TY - JOUR
T1 - Digital twin-based collapse fragility assessment of a long-span cable-stayed bridge under strong earthquakes
AU - Lin, Kaiqi
AU - Xu, You Lin
AU - Lu, Xinzheng
AU - Guan, Zhongguo
AU - Li, Jianzhong
N1 - Funding Information:
The authors wish to acknowledge the financial support from the Research Grants Council of Hong Kong through a competitive GRF grant (Grant No. 15269516 ). The financial support from The Hong Kong Polytechnic University through a special grant (Grant No. 1-ZVN3 ) and the National Natural Science Foundation of China (No. 51908133 ) is also appreciated. The authors are grateful for the Information Technology Services of the Hong Kong Polytechnic University for providing the servers. The authors would also like to acknowledge Prof. Hong Hao from Curtin University, Australia, for his help in securing the first research grant for this work. Any opinions and conclusions presented in this paper are entirely those of the authors.
Publisher Copyright:
© 2021 Elsevier B.V.
PY - 2021/3
Y1 - 2021/3
N2 - Fragility analysis is widely used in seismic performance assessment of bridges but uncertainties in seismic demand and bridge modelling affect the accuracy of assessment results. This study proposes a digital twin-based collapse fragility assessment method for long-span cable-stayed bridges under strong earthquakes. A scaled long-span cable-stayed bridge and its shake table tests are taken as an example. Three finite element (FE) models of the bridge, including a design document-based FE model, a linearly updated FE model, and a nonlinearly updated FE model, are established to demonstrate the necessity of the digital twin-based assessment. Incremental dynamic analyses (IDA) are conducted to calculate the collapse fragility curves of the FE models. The assessment results are compared with the test results in terms of collapse mechanisms, collapse ground motion intensities, and collapse probabilities. It is found that the proposed method is feasible and accurate for seismic collapse assessment of long-span cable-stayed bridges.
AB - Fragility analysis is widely used in seismic performance assessment of bridges but uncertainties in seismic demand and bridge modelling affect the accuracy of assessment results. This study proposes a digital twin-based collapse fragility assessment method for long-span cable-stayed bridges under strong earthquakes. A scaled long-span cable-stayed bridge and its shake table tests are taken as an example. Three finite element (FE) models of the bridge, including a design document-based FE model, a linearly updated FE model, and a nonlinearly updated FE model, are established to demonstrate the necessity of the digital twin-based assessment. Incremental dynamic analyses (IDA) are conducted to calculate the collapse fragility curves of the FE models. The assessment results are compared with the test results in terms of collapse mechanisms, collapse ground motion intensities, and collapse probabilities. It is found that the proposed method is feasible and accurate for seismic collapse assessment of long-span cable-stayed bridges.
KW - Digital twin
KW - Fragility analysis
KW - Long-span cable-stayed bridge
KW - Modelling uncertainties
KW - Seismic collapse assessment
KW - Shake table tests
UR - http://www.scopus.com/inward/record.url?scp=85099354526&partnerID=8YFLogxK
U2 - 10.1016/j.autcon.2020.103547
DO - 10.1016/j.autcon.2020.103547
M3 - Journal article
AN - SCOPUS:85099354526
SN - 0926-5805
VL - 123
JO - Automation in Construction
JF - Automation in Construction
M1 - 103547
ER -