Influence of the multi-pulse near-fault earthquake motion on the seismic risk evaluation for reinforced concrete bridge
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Influence of the multi‑pulse near‑fault earthquake motion on the seismic risk evaluation for reinforced concrete bridge Chunxu Xia1 · Chunguang Liu2 Received: 1 November 2018 / Accepted: 17 December 2019 © Springer Nature B.V. 2020
Abstract The multi-pulse near-fault earthquake motion imposes unique influence on the seismic risk for bridge structure. Regarding the different character of multiple pulse-like waveforms embedded in the near-fault seismic signal, the mother wavelet in wavelet analysis should be adaptively selected for best representation of the embedded multi-pulse seismic signal. A novel adaptive mother wavelet selection procedure is proposed to identify the optimum mother wavelet for each dominant pulse. The seismic risk for the example bridge system is analyzed by incremental dynamic analysis. The result indicates that the identified most unfavorable seismic signal dominates the bridge system fragility compared with the recorded horizontal signals. The top and bottom boundary of the expected annual loss ratio of the unfavorable seismic signal is 4.67% and 6.22% larger than the average value of recorded horizontal signals, respectively. It is necessary to consider the influence of the identified unfavorable seismic signal on the seismic risk for the bridge system compared with the recorded horizontal seismic signals. Keywords Near-fault earthquake · Pulse-like waveform · Continuous wavelet transform · Adaptive mother wavelet selection · Incremental dynamic analysis · Seismic risk
1 Background The seismic risk evaluation is an effective method to manage the safety of the existing structures. It involves the seismic hazard analysis, structural fragility analysis, and the postearthquake loss evaluation (Mander et al. 2007). Seismic hazard analysis has been under full development since proposed by Cornell (1968). It describes the annual exceeding probability of specific seismic intensity that may attack specific area or engineering site. Fragility curves describe the conditional probability, namely the likelihood of a structure being damaged beyond a specific damage level for a given ground motion intensity (Billah and Alam 2015; Li et al. 2016). The fragility or conditional probability can be expressed * Chunxu Xia [email protected] 1
College of Architectural Engineering, Dalian University, Dalian 116622, Liaoning, China
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Institute of Earthquake Engineering, Dalian University of Technology, Dalian 116024, Liaoning, China
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Natural Hazards
as Eq. (1), where IM is seismic intensity; C and DI is the limit state and the actual damage level of the structural members or the structural system, respectively. A detailed review of the seismic fragility evaluation can be found in reference (Billah and Alam 2015). In order to get the representative parameter for the seismic intensity, Ye et al. (2009) summarized 33 existing seismic intensity indices. The seismic responses of elastic–plastic SDOF and MDOF systems were also studied. The applicability and characteristics of these s
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