Spectral Assessment of the Effects of Base Flexibility on Seismic Demands of a Structure
Base flexibility of structures changes and can increase the demands on structural elements during earthquake excitation. Such flexibility may come from the base connection, foundation, and soil under the foundation. This research evaluates the effects of column base rotational stiffness on the seism...
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| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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Wiley
2016-01-01
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| Series: | Advances in Civil Engineering |
| Online Access: | http://dx.doi.org/10.1155/2016/3984149 |
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| author | J. Borzouie J. G. Chase G. A. MacRae G. W. Rodgers G. C. Clifton |
| author_facet | J. Borzouie J. G. Chase G. A. MacRae G. W. Rodgers G. C. Clifton |
| author_sort | J. Borzouie |
| collection | DOAJ |
| description | Base flexibility of structures changes and can increase the demands on structural elements during earthquake excitation. Such flexibility may come from the base connection, foundation, and soil under the foundation. This research evaluates the effects of column base rotational stiffness on the seismic demand of single storey frames with a range of periods using linear and nonlinear time history analysis. The base rotational stiffness ranges considered are based on previous studies considering foundation and baseplate flexibility. Linear and nonlinear spectral analyses show that increasing base flexibility generally increases frame lateral displacement and top moment of the column. Furthermore, moments at the top of the columns and the nonlinear base rotation may also increase with increasing base flexibility, especially for shorter period structures. Since many commonly used baseplate connections may be categorized as being semirigid, it is essential to design and model structures using realistic base rotational stiffness rather than simply use a fixed base assumption. The overall results also illustrate the range of increased seismic demand as a function of normalized rotational stiffness and structural period for consideration in design. |
| format | Article |
| id | doaj-art-cf8d3c5b12804259a3be60092bf091cf |
| institution | Kabale University |
| issn | 1687-8086 1687-8094 |
| language | English |
| publishDate | 2016-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Advances in Civil Engineering |
| spelling | doaj-art-cf8d3c5b12804259a3be60092bf091cf2025-02-03T00:59:12ZengWileyAdvances in Civil Engineering1687-80861687-80942016-01-01201610.1155/2016/39841493984149Spectral Assessment of the Effects of Base Flexibility on Seismic Demands of a StructureJ. Borzouie0J. G. Chase1G. A. MacRae2G. W. Rodgers3G. C. Clifton4University of Canterbury, Private Bag 4800, Christchurch 8140, New ZealandUniversity of Canterbury, Private Bag 4800, Christchurch 8140, New ZealandUniversity of Canterbury, Private Bag 4800, Christchurch 8140, New ZealandUniversity of Canterbury, Private Bag 4800, Christchurch 8140, New ZealandUniversity of Auckland, Private Bag 92019, Auckland 1142, New ZealandBase flexibility of structures changes and can increase the demands on structural elements during earthquake excitation. Such flexibility may come from the base connection, foundation, and soil under the foundation. This research evaluates the effects of column base rotational stiffness on the seismic demand of single storey frames with a range of periods using linear and nonlinear time history analysis. The base rotational stiffness ranges considered are based on previous studies considering foundation and baseplate flexibility. Linear and nonlinear spectral analyses show that increasing base flexibility generally increases frame lateral displacement and top moment of the column. Furthermore, moments at the top of the columns and the nonlinear base rotation may also increase with increasing base flexibility, especially for shorter period structures. Since many commonly used baseplate connections may be categorized as being semirigid, it is essential to design and model structures using realistic base rotational stiffness rather than simply use a fixed base assumption. The overall results also illustrate the range of increased seismic demand as a function of normalized rotational stiffness and structural period for consideration in design.http://dx.doi.org/10.1155/2016/3984149 |
| spellingShingle | J. Borzouie J. G. Chase G. A. MacRae G. W. Rodgers G. C. Clifton Spectral Assessment of the Effects of Base Flexibility on Seismic Demands of a Structure Advances in Civil Engineering |
| title | Spectral Assessment of the Effects of Base Flexibility on Seismic Demands of a Structure |
| title_full | Spectral Assessment of the Effects of Base Flexibility on Seismic Demands of a Structure |
| title_fullStr | Spectral Assessment of the Effects of Base Flexibility on Seismic Demands of a Structure |
| title_full_unstemmed | Spectral Assessment of the Effects of Base Flexibility on Seismic Demands of a Structure |
| title_short | Spectral Assessment of the Effects of Base Flexibility on Seismic Demands of a Structure |
| title_sort | spectral assessment of the effects of base flexibility on seismic demands of a structure |
| url | http://dx.doi.org/10.1155/2016/3984149 |
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