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Experimental, numerical, and theoretical studies on vertical stiffness reduction of lead thick rubber bearings
Highlights Full-scale lead thick rubber bearings were subjected to combined lateral offset and axial load. Based on material and isolator level tests, a finite element model was calibrated. A parametric study was performed to quantify the vertical stiffness reduction. A new formulation was developed to accurately predict the vertical stiffness reduction.
Abstract Lead thick rubber bearings (LTRBs) are capable of mitigating vertical subway-induced vibration and horizontal seismic force as well as adding supplementary damping. During earthquakes, LTRBs would be accompanied by lateral displacements, which would cause vertical stiffness reduction. However, much uncertainty still exists about quantifying this reduction of vertical stiffness. This research intends to investigate the influence factors of the vertical stiffness reduction of LTRBs and to develop a formulation for accurate prediction. Three full-scale LTRBs with different first and second shape factors (S 1 and S 2) were designed and subjected to combined lateral displacement and compressive load for determining their vertical stiffness. Based on material and isolator level tests, a finite element (FE) model of LTRBs was calibrated. Then, parametric FE analyses were performed to explore the effects of various parameters on the normalized vertical stiffness over a wide range of lateral offset. Experimental and numerical studies quantified the reduction of vertical stiffness for different values of vertical pressure, S 1, and S 2. Besides, the test and simulated results were compared to the results from existing formulations and the inaccuracy of these formulations was indicated. Finally, a new formulation was developed and it showed good agreement with experimentally and numerically determined vertical stiffness of LTRBs.
Experimental, numerical, and theoretical studies on vertical stiffness reduction of lead thick rubber bearings
Highlights Full-scale lead thick rubber bearings were subjected to combined lateral offset and axial load. Based on material and isolator level tests, a finite element model was calibrated. A parametric study was performed to quantify the vertical stiffness reduction. A new formulation was developed to accurately predict the vertical stiffness reduction.
Abstract Lead thick rubber bearings (LTRBs) are capable of mitigating vertical subway-induced vibration and horizontal seismic force as well as adding supplementary damping. During earthquakes, LTRBs would be accompanied by lateral displacements, which would cause vertical stiffness reduction. However, much uncertainty still exists about quantifying this reduction of vertical stiffness. This research intends to investigate the influence factors of the vertical stiffness reduction of LTRBs and to develop a formulation for accurate prediction. Three full-scale LTRBs with different first and second shape factors (S 1 and S 2) were designed and subjected to combined lateral displacement and compressive load for determining their vertical stiffness. Based on material and isolator level tests, a finite element (FE) model of LTRBs was calibrated. Then, parametric FE analyses were performed to explore the effects of various parameters on the normalized vertical stiffness over a wide range of lateral offset. Experimental and numerical studies quantified the reduction of vertical stiffness for different values of vertical pressure, S 1, and S 2. Besides, the test and simulated results were compared to the results from existing formulations and the inaccuracy of these formulations was indicated. Finally, a new formulation was developed and it showed good agreement with experimentally and numerically determined vertical stiffness of LTRBs.
Experimental, numerical, and theoretical studies on vertical stiffness reduction of lead thick rubber bearings
Zhang, Zengde (author) / Zhou, Ying (author) / Vassiliou, Michalis F. (author)
2023-04-12
Article (Journal)
Electronic Resource
English
Vertical Stiffness of Elastomeric and Lead-Rubber Seismic Isolation Bearings
| British Library Online Contents | 2007
Vertical Stiffness of Elastomeric and Lead-Rubber Seismic Isolation Bearings
| Online Contents | 2007