Inelastic Analysis of Frames with Tuned Mass Damper
Wael Adel Gairgis Oza;
Abstract
The advantages of adding a tuned mass damper at the roof of structures to reduce seismic acceleration response is discussed in the following chapters. Different structure frames were analytically studied using a suite of nonlinear static push over analysis and uniform building code UBC 97 regulations regarding response spectrum functions.
The analyses indicate that adding tuned mass dampershas a notable effect on the structure fundamental period as it increases causing decreasing of the seismic acceleration response of the structure when applying time history or response spectra records and comparing the structure behavior with and without using tuned mass dampers.
Appropriate design of the rooftop tuned mass dampercan be performed to decrease the structure vibration during earthquakes and reducing the developed internal forces in the structure which can leads to more economic design and can be used as a retrofit measure.
flexible structures having long fundamental periods seismic behavior is considered to be a good behavior as a lower level of internal forces is developed during seismic vibration than stiff structures with short fundamental periods. Base isolation was developed to be used for rigid structures to make it act as a limber structure while keeping the advantage of rigid structures. base isolation increases the fundamental period of a structure causing less respond to lateral seismic acceleration. Any other method that can cause the fundamental period of a structure to be increased can have a similar effect ofseismic base isolation.
Passive energy absorbing devices have many types,tuned mass damper (TMD) is one of the familiar types which has been used in many structures.
In this study different steel framing systems are investigated with regards to their lateralload carrying capacity and in this context seismic response modification factors of individual systems are analyzed. Numerous load resisting layouts, such as different bracing systems and un-braced moment resisting frames with various story configurations are designed and evaluated in a parametric fashion. Twotypes of beam to column connection conditions are incorporated in evaluationprocess.
The seismic behavior factor (R) is evaluated for steel frames portal and X-braced. The R factor is composed of three main items including ductility reduction factor and overstrength factor which are calculated based on the inelastic pushover analyses results of each framing system regarding frame geometry (spans and heights) and the used connection type.
Frames, designed according to UBC97 seismic code, are investigated by nonlinear static analysis with the guidance of previous studies and recent provisions of FEMA. Method of analysis, design and evaluation data are presented in details.
Previous studies in literature, history and the theory of response modification phenomenon is presented. Results are summarized, main weaknesses and ambiguities introduced to design by the use of “R” factors are stated depending on the observed behavior.
Keywords: Nonlinear analysis, steel frames, pushover analysis, tuned mass dampers
The analyses indicate that adding tuned mass dampershas a notable effect on the structure fundamental period as it increases causing decreasing of the seismic acceleration response of the structure when applying time history or response spectra records and comparing the structure behavior with and without using tuned mass dampers.
Appropriate design of the rooftop tuned mass dampercan be performed to decrease the structure vibration during earthquakes and reducing the developed internal forces in the structure which can leads to more economic design and can be used as a retrofit measure.
flexible structures having long fundamental periods seismic behavior is considered to be a good behavior as a lower level of internal forces is developed during seismic vibration than stiff structures with short fundamental periods. Base isolation was developed to be used for rigid structures to make it act as a limber structure while keeping the advantage of rigid structures. base isolation increases the fundamental period of a structure causing less respond to lateral seismic acceleration. Any other method that can cause the fundamental period of a structure to be increased can have a similar effect ofseismic base isolation.
Passive energy absorbing devices have many types,tuned mass damper (TMD) is one of the familiar types which has been used in many structures.
In this study different steel framing systems are investigated with regards to their lateralload carrying capacity and in this context seismic response modification factors of individual systems are analyzed. Numerous load resisting layouts, such as different bracing systems and un-braced moment resisting frames with various story configurations are designed and evaluated in a parametric fashion. Twotypes of beam to column connection conditions are incorporated in evaluationprocess.
The seismic behavior factor (R) is evaluated for steel frames portal and X-braced. The R factor is composed of three main items including ductility reduction factor and overstrength factor which are calculated based on the inelastic pushover analyses results of each framing system regarding frame geometry (spans and heights) and the used connection type.
Frames, designed according to UBC97 seismic code, are investigated by nonlinear static analysis with the guidance of previous studies and recent provisions of FEMA. Method of analysis, design and evaluation data are presented in details.
Previous studies in literature, history and the theory of response modification phenomenon is presented. Results are summarized, main weaknesses and ambiguities introduced to design by the use of “R” factors are stated depending on the observed behavior.
Keywords: Nonlinear analysis, steel frames, pushover analysis, tuned mass dampers
Other data
| Title | Inelastic Analysis of Frames with Tuned Mass Damper | Other Titles | التحليل اللاخطي للاطارات في وجود الكتل المخمدة | Authors | Wael Adel Gairgis Oza | Issue Date | 2016 |
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