Journal
ENGINEERING STRUCTURES
Volume 252, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.engstruct.2021.113728
Keywords
High-speed railway girder bridge (HRGB); Intensity measure (IM); Spectral acceleration; Modal analysis; Probabilistic seismic demand analysis (PSDA); Attenuation relationship
Categories
Funding
- National Natural Science Foundations of China [51778635, U1934207, 51978667]
- Natural Science Foundations of Hunan Province [2019JJ40386]
- Innovation-driven Plan in Central South University [20200017050004]
- Fundamental Research Funds of Central South University [2019zzts285]
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This study investigates the optimal ground motion intensity measure for high-speed railway girder bridges (HRGBs). Modal analysis reveals that the contribution of high-order modes cannot be ignored. A new intensity measure, S*, is proposed and found to be more feasible, efficient, and sufficient through probabilistic seismic demand analysis. An attenuation relationship based on S* is also proposed.
In the performance-based earthquake engineering framework, the ground motion intensity measure (IM) plays both the role of predicting structural seismic response and calculating seismic hazard curves. This study investigates the optimal ground motion IM for high-speed railway girder bridges (HRGBs). To that end, three representative HRGBs are selected for performing modal analysis first and results show that the vibration modes of HRGBs are scattered, and the contribution of high-order modes cannot be ignored. Then, a new intensity measure, S*, calculated by taking the spectral acceleration as the base and the mass participation coefficient as the index, is proposed. Through probabilistic seismic demand analysis (PSDA), compared with other 17 IMs, S* is more feasible, efficient and sufficient. Moreover, the attenuation relationship in terms of S* is proposed by simply modifying the existing attenuation models. Thus, S* is considered as the optimal IM for HRGBs.
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