Shake-table tests and numerical simulation of an innovative isolation system for highway bridges

Li, Jianzhong; Xiang, Nailiang; Hu, Tang; Guan, Zhongguo

doi:10.1016/j.soildyn.2016.05.002

Cited by 56 publications

(19 citation statements)

References 18 publications

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“…e verification of a mathematical model is a key step for the simulation research [55,56]. e shaking table test in reference [57] was analyzed by numerical simulation in this paper, in order to verify the correctness of the numerical model adopted in this paper. A two-span simply supported bridge model was built, as shown in Figure 7(a), with a 30 m long span and an 880 ton girder.…”

Section: Verificationmentioning

confidence: 99%

Study on the Seismic Performance of Different Combinations of Rubber Bearings for Continuous Beam Bridges

Wang

2020

Advances in Civil Engineering

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Rubber isolation bearings have been proven to be effective in reducing the seismic damage of bridges. Due to the different characteristics of isolation bearings, the mechanical properties of bridges with different combinations of rubber bearings are complex under the action of earthquakes. This paper focuses on the application of combinations of rubber isolation bearings on seismic performance of continuous beam bridges with T-beams. The seismic performances of continuous beam bridges with different combinations of rubber isolation bearings, pier height, and span length were studied by the dynamic time history analysis method. It was found that the bridges with natural rubber bearings (NRBs) have the largest seismic responses compared to the other types of bearings. The continuous beam bridge with isolation bearings, such as lead rubber bearings (LRBs) and high damping rubber bearings (HDRBs), has approximately 20%∼30% smaller seismic response than that with NRBs under the action of earthquakes due to the hysteretic energy of the bearings, indicating that the isolation bearings improve the seismic performance of the bridge. The continuous beam bridges with both NRBs and LRBs or NRBs and HDRBs have larger seismic response of the piers than those with a single type of isolation bearings (LRBs or HDRBs) but smaller seismic response of the piers than those with only NRBs. For a continuous beam bridge with shorter span and lower pier, it is not economical to use LRBs or HDRBs underneath every single girder, but it is more reasonable to use cheaper NRBs underneath some girders. The larger difference in stiffness of the bearings between the side and middle piers leads to the more unbalanced seismic response of each pier of the bridge structure. The results also show that with increasing pier height and span length, the difference in the seismic response value between the cases gradually increases.

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Section: Verificationmentioning

confidence: 99%

Study on the Seismic Performance of Different Combinations of Rubber Bearings for Continuous Beam Bridges

Wang

2020

Advances in Civil Engineering

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“…e bearings possess the capacity to sustain large vertical loads and accommodate the thermal movements of the superstructure with little or no maintenance requirements. Laminated-rubber bearings are used to support the superstructures, and the friction force is the only horizontal resisting force provided at the supports [5,6]. Once the seismic force exceeds the friction force, sliding leads to potentially large displacements.…”

Section: Introductionmentioning

confidence: 99%

Seismic Study of Skew Bridge Supported on Laminated‐Rubber Bearings

Liu

Guo

et al. 2020

Advances in Civil Engineering

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Skew bridges consisting of simply supported girders, continuous decks, and laminated-rubber bearings are widely used in western China; however, they are highly vulnerable to strong earthquakes. To investigate the seismic performance of skew bridges considering the sliding behavior of laminated-rubber bearings, the Duxiufeng Bridge located in Sichuan, China, was used as a prototype bridge. This bridge is a skew bridge that suffered seismic damage during the 2008 Wenchuan earthquake. The possible seismic response of this skew bridge under the Wenchuan earthquake was simulated, and the postearthquake repair methods were analyzed considering the effects of bearing types and cable restrainers. Parametric studies, using the finite element method, were also performed to investigate the effects of the skew angle and friction coefficient of the bearings on the seismic response of the skew bridge. The results indicate that pin-free bearings could effectively control the seismic displacement of the bridge, and the cable restrainers with an appropriate stiffness could significantly reduce the longitudinal residual displacements. The effect of skew angles is less significant on skew bridges with laminated-rubber bearings than on rigid-frame skew bridges because of the sliding between the girders and bearings. The residual displacements of the bearings were more sensitive to the variation in the friction coefficient between the laminated-rubber bearings and the girders compared to the maximum seismic displacements.

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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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Shake-table tests and numerical simulation of an innovative isolation system for highway bridges

Cited by 56 publications

References 18 publications

Study on the Seismic Performance of Different Combinations of Rubber Bearings for Continuous Beam Bridges

Study on the Seismic Performance of Different Combinations of Rubber Bearings for Continuous Beam Bridges

Seismic Study of Skew Bridge Supported on Laminated‐Rubber Bearings

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

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