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Experimental and analytical investigations on horizontal behavior of full-scale thick rubber bearings
Abstract Thick rubber bearings (TRBs) have been proven to be effective in mitigating both horizontal earthquakes and railway-induced vertical vibration. Due to their low first shape factor, the horizontal properties of TRBs should be carefully examined during isolation design. This study presents experimental and analytical investigations on the horizontal behavior of TRBs with different first and second shape factors (S 1 and S 2). Eight full-scale thick natural rubber bearings (TNRBs) and lead thick rubber bearings (LTRBs) specimens were designed and tested under shear loading. The effects of geometric parameters and loading conditions were explored. The test results showed that decreasing S 1 slightly reduced the horizontal stiffness, whereas the reduction caused by the decrease of S 2 was more pronounced. As the applied vertical pressure increased, the horizontal stiffness of both TNRBs and LTRBs reduced, while the yield strength and damping ratio of LTRBs increased. Besides, equations were developed to predict the variations in shear properties of TNRBs and LTRBs under varying shear strains. Then, the test results were used to assess the accuracy of existing formulations for the shear properties of rubber bearings. Accurate equations were determined for the effective stiffness of TNRBs, as well as the yield strength and post-yield stiffness of LTRBs. Moreover, this study validated accurate hysteretic models to predict the cyclic shear behavior of TNRBs and LTRBs.
Highlights Full-scale thick rubber bearings were subjected to cyclic shear loading. Formulations were determined for the horizontal properties of bearings. Hysteretic models were developed to predict the cyclic shear behavior of bearings.
Experimental and analytical investigations on horizontal behavior of full-scale thick rubber bearings
Abstract Thick rubber bearings (TRBs) have been proven to be effective in mitigating both horizontal earthquakes and railway-induced vertical vibration. Due to their low first shape factor, the horizontal properties of TRBs should be carefully examined during isolation design. This study presents experimental and analytical investigations on the horizontal behavior of TRBs with different first and second shape factors (S 1 and S 2). Eight full-scale thick natural rubber bearings (TNRBs) and lead thick rubber bearings (LTRBs) specimens were designed and tested under shear loading. The effects of geometric parameters and loading conditions were explored. The test results showed that decreasing S 1 slightly reduced the horizontal stiffness, whereas the reduction caused by the decrease of S 2 was more pronounced. As the applied vertical pressure increased, the horizontal stiffness of both TNRBs and LTRBs reduced, while the yield strength and damping ratio of LTRBs increased. Besides, equations were developed to predict the variations in shear properties of TNRBs and LTRBs under varying shear strains. Then, the test results were used to assess the accuracy of existing formulations for the shear properties of rubber bearings. Accurate equations were determined for the effective stiffness of TNRBs, as well as the yield strength and post-yield stiffness of LTRBs. Moreover, this study validated accurate hysteretic models to predict the cyclic shear behavior of TNRBs and LTRBs.
Highlights Full-scale thick rubber bearings were subjected to cyclic shear loading. Formulations were determined for the horizontal properties of bearings. Hysteretic models were developed to predict the cyclic shear behavior of bearings.
Experimental and analytical investigations on horizontal behavior of full-scale thick rubber bearings
Zhang, Zengde (author) / Zhou, Ying (author)
2023-08-14
Article (Journal)
Electronic Resource
English
Experimental Investigations on Laminated Rubber Bearings
| British Library Online Contents | 2005