### Abstract

A half scale physical model (Model Dome) of one of the timbrel domes located in the Nebraska State Capitol is constructed at the Peter Kiewit Institute-Structures Laboratory of the University of Nebraska. The Model Dome represents the unique construction style of concentric timbrel domes. The final dome is to comprise of three-layers of thin clay tiles, however, currently it is formed of a single layer of tiles, as the project is in progress. Using experimental modal analysis techniques, the possibilities of extracting system characteristics are investigated. The system characteristics of interest are natural frequency, mode shapes and component stiffness values. Moreover, several experiments are conducted to study the relationships between these parameters, such as testing the dome with an external mass, i.e. varying the mass, while keeping the stiffness constant. The dome is also tested several times during the year and changes in the material characteristics due to environmental effects are taken into consideration. Three-dimensional finite element models are created for the Model Dome to aid in the material characteristic identification. The comparison of experimental and analytical results also leads to a more accurate simulation of the structural behavior of the actual system and allows for useful recommendations for the finite element modeling of these structures.

Original language | English (US) |
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Title of host publication | Proceedings of the 2nd International Operational Modal Analysis Conference, IOMAC 2007 |

Publisher | Aalborg University |

ISBN (Print) | 9788791606144 |

State | Published - Jan 1 2007 |

Event | 2nd International Operational Modal Analysis Conference, IOMAC 2007 - Copenhagen, Denmark Duration: Apr 30 2007 → May 2 2007 |

### Publication series

Name | Proceedings of the 2nd International Operational Modal Analysis Conference, IOMAC 2007 |
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### Other

Other | 2nd International Operational Modal Analysis Conference, IOMAC 2007 |
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Country | Denmark |

City | Copenhagen |

Period | 4/30/07 → 5/2/07 |

### Fingerprint

### ASJC Scopus subject areas

- Signal Processing
- Civil and Structural Engineering
- Mechanical Engineering
- Safety, Risk, Reliability and Quality

### Cite this

*Proceedings of the 2nd International Operational Modal Analysis Conference, IOMAC 2007*(Proceedings of the 2nd International Operational Modal Analysis Conference, IOMAC 2007). Aalborg University.

**System characteristic identification of timbrel domes using modal analysis.** / Erdogmus, Ece; Skourup, Brian.

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

*Proceedings of the 2nd International Operational Modal Analysis Conference, IOMAC 2007.*Proceedings of the 2nd International Operational Modal Analysis Conference, IOMAC 2007, Aalborg University, 2nd International Operational Modal Analysis Conference, IOMAC 2007, Copenhagen, Denmark, 4/30/07.

}

TY - GEN

T1 - System characteristic identification of timbrel domes using modal analysis

AU - Erdogmus, Ece

AU - Skourup, Brian

PY - 2007/1/1

Y1 - 2007/1/1

N2 - A half scale physical model (Model Dome) of one of the timbrel domes located in the Nebraska State Capitol is constructed at the Peter Kiewit Institute-Structures Laboratory of the University of Nebraska. The Model Dome represents the unique construction style of concentric timbrel domes. The final dome is to comprise of three-layers of thin clay tiles, however, currently it is formed of a single layer of tiles, as the project is in progress. Using experimental modal analysis techniques, the possibilities of extracting system characteristics are investigated. The system characteristics of interest are natural frequency, mode shapes and component stiffness values. Moreover, several experiments are conducted to study the relationships between these parameters, such as testing the dome with an external mass, i.e. varying the mass, while keeping the stiffness constant. The dome is also tested several times during the year and changes in the material characteristics due to environmental effects are taken into consideration. Three-dimensional finite element models are created for the Model Dome to aid in the material characteristic identification. The comparison of experimental and analytical results also leads to a more accurate simulation of the structural behavior of the actual system and allows for useful recommendations for the finite element modeling of these structures.

AB - A half scale physical model (Model Dome) of one of the timbrel domes located in the Nebraska State Capitol is constructed at the Peter Kiewit Institute-Structures Laboratory of the University of Nebraska. The Model Dome represents the unique construction style of concentric timbrel domes. The final dome is to comprise of three-layers of thin clay tiles, however, currently it is formed of a single layer of tiles, as the project is in progress. Using experimental modal analysis techniques, the possibilities of extracting system characteristics are investigated. The system characteristics of interest are natural frequency, mode shapes and component stiffness values. Moreover, several experiments are conducted to study the relationships between these parameters, such as testing the dome with an external mass, i.e. varying the mass, while keeping the stiffness constant. The dome is also tested several times during the year and changes in the material characteristics due to environmental effects are taken into consideration. Three-dimensional finite element models are created for the Model Dome to aid in the material characteristic identification. The comparison of experimental and analytical results also leads to a more accurate simulation of the structural behavior of the actual system and allows for useful recommendations for the finite element modeling of these structures.

UR - http://www.scopus.com/inward/record.url?scp=84906095282&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84906095282&partnerID=8YFLogxK

M3 - Conference contribution

SN - 9788791606144

T3 - Proceedings of the 2nd International Operational Modal Analysis Conference, IOMAC 2007

BT - Proceedings of the 2nd International Operational Modal Analysis Conference, IOMAC 2007

PB - Aalborg University

ER -