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RISS 인기검색어
- 검색키워드
- 저자 : Marc A. Hoffmann (검색결과 3 건)
- 무료
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- 유료
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A case study of protecting bridges against overheight vehicles
Aly Mousaad ALY,Marc A. Hoffmann 국제구조공학회 2022 Steel and Composite Structures, An International J Vol.43 No.2
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.
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Marina Ebert,Jessica D. Hoffmann,Zorana Ivcevic,Christine Phan,Marc A. Brackett 대한사고개발학회 2015 The International Journal of Creativity & Problem Vol.25 No.2
A workshop was designed to teach professional adults a set of creativity (problem finding and idea generation) and emotional intelligence (using emotions to facilitate thinking and understanding emotions) skills through engagement with the visual arts. Skills were developed and practiced over eight sessions and applied to real-life problems identified by participants. After participating in the workshop, participants showed more positive attitudes towards creativity, emotional intelligence, and art appreciation. Participants reported higher self-perceived creative and emotion skills and expressed high satisfaction with the workshop.
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Teaching Emotion and Creativity Skills through Art: A Workshop for Children
Marina Ebert,Jessica D. Hoffmann,Zorana Ivcevic,Christine Phan,Marc A. Brackett 대한사고개발학회 2015 The International Journal of Creativity & Problem Vol.25 No.2
This paper reports on the development and initial validation of a workshop teaching emotion skills (perceiving, using and understanding emotions) and creativity skills (problem finding and idea generation) through engagement with the visual arts to children ages 6-12 years old. After completing the six-session workshop, children showed greater knowledge of how emotions can be used to facilitate thinking and behavior in everyday life scenarios, and reported being less likely to settle on their first idea when making art. Children positively evaluated their experiences in the workshop and indicated interest in similar art-based learning opportunities in the future.
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