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Sensitivity of Seismic Response and Fragility to Parameter Uncertainty of Single-Layer Reticulated Domes

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Abstract

Quantitatively modeling and propagating all sources of uncertainty stand at the core of seismic fragility assessment of structures. This paper investigates the effects of various sources of uncertainty on seismic responses and seismic fragility estimates of single-layer reticulated domes. Sensitivity analyses are performed to examine the sensitivity of typical seismic responses to uncertainties in structural modeling parameters, and the results suggest that the variability in structural damping, yielding strength, steel ultimate strain, dead load and snow load has significant effects on the seismic responses, and these five parameters should be taken as random variables in the seismic fragility assessment. Based on this, fragility estimates and fragility curves incorporating different levels of uncertainty are obtained on the basis of the results of incremental dynamic analyses on the corresponding set of 40 sample models generated by Latin Hypercube Sampling method. The comparisons of these fragility curves illustrate that, the inclusion of only ground motion uncertainty is inappropriate and inadequate, and the appropriate way is incorporating the variability in the five identified structural modeling parameters as well into the seismic fragility assessment of single-layer reticulated domes.

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Acknowledgements

This present work has been conducted with the financial support from the Fundamental Research Funds for the Central Universities (Grant No. 3102017OQD071), and the National Natural Science Foundation of China (Grant Nos. 51525802 and 51778157). The very constructive comments by the reviewers to this paper are also greatly appreciated.

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Authors and Affiliations

  1. School of Mechanics, Civil Engineering and Architecture, Northwestern Polytechnical University, Xi’an, 710072, People’s Republic of China

    Jie Zhong

  2. Key Laboratory of Structures Dynamic Behavior and Control of the Ministry of Education, Harbin Institute of Technology, Harbin, 150090, People’s Republic of China

    Xudong Zhi & Feng Fan

  3. School of Civil Engineering, Harbin Institute of Technology, Harbin, 150090, People’s Republic of China

    Xudong Zhi & Feng Fan

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  1. Jie Zhong
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  2. Xudong Zhi
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Correspondence to Jie Zhong.

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Zhong, J., Zhi, X. & Fan, F. Sensitivity of Seismic Response and Fragility to Parameter Uncertainty of Single-Layer Reticulated Domes. Int J Steel Struct 18, 1607–1616 (2018). https://doi.org/10.1007/s13296-018-0057-3

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  • DOI: https://doi.org/10.1007/s13296-018-0057-3

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