Influence of Elastomeric Bearings in Tension on the Seismic Performance of Base-Isolated r.c. Buildings
Elastomeric bearings are commonly used in base-isolation systems to protect the structures from earthquake damages. Their design is usually developed by using nonlinear models where only the effects of shear and compressive loads are considered, but uncertainties still remain about consequences of t...
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MDPI AG
2020-12-01
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| Series: | Applied Sciences |
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| Online Access: | https://www.mdpi.com/2076-3417/11/1/82 |
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| author | Fabio Mazza Mirko Mazza |
| author_facet | Fabio Mazza Mirko Mazza |
| author_sort | Fabio Mazza |
| collection | DOAJ |
| description | Elastomeric bearings are commonly used in base-isolation systems to protect the structures from earthquake damages. Their design is usually developed by using nonlinear models where only the effects of shear and compressive loads are considered, but uncertainties still remain about consequences of the tensile loads produced by severe earthquakes like the near-fault ones. The present work aims to highlight the relapses of tension on the response of bearings and superstructure. To this end, three-, seven- and ten-storey r.c. framed buildings are designed in line with the current Italian seismic code, with a base-isolation system constituted of High-Damping-Rubber Bearings (HDRBs) designed for three values of the ratio between the vertical and horizontal stiffnesses. Experimental and analytical results available in literature are used to propose a unified nonlinear model of the HDRBs, including cavitation and post-cavitation of the elastomer. Nonlinear incremental dynamic analyses of the test structures are carried out using a homemade computer code, where other models of HDRBs considering only some nonlinear phenomena are implemented. Near-fault earthquakes with comparable horizontal and vertical components, prevailing horizontal component and prevailing vertical component are considered as seismic input. Numerical results highlight that a precautionary estimation of response parameters of the HDRBs is attained referring to the proposed model, while its effects on the nonlinear response of the superstructure are less conservative. |
| first_indexed | 2024-03-10T13:48:20Z |
| format | Article |
| id | doaj.art-4f5fb1a9870f4779a795a277492fca73 |
| institution | Directory Open Access Journal |
| issn | 2076-3417 |
| language | English |
| last_indexed | 2024-03-10T13:48:20Z |
| publishDate | 2020-12-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Applied Sciences |
| spelling | doaj.art-4f5fb1a9870f4779a795a277492fca732023-11-21T02:22:12ZengMDPI AGApplied Sciences2076-34172020-12-011118210.3390/app11010082Influence of Elastomeric Bearings in Tension on the Seismic Performance of Base-Isolated r.c. BuildingsFabio Mazza0Mirko Mazza1Department of Civil Engineering, University of Calabria, 87036 Rende, ItalyDepartment of Civil Engineering, University of Calabria, 87036 Rende, ItalyElastomeric bearings are commonly used in base-isolation systems to protect the structures from earthquake damages. Their design is usually developed by using nonlinear models where only the effects of shear and compressive loads are considered, but uncertainties still remain about consequences of the tensile loads produced by severe earthquakes like the near-fault ones. The present work aims to highlight the relapses of tension on the response of bearings and superstructure. To this end, three-, seven- and ten-storey r.c. framed buildings are designed in line with the current Italian seismic code, with a base-isolation system constituted of High-Damping-Rubber Bearings (HDRBs) designed for three values of the ratio between the vertical and horizontal stiffnesses. Experimental and analytical results available in literature are used to propose a unified nonlinear model of the HDRBs, including cavitation and post-cavitation of the elastomer. Nonlinear incremental dynamic analyses of the test structures are carried out using a homemade computer code, where other models of HDRBs considering only some nonlinear phenomena are implemented. Near-fault earthquakes with comparable horizontal and vertical components, prevailing horizontal component and prevailing vertical component are considered as seismic input. Numerical results highlight that a precautionary estimation of response parameters of the HDRBs is attained referring to the proposed model, while its effects on the nonlinear response of the superstructure are less conservative.https://www.mdpi.com/2076-3417/11/1/82base-isolationhigh damping rubber bearingsnear-fault earthquakesnonlinear dynamic analysistensionbuckling |
| spellingShingle | Fabio Mazza Mirko Mazza Influence of Elastomeric Bearings in Tension on the Seismic Performance of Base-Isolated r.c. Buildings Applied Sciences base-isolation high damping rubber bearings near-fault earthquakes nonlinear dynamic analysis tension buckling |
| title | Influence of Elastomeric Bearings in Tension on the Seismic Performance of Base-Isolated r.c. Buildings |
| title_full | Influence of Elastomeric Bearings in Tension on the Seismic Performance of Base-Isolated r.c. Buildings |
| title_fullStr | Influence of Elastomeric Bearings in Tension on the Seismic Performance of Base-Isolated r.c. Buildings |
| title_full_unstemmed | Influence of Elastomeric Bearings in Tension on the Seismic Performance of Base-Isolated r.c. Buildings |
| title_short | Influence of Elastomeric Bearings in Tension on the Seismic Performance of Base-Isolated r.c. Buildings |
| title_sort | influence of elastomeric bearings in tension on the seismic performance of base isolated r c buildings |
| topic | base-isolation high damping rubber bearings near-fault earthquakes nonlinear dynamic analysis tension buckling |
| url | https://www.mdpi.com/2076-3417/11/1/82 |
| work_keys_str_mv | AT fabiomazza influenceofelastomericbearingsintensionontheseismicperformanceofbaseisolatedrcbuildings AT mirkomazza influenceofelastomericbearingsintensionontheseismicperformanceofbaseisolatedrcbuildings |