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Seismic performance of composite rubber bearings for highway bridges: Bearing test and numerical parametric study
https://orcid.org/0000-0001-9100-6624
Highlights Composite rubber bearing (CRB) is proposed to improve bearing displacement capacity. Bearing tests have been conducted in both vertical and horizontal directions. Effects of bearing pressure and internal sliding area ratio have been investigated. Restoring force model of CRB has been derived and fits well with test results. Numerical parametric studies proved the good isolation performance of CRB. The performance is enhanced with the enlargement of internal sliding areas.
Abstract For unbonded laminated natural rubber bearings (ULNBs) which are popular in highway bridges with medium-to-small spans especially in China, the linear and single deformation pattern consisting only of rubber shearing leads to a lack of displacement capacity and a great tendency to slide, resulting in severe damages in recent earthquakes. The excessive displacement of superstructures due to bearing sliding can be lowered and controlled by the introduction of external devices or the improvement on bearings themselves, but with disadvantages. Therefore, the objective of this study is to propose a new bearing, the composite rubber bearing (CRB), to enhance the displacement capacity before the total bearing sliding by combining the sections of the LNBs and the sliding rubber bearings (SRBs). Bearing tests including vertical compression tests, quasi-static tests with variable and constant amplitudes have been conducted on 7 full-scale specimens to investigate the mechanical properties of CRBs and the corresponding influencing factors. Then, the restoring force model has been derived based on the design concept. The influences of internal sliding areas and the PGAs on seismic responses of bridge structures have been studied through a numerical parametric study. Compared with LNBs, the test results show a larger vertical stiffness and energy dissipation capacity and a smaller equivalent horizontal stiffness of CRBs, which are related to the pressure, the position as well as the stiffness ratio of the sliding area. The numerical results illustrate an improved seismic performance by increasing internal sliding area to considerably delay the critical point of the bearing sliding.
Seismic performance of composite rubber bearings for highway bridges: Bearing test and numerical parametric study
https://orcid.org/0000-0001-9100-6624
Highlights Composite rubber bearing (CRB) is proposed to improve bearing displacement capacity. Bearing tests have been conducted in both vertical and horizontal directions. Effects of bearing pressure and internal sliding area ratio have been investigated. Restoring force model of CRB has been derived and fits well with test results. Numerical parametric studies proved the good isolation performance of CRB. The performance is enhanced with the enlargement of internal sliding areas.
Abstract For unbonded laminated natural rubber bearings (ULNBs) which are popular in highway bridges with medium-to-small spans especially in China, the linear and single deformation pattern consisting only of rubber shearing leads to a lack of displacement capacity and a great tendency to slide, resulting in severe damages in recent earthquakes. The excessive displacement of superstructures due to bearing sliding can be lowered and controlled by the introduction of external devices or the improvement on bearings themselves, but with disadvantages. Therefore, the objective of this study is to propose a new bearing, the composite rubber bearing (CRB), to enhance the displacement capacity before the total bearing sliding by combining the sections of the LNBs and the sliding rubber bearings (SRBs). Bearing tests including vertical compression tests, quasi-static tests with variable and constant amplitudes have been conducted on 7 full-scale specimens to investigate the mechanical properties of CRBs and the corresponding influencing factors. Then, the restoring force model has been derived based on the design concept. The influences of internal sliding areas and the PGAs on seismic responses of bridge structures have been studied through a numerical parametric study. Compared with LNBs, the test results show a larger vertical stiffness and energy dissipation capacity and a smaller equivalent horizontal stiffness of CRBs, which are related to the pressure, the position as well as the stiffness ratio of the sliding area. The numerical results illustrate an improved seismic performance by increasing internal sliding area to considerably delay the critical point of the bearing sliding.
Seismic performance of composite rubber bearings for highway bridges: Bearing test and numerical parametric study
https://orcid.org/0000-0001-9100-6624
Highlights Composite rubber bearing (CRB) is proposed to improve bearing displacement capacity. Bearing tests have been conducted in both vertical and horizontal directions. Effects of bearing pressure and internal sliding area ratio have been investigated. Restoring force model of CRB has been derived and fits well with test results. Numerical parametric studies proved the good isolation performance of CRB. The performance is enhanced with the enlargement of internal sliding areas.
Abstract For unbonded laminated natural rubber bearings (ULNBs) which are popular in highway bridges with medium-to-small spans especially in China, the linear and single deformation pattern consisting only of rubber shearing leads to a lack of displacement capacity and a great tendency to slide, resulting in severe damages in recent earthquakes. The excessive displacement of superstructures due to bearing sliding can be lowered and controlled by the introduction of external devices or the improvement on bearings themselves, but with disadvantages. Therefore, the objective of this study is to propose a new bearing, the composite rubber bearing (CRB), to enhance the displacement capacity before the total bearing sliding by combining the sections of the LNBs and the sliding rubber bearings (SRBs). Bearing tests including vertical compression tests, quasi-static tests with variable and constant amplitudes have been conducted on 7 full-scale specimens to investigate the mechanical properties of CRBs and the corresponding influencing factors. Then, the restoring force model has been derived based on the design concept. The influences of internal sliding areas and the PGAs on seismic responses of bridge structures have been studied through a numerical parametric study. Compared with LNBs, the test results show a larger vertical stiffness and energy dissipation capacity and a smaller equivalent horizontal stiffness of CRBs, which are related to the pressure, the position as well as the stiffness ratio of the sliding area. The numerical results illustrate an improved seismic performance by increasing internal sliding area to considerably delay the critical point of the bearing sliding.
Seismic performance of composite rubber bearings for highway bridges: Bearing test and numerical parametric study
Zhong, Haiqiang (author) / Yuan, Wancheng (author) / Dang, Xinzhi (author) / Deng, Xiaowei (author)
Engineering Structures ; 253
2021-11-27
Article (Journal)
Electronic Resource
English
A parametric study of seismic behavior of roller seismic isolation bearings for highway bridges
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