridge non-use resulted from girder lowering; three collapse control methods can improve the anti-collapse ability of the bridge specimen, although no matter which control method is used, the bridge specimen may still collapse under strong earthquakes, but the target of postponing collapse time can be realized by means of various effective control methods.

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“…Both component-level and system-level fragilities have been developed for a class of bridges in a certain region, such as Central America [7,8], California, USA [9], Turkey [10], Greece [11], and Italy [12]. Barnawi and Dyke [13] and Zhong et al [14,15] evaluated the seismic fragility of a cable-stayed bridge and compared different retrofit measures using fragility techniques. Although their studies noted the necessity of derivation of system-level fragility of piers (towers) and bearings, a serial connection was used in estimating the system fragility.…”

Section: Introductionmentioning

confidence: 99%

Fragility‐Based Improvement of System Seismic Performance for Long‐Span Suspension Bridges

Wang

Qiu

2020

Advances in Civil Engineering

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In this study, a procedure is developed to evaluate and improve the seismic performance of long-span suspension bridges based on the performance objectives under the fragility function framework. A common type of suspension bridge in China was utilized in the proposed procedure, considering its approach structures according to earthquake damage experience and fortification criteria. Component-level fragility curves were derived by probabilistic seismic demand models (PSDMs) using a set of nonlinear time-history analyses that incorporated the related uncertainties such as earthquake motions and structural properties. In addition, one step that was covered was to pinpoint the capacity limit states of critical components including bearings, pylons, and columns. The stepwise improved seismic designs were proposed in terms of the component fragility results of the as-built design. Results of the comparison of improved designs showed that the retrofit measure of the suspension span should be selected based on two attributes, i.e., displacement and force, and the restraint system of the approach bridges was a key factor affecting the reasonable damage sequence. Necessarily, from the comparison of different system vulnerability models, the mean values of earthquake intensity of system-level fragility function developed by the composite damage state indices were used to assess the overall seismic performance of the suspension bridge. The results showed that compared to the absolutely serial and serial-parallel assumptions, the defined composite damage indices incorporating the thought of component classification and structural relative importance between the main bridge and approach structures were necessary and were able to derive a good indicator of seismic performance assessment, hence validating the point that the different damage states were dominated by the seismic demands of different structures for the retrofitted bridges.

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System-based probabilistic optimization of fluid viscous dampers equipped in cable-stayed bridges

Cited by 27 publications

References 31 publications

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

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

Research on Longitudinal Collapse Mode and Control of the Continuous Bridge under Strong Seismic Excitations

Fragility‐Based Improvement of System Seismic Performance for Long‐Span Suspension Bridges

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