Experimental Study on Seismic Performance of Concrete Continuous Bridge with HDR Bearings

Li, Yale; Zong, Zhouhong; Yang, Bingwen

doi:10.1007/s40030-020-00438-4

Cited by 4 publications

(7 citation statements)

References 19 publications

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“…Based on its good isolation characteristics, it can be further designed to control the collapse of the structure. The earthquake damage of the bridge can be effectively reduced by utilizing the comprehensive performance of the HDR bearing [41]. In addition, the cost of HDR bearings is not high, the environmental impact is small, and the damping is less influenced by the temperature [42].…”

Section: Hdr Bearing Isolation and Collapse Controlmentioning

confidence: 99%

“…Finally, the natural frequencies of the bridge specimens in longitudinal, transverse, and vertical directions were obtained and used for model updating. Take bridge specimens with HDR bearings (CHDR system) for example, the finite element model parameters of this system were updated based on the measured longitudinal vibration frequency [41] of the first three orders. In order to prove the effectiveness of the model modification, modal analysis was developed to acquire the longitudinal, horizontal, and vertical frequencies which were calculated frequencies in Table 2.…”

Section: Analysis Model and Model Updatingmentioning

confidence: 99%

“…The results of the modified finite element model agreed well with the experimental values (see Table 3), thus the finite element model could be used as a computational model for collapse analysis. example, the finite element model parameters of this system were updated based on the measured longitudinal vibration frequency [41] of the first three orders. In order to prove the effectiveness of the model modification, modal analysis was developed to acquire the longitudinal, horizontal, and vertical frequencies which were calculated frequencies in Table 2.…”

Section: Analysis Model and Model Updatingmentioning

confidence: 99%

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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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Section: Hdr Bearing Isolation and Collapse Controlmentioning

confidence: 99%

Section: Analysis Model and Model Updatingmentioning

confidence: 99%

Section: Analysis Model and Model Updatingmentioning

confidence: 99%

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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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“…Among the seismic performance of a continuous beam bridge, traffic safety is of great concern [1,2]. In recent years, rubber materials have been widely used for the bearings of bridges because of their excellent deformation characteristics.…”

Section: Introductionmentioning

confidence: 99%

“…Numerous studies have proved the efficiency of rubber bearings in reducing the seismic-induced forces of bridge systems [9,10]. e common types of rubber isolation bearings include low damping natural rubber bearings (LDRs) [1], natural rubber bearings (NRBs) [3,6], lead rubber bearings (LRBs) [7], and high damping rubber bearings (HDRBs) [2,8]. At present, the seismic performance of the aseismic bearings for continuous beam bridges is mainly studied for the mechanical behavior of various rubber bearings under earthquakes [11,12], by utilizing the finite element method and shaking table test methods [13][14][15][16].…”

Section: Introductionmentioning

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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Seismic behavior of the main girder of a bridge with viscoelastic dampers

2021

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Introduction. The seismic stability of bearing structures is one of the main objectives of design and construction of structures in earthquake areas. The co-authors have analyzed the effect of a damper, located at the intersection of structural elements, on the seismic response of the main girder of a steel-concrete bridge exposed to the seismic impact. The purpose of this study is to select optimal values of viscous and elastic elements to ensure the seismic resistance of the bridge. Materials and methods. The finite element method was used to simulate the geometric characteristics of the bridge. The model of the bridge has rod elements to simulate girders and viscous elastic elements to simulate dampers. In the study, different values of elastic and viscous characteristics of the damper were used in pairs. The nonlinear problem statement helped to analyze the bridge structure using the direct dynamic method. Results. As a result, we obtained a graphic chart describing the relationship between horizontal displacements and the time for each pair of values of elastic and viscous characteristics of the damper for Maxwell and Kelvin – Voigt models. The effect of changes in the values of stiffness and damping parameters on the values of the period and eigenfrequencies of this superstructure was also investigated. Conclusions. The co-authors chose the damper parameters to minimize seismic displacements of the bridge girder and optimally suppress the dynamic interaction between the bridge elements. Viscoelastic elements of the Kelvin – Voigt type provide more regular values of horizontal displacements of the girder when the direction of the seismic effect changes. We also recommend to select the pair of values equal to 20 000 kN/m, 800 kN s/m, and to use the Kelvin – Voigt model in the design of a viscoelastic damper.

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Experimental Study on Seismic Performance of Concrete Continuous Bridge with HDR Bearings

Cited by 4 publications

References 19 publications

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

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

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

Seismic behavior of the main girder of a bridge with viscoelastic dampers

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