Seismic design of friction damped braced steel plane frames by energy methods
The investigation described in this thesis represents the first known attempt to develop a simplified method for the seismic design of structures equipped with a novel friction damping system. The system has been shown experimentally to perform very well and is an exciting development in earthquake...
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ndltd-UBC-oai-circle.library.ubc.ca-2429-287762018-01-05T17:44:48Z Seismic design of friction damped braced steel plane frames by energy methods Filiatrault, Andre Buildings -- Earthquake effects Earthquake resistant design The investigation described in this thesis represents the first known attempt to develop a simplified method for the seismic design of structures equipped with a novel friction damping system. The system has been shown experimentally to perform very well and is an exciting development in earthquake resistant design. The design of a building equipped with the friction damping system is achieved by determining the optimum slip load distribution to minimize structural response. A new efficient numerical modelling approach for the analysis and design of Friction Damped Braced Frames (FDBF) is presented. The hysteretic properties of the friction devices are derived theoretically and included in a Friction Damped Braced Frame Analysis Program (FDBFAP), which is adaptable to a microcomputer environment. The optimum slip load distribution is determined by minimizing a Relative Performance Index (RPI) derived from energy concepts. The steady-state response of a single storey friction damped structure subjected to sinusoidal ground motion is investigated analytically. Basic design information on the optimum slip load for the friction device is obtained. The parameters governing the optimum slip load, which minimizes the amplitude for any forcing frequency, are derived. The study indicates that the optimum slip load depends on the characteristics of the ground motion and of the structure. Using variational principles on a shear beam analogy, an optimum slip load distribution along the height of the structure is derived when the total amount of slip load is specified. It is shown that the optimum slip load is proportional to the slope of the deflected shape of the structure. The results of the study reveal that only a small improvement in the response is obtained by using this optimum distribution compared to the response obtained with a uniform distribution. Therefore the use of an optimum uniform distribution seems adequate for the design of friction damped structures. Taking into account the analytical results obtained, FDBFAP is then used in a parametric study which leads to the construction of a design slip load spectrum. The spectrum depends on the properties of the structure and ground motion anticipated at the construction site. It is believed that the availability of this design slip load spectrum will lead to a greater acceptance by the engineering profession of this new and innovative structural concept. Applied Science, Faculty of Civil Engineering, Department of Graduate 2010-09-28T19:46:19Z 2010-09-28T19:46:19Z 1988 Text Thesis/Dissertation http://hdl.handle.net/2429/28776 eng For non-commercial purposes only, such as research, private study and education. Additional conditions apply, see Terms of Use https://open.library.ubc.ca/terms_of_use. University of British Columbia |
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English |
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Buildings -- Earthquake effects Earthquake resistant design |
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Buildings -- Earthquake effects Earthquake resistant design Filiatrault, Andre Seismic design of friction damped braced steel plane frames by energy methods |
description |
The investigation described in this thesis represents the first known attempt to develop a simplified method for the seismic design of structures equipped with a novel friction damping system. The system has been shown experimentally to perform very well and is an exciting development in earthquake resistant design. The design of a building equipped with the friction damping system is achieved by determining the optimum slip load distribution to minimize structural response.
A new efficient numerical modelling approach for the analysis and design of Friction Damped Braced Frames (FDBF) is presented. The hysteretic properties of the friction devices are derived theoretically and included in a Friction Damped Braced Frame Analysis Program (FDBFAP), which is adaptable to a microcomputer environment. The optimum slip load distribution is determined by minimizing a Relative Performance Index (RPI) derived from energy concepts.
The steady-state response of a single storey friction damped structure subjected to sinusoidal ground motion is investigated analytically. Basic design information on the optimum slip load for the friction device is obtained. The parameters governing the optimum slip load, which minimizes the amplitude for any forcing frequency, are derived. The study indicates that the optimum slip load depends on the characteristics of the ground motion and of the structure.
Using variational principles on a shear beam analogy, an optimum slip load distribution along the height of the structure is derived when the total amount of slip load is specified. It is shown that the optimum slip load is proportional to the slope of the deflected shape of the structure. The results of the study reveal that only a small improvement in the response is obtained by using this optimum distribution
compared to the response obtained with a uniform distribution. Therefore the use of an optimum uniform distribution seems adequate for the design of friction damped structures.
Taking into account the analytical results obtained, FDBFAP is then used in a parametric study which leads to the construction of a design slip load spectrum. The spectrum depends on the properties of the structure and ground motion anticipated at the construction site. It is believed that the availability of this design slip load spectrum will lead to a greater acceptance by the engineering profession of this new and innovative structural concept. === Applied Science, Faculty of === Civil Engineering, Department of === Graduate |
author |
Filiatrault, Andre |
author_facet |
Filiatrault, Andre |
author_sort |
Filiatrault, Andre |
title |
Seismic design of friction damped braced steel plane frames by energy methods |
title_short |
Seismic design of friction damped braced steel plane frames by energy methods |
title_full |
Seismic design of friction damped braced steel plane frames by energy methods |
title_fullStr |
Seismic design of friction damped braced steel plane frames by energy methods |
title_full_unstemmed |
Seismic design of friction damped braced steel plane frames by energy methods |
title_sort |
seismic design of friction damped braced steel plane frames by energy methods |
publisher |
University of British Columbia |
publishDate |
2010 |
url |
http://hdl.handle.net/2429/28776 |
work_keys_str_mv |
AT filiatraultandre seismicdesignoffrictiondampedbracedsteelplaneframesbyenergymethods |
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1718593729169719296 |