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Vertical stiffness reduction of rubber bearings under lateral displacement considering different shape factors
https://orcid.org/0000-0002-4396-4390
https://orcid.org/0000-0002-0193-6076
https://orcid.org/0000-0003-0350-0142
Abstract Rubber bearings are composite components consisting of rubber layers and steel shims, which have been widely used in seismic isolation structures. The vertical stiffness of rubber bearings reduces significantly under lateral displacement. Previous studies have not clarified the vertical stiffness reduction for bearings with different dimensions. The focus of this study is to comprehensively explore the influence of the first and second shape factors (S 1 and S 2) on the vertical stiffness reduction of bearings with different shapes and to develop a prediction method. On the basis of the two-spring model, an improved theoretical formula for predicting the vertical stiffness of bearings under a lateral displacement was derived considering the influence of the S 1. Subsequently, a series of finite element (FE) models were developed. The parameters of rubber material were calibrated using experimental data. A parametric FE study was conducted to investigate the influence of different S 1 and S 2 on the vertical stiffness reduction of bearings under lateral displacements. The effectiveness of the proposed formula was evaluated by comparing the results with those obtained from the FE analyses. Finally, based on the improved formula, an empirical formula for vertical stiffness reduction that can consider the influence of both S 1 and S 2 was developed. The predicted results of the empirical formula showed good agreement with the experimental and numerical results.
Highlights A formula that incorporates the influence of the first shape factor (S 1) on vertical stiffness reduction was derived. Three types of rubber material tests were conducted to calibrate the parameters of the constitutive model. A parametric finite element analysis was conducted to explore the impact of both shape factors. An empirical formulation was introduced to predict the vertical stiffness reduction of bearings with various shape factors.
Vertical stiffness reduction of rubber bearings under lateral displacement considering different shape factors
https://orcid.org/0000-0002-4396-4390
https://orcid.org/0000-0002-0193-6076
https://orcid.org/0000-0003-0350-0142
Abstract Rubber bearings are composite components consisting of rubber layers and steel shims, which have been widely used in seismic isolation structures. The vertical stiffness of rubber bearings reduces significantly under lateral displacement. Previous studies have not clarified the vertical stiffness reduction for bearings with different dimensions. The focus of this study is to comprehensively explore the influence of the first and second shape factors (S 1 and S 2) on the vertical stiffness reduction of bearings with different shapes and to develop a prediction method. On the basis of the two-spring model, an improved theoretical formula for predicting the vertical stiffness of bearings under a lateral displacement was derived considering the influence of the S 1. Subsequently, a series of finite element (FE) models were developed. The parameters of rubber material were calibrated using experimental data. A parametric FE study was conducted to investigate the influence of different S 1 and S 2 on the vertical stiffness reduction of bearings under lateral displacements. The effectiveness of the proposed formula was evaluated by comparing the results with those obtained from the FE analyses. Finally, based on the improved formula, an empirical formula for vertical stiffness reduction that can consider the influence of both S 1 and S 2 was developed. The predicted results of the empirical formula showed good agreement with the experimental and numerical results.
Highlights A formula that incorporates the influence of the first shape factor (S 1) on vertical stiffness reduction was derived. Three types of rubber material tests were conducted to calibrate the parameters of the constitutive model. A parametric finite element analysis was conducted to explore the impact of both shape factors. An empirical formulation was introduced to predict the vertical stiffness reduction of bearings with various shape factors.
Vertical stiffness reduction of rubber bearings under lateral displacement considering different shape factors
https://orcid.org/0000-0002-4396-4390
https://orcid.org/0000-0002-0193-6076
https://orcid.org/0000-0003-0350-0142
Abstract Rubber bearings are composite components consisting of rubber layers and steel shims, which have been widely used in seismic isolation structures. The vertical stiffness of rubber bearings reduces significantly under lateral displacement. Previous studies have not clarified the vertical stiffness reduction for bearings with different dimensions. The focus of this study is to comprehensively explore the influence of the first and second shape factors (S 1 and S 2) on the vertical stiffness reduction of bearings with different shapes and to develop a prediction method. On the basis of the two-spring model, an improved theoretical formula for predicting the vertical stiffness of bearings under a lateral displacement was derived considering the influence of the S 1. Subsequently, a series of finite element (FE) models were developed. The parameters of rubber material were calibrated using experimental data. A parametric FE study was conducted to investigate the influence of different S 1 and S 2 on the vertical stiffness reduction of bearings under lateral displacements. The effectiveness of the proposed formula was evaluated by comparing the results with those obtained from the FE analyses. Finally, based on the improved formula, an empirical formula for vertical stiffness reduction that can consider the influence of both S 1 and S 2 was developed. The predicted results of the empirical formula showed good agreement with the experimental and numerical results.
Highlights A formula that incorporates the influence of the first shape factor (S 1) on vertical stiffness reduction was derived. Three types of rubber material tests were conducted to calibrate the parameters of the constitutive model. A parametric finite element analysis was conducted to explore the impact of both shape factors. An empirical formulation was introduced to predict the vertical stiffness reduction of bearings with various shape factors.
Vertical stiffness reduction of rubber bearings under lateral displacement considering different shape factors
Yang, Yijian (author) / Li, Tao (author) / Dai, Kaoshan (author) / Xu, Jun (author) / Ge, Qingzi (author) / Ikago, Kohju (author)
2024-04-05
Article (Journal)
Electronic Resource
English
Vertical stiffness degradation of laminated rubber bearings under lateral deformation
| British Library Online Contents | 2017
Vertical stiffness degradation of laminated rubber bearings under lateral deformation
| Online Contents | 2017