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Yang P, Xue S, Xie L, Cao M. Damping Estimation of an Eight-Story Steel Building Equipped with Oil Dampers. Applied Sciences 2020; 10:8989. [DOI: 10.3390/app10248989] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
The damping estimation of an eight-story steel building equipped with oil dampers is examined, carried out by adopting a proposed framework, which consists of an enhanced strain-energy method and an improved direct method for model updating. The building is located at Tohoku Institute of Technology and is equipped with a structural monitoring system that measures its seismic response, including floor acceleration and displacement and force of oil dampers. The enhanced strain-energy method is first developed and employed to assess the supplemental damping and stiffness provided by oil dampers, herein quantified in the form of equivalent damping ratios and natural frequencies. Then, modal characteristics extracted from the earthquake measurements are modified accordingly and utilized for the building model updating, in which mass and stiffness matrices are corrected by the improved direct method. The updated model accurately reproduces the target modal data, especially measured mode participation factors, and is further used for the building response predictions. Through prediction validations, the precision of the modified modal parameters is verified. Finally, a large earthquake event is chosen to demonstrate the effectiveness of the proposed framework for the damping estimation of the investigated building.
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Raby A, Antonini A, D'Ayala D, Brownjohn JMW. Environmental loading of heritage structures. Philos Trans A Math Phys Eng Sci 2019; 377:20190276. [PMID: 31424341 PMCID: PMC6710470 DOI: 10.1098/rsta.2019.0276] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Accepted: 06/28/2019] [Indexed: 06/10/2023]
Affiliation(s)
- Alison Raby
- School of Engineering, University of Plymouth, Drake Circus, Plymouth PL4 8AA, UK
| | - Alessandro Antonini
- Department of Hydraulics Engineering, Delft University of Technology, 2628 CN Delft, Netherlands
| | - Dina D'Ayala
- Civil, Environmental and Geomatic Engineering, UCL, Gower Street, London WC1E 6BT, UK
| | - James M. W. Brownjohn
- College of Engineering, Mathematics and Physical Sciences, University of Exeter, Exeter, EX4 4QF, UK
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