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Experimental Investigation of Elastomeric Isolation Bearings with Flexible Supporting Columns
| 题名： | Experimental Investigation of Elastomeric Isolation Bearings with Flexible Supporting Columns |
| 正文语种： | 英文 |
| 作者： | Adrian P. Crowder;Tracy C. Becker, A.M.ASCE |
| 作者单位： | McMaster Univ |
| 关键词： | Seismic isolation; Elastomeric; Rotation; Flexible; Substructure; Retrofit; Structural control. |
| 摘要： | In an effort to mitigate major costs associated with isolation systems, especially in retrofit applications, isolation bearings may be placed on the tops of columns. In this configuration, a seismic gap and additional rigid diaphragm are no longer necessary, and excavation and foundation work may potentially be avoided in retrofit applications; however, columns under the isolation layer may not provide rigid boundary conditions, resulting in bearing end plates not remaining parallel. To investigate the effects of flexible columns in a column-top isolation system with elastomeric bearings, quasi-static cyclic testing of bearing-column subassemblies were conducted. Findings show that flexible end conditions can significantly reduce the lateral stiffness of elastomeric bearings. A simple analytical stiffness matrix is derived for bearings consisting of translational and rotational degrees of freedom at both end plates and is compared against < experimental results. The simple model compares well for initial behavior but diverges from experimental results with larger end-plate rotations; however, when calibrated nonlinear material properties are included, the model performs well at capturing the behavior of elastomeric bearings when subjected to partially restrained boundary conditions. DOI: 10.106l/(ASCE)ST.1943-541X.0001784. © 2017 American Society of Civil Engineers. |
| 出版日期： | 2017.07 |
| 出版年： | 2017 |
| 期刊名称： | Journal of Structural Engineering |
| 卷： | Vol.143 |
| 期： | NO.07 |
| 页码： | 04017057 |
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