Abstract
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.
Highlights
Fluid viscous dampers (FVDs) were first used in the machinery and military industries
Since FVDs are integrated with the bridge, they have various complex effects on bridge responses, such as girder displacement, pylon bending moment, and expansion joint displacement. e designation of optimum FVD parameters focuses on the response under earthquake excitation and has been investigated comprehensively. e research methods generally included numerical analyses, shake table tests, and data monitoring
FVDs can absorb and dissipate energy imported from wind and traffic flow because of their dissipation capacity. e working conditions of supports, expansion joints, and suspenders can be improved by considering the daily longitudinal girder displacement in determining FVD parameters; the frequent reciprocating motion of main girder can be effectively improved by using FVDs [10]
Summary
FVDs were first used in the machinery and military industries. On account of their excellent energy dissipating capacity, they have been applied in structural vibration control under earthquakes. Research shows that the dynamic responses of long-span suspension bridge under high winds and running trains are mainly influenced by strong winds when the wind is strong, but when the wind comes to low intensity, train load plays a decisive role in vertical displacement [11]. E specific influences of FVDs on the dynamic response of long-span suspension bridges under traffic load, which can be further referenced in the optimization of FVD parameters, should be analyzed. E full coupling analytical method has the advantages of clear physical meaning and high precision This method requires huge amount of time and lots of computing resources when applied to long-span bridges under large and highly random traffic flow. Is paper developed a vehicle-bridge interaction system with high efficiency to analyze the dynamic response of a bridge with FVDs under a large and highly random traffic flow. The responses of the large-span bridge under traffic flow with different parameters of FVDs were studied
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