• Steel and Composite Structures
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• 제43권2호
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• pp.165-183
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• 2022

Most transportation departments have recognized and developed procedures to address the ever-increasing weights of trucks traveling on bridges in a service today. Transportation agencies also recognize the issues with overheight vehicles' collisions with bridges, but few stakeholders have definitive countermeasures. Bridges are becoming more vulnerable to collisions from overheight vehicles. The exact response under lateral impact force is difficult to predict. In this paper, nonlinear impact analysis shows that the degree of deformation recorded through the modeling of the unprotected vehicle-girder model provides realistic results compared to the observation from the US-61 bridge overheight vehicle impact. The predicted displacements are 0.229 m, 0.161 m, and 0.271 m in the girder bottom flange (lateral), bottom flange (vertical), and web (lateral) deformations, respectively, due to a truck traveling at 112.65 km/h. With such large deformations, the integrity of an impacted bridge becomes jeopardized, which in most cases requires closing the bridge for safety reasons and a need for rehabilitation. We proposed different sacrificial cushion systems to dissipate the energy of an overheight vehicle impact. The goal was to design and tune a suitable energy absorbing system that can protect the bridge and possibly reduce stresses in the overheight vehicle, minimizing the consequences of an impact. A material representing a Sorbothane high impact rubber was chosen and modeled in ANSYS. Out of three sacrificial schemes, a sandwich system is the best in protecting both the bridge and the overheight vehicle. The mitigation system reduced the lateral deflection in the bottom flange by 89%. The system decreased the stresses in the bridge girder and the top portion of the vehicle by 82% and 25%, respectively. The results reveal the capability of the proposed sacrificial system as an effective mitigation system.

• 한국정보통신학회논문지
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• 제24권7호
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• pp.849-856
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• 2020

최근 2층 버스 등 전고가 높은 차량이 증가함에 따라 지정된 경로 이탈 및 운전자 부주의로 인해 교량 및 터널 등에서 차량 상부 충돌 사고가 발생하고 있다. 기존 전방 충돌 경고 시스템의 경우 차량 및 보행자 등에 한정되어 경고를 발생하기 때문에 전고가 높은 차량을 위한 통과 높이 경고 시스템으로는 사용이 어렵다. 이에 본 논문에서는 복수개의 라이다 센서를 사용하여 세그먼트별 데이터의 상관도 및 시계열 특성을 판단한 후 차량 상부 충돌 가능성을 미리 판단하여 경고를 발생시키는 시스템을 제안한다. 또한, 제안하는 시스템은 실도로 주행 테스트 및 한국 자동차 안전 연구원에서 시스템 성능 평가를 통해 정상 동작을 확인하였다.