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A simplified iterative approach for testing the pulse derailment of light rail vehicles across a viaduct to near-fault earthquake scenarios
- Source :
- Proceedings of the Institution of Mechanical Engineers, Part F: Journal of Rail and Rapid Transit. 235:1172-1188
- Publication Year :
- 2021
- Publisher :
- SAGE Publications, 2021.
-
Abstract
- Near-fault (NF) earthquakes cause severe bridge damage, particularly urban bridges subjected to light rail transit (LRT), which could affect the safety of the light rail transit vehicle (“light rail vehicle” or “LRV” for short). Now when a variety of studies on the fault fracture effect on the working protection of LRVs are available for the study of cars subjected to far-reaching soil motion (FFGMs), further examination is appropriate. For the first time, this paper introduced the LRV derailment mechanism caused by pulse-type near-fault ground motions (NFGMs), suggesting the concept of pulse derailment. The effects of near-fault ground motions (NFGMs) are included in an available numerical process developed for the LRV analysis of the VBI system. A simplified iterative algorithm is proposed to assess the stability and nonlinear seismic response of an LRV-reinforced concrete (RC) viaduct (LRVBRCV) system to a long-period NFGMs using the dynamic substructure method (DSM). Furthermore, a computer simulation software was developed to compute the nonlinear seismic responses of the VBI system to pulse-type NFGMs, non-pulse-type NFGMs, and FFGMs named Dynamic Interaction Analysis for Light-Rail-Vehicle Bridge System (DIALRVBS). The nonlinear bridge seismic reaction determines the impact of pulses on lateral peak earth acceleration (Ap) and lateral peak land (Vp) ratios. The analysis results quantify the effects of pulse-type NFGMs seismic responses on the LRV operations' safety. In contrast with the pulse-type non-pulse NFGMs and FFGMs, this article's research shows that pulse-type NFGM derail trains primarily via the transverse velocity pulse effect. Hence, this study's results and the proposed method can improve the LRT bridges' seismic designs.
- Subjects :
- Derailment
business.industry
Mechanical Engineering
020101 civil engineering
02 engineering and technology
Structural engineering
Hazard analysis
Near fault
Bridge (nautical)
0201 civil engineering
Pulse (physics)
020303 mechanical engineering & transports
0203 mechanical engineering
Light rail
Light rail transit
business
Geology
Subjects
Details
- ISSN :
- 20413017 and 09544097
- Volume :
- 235
- Database :
- OpenAIRE
- Journal :
- Proceedings of the Institution of Mechanical Engineers, Part F: Journal of Rail and Rapid Transit
- Accession number :
- edsair.doi...........256b8f1583a064e61b15aca864b976c5