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Earthquakes and Structures Volume 11, Number 2, August 2016 , pages 245-264 DOI: https://doi.org/10.12989/eas.2016.11.2.245 |
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A dominant vibration mode-based scalar ground motion intensity measure for single-layer reticulated domes |
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Jie Zhong, Xudong Zhi and Feng Fan
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| Abstract | ||
| A suitable ground motion intensity measure (IM) plays a crucial role in the seismic performance assessment of a structure. In this paper, we introduce a scalar IM for use in evaluating the seismic response of single-layer reticulated domes. This IM is defined as the weighted geometric mean of the spectral acceleration ordinates at the periods of the dominant vibration modes of the structure considered, and the modal strain energy ratio of each dominant vibration mode is the corresponding weight. Its applicability and superiority to 11 other existing IMs are firstly investigated in terms of correlation with the nonlinear seismic response, efficiency and sufficiency using the results of incremental dynamic analyses which are performed for a typical single-layer reticulated dome. The hazard computability of this newly proposed IM is also briefly discussed and illustrated. A conclusion is drawn that this dominant vibration mode-based scalar IM has the characteristics of strong correlation, high efficiency, good sufficiency as well as hazard computability, and thereby is appropriate for use in the prediction of seismic response of single-layer reticulated domes. | ||
| Key Words | ||
| ground motion intensity measure; nonlinear seismic response; single-layer reticulated domes; incremental dynamic analysis; modal strain energy ratio | ||
| Address | ||
| Jie Zhong, Xudong Zhi and Feng Fan: Key Laboratory of Structures Dynamic Behavior and Control of the Ministry of Education, Harbin Institute of Technology, Harbin 150090, China Jie Zhong, Xudong Zhi and Feng Fan: School of Civil Engineering, Harbin Institute of Technology, Harbin 150090, China | ||