Aluminum light poles play a pivotal role in modern infrastructure, ensuring proper illumination along highways and in populated areas during nighttime. These poles typically feature handholes near their bases, providi...Aluminum light poles play a pivotal role in modern infrastructure, ensuring proper illumination along highways and in populated areas during nighttime. These poles typically feature handholes near their bases, providing access to electrical wiring for installation and maintenance. While essential for functionality, these handholes introduce a vulnerability to the overall structure, making them a potential failure point. Although prior research and analyses on aluminum light poles have been conducted, the behavior of smaller diameter poles containing handholes remains unexplored. Recognizing this need, a research team at the University of Akron undertook a comprehensive experimental program involving aluminum light poles with handholes containing welded inserts in order to gain a better understanding of their fatigue life, mechanical behavior, and failure mechanisms. The research involved testing seven large-scale aluminum light poles each 8-inch diameter, with two separate handholes. These handholes included a reinforcement that was welded to the poles. Finite Element Analysis (FEA), statistical analysis, and comparison analysis with their large counterparts (10-inch diameter) were used to augment the experimental results. The results revealed two distinct failure modes: progressive crack propagation leading to ultimate failure, and rupture of the pole near the weld initiation/termination site around the handhole. The comparison analysis indicated that the 8-inch diameter specimens exhibited an average fatigue life exceeding that of their 10-inch counterparts by an average of 30.7%. The experimental results were plotted alongside the fatigue detail classifications outlined in the Aluminum Design Manual (ADM), enhancing understanding of the fatigue detail category of the respective poles/handholes.展开更多
随着城市建设的快速推进,城市运行系统愈加复杂。燃气、供水、电力、交通、通信等城市生命线不断经历着改建、扩建和新建,基础设施种类不断增加,数量不断增多,规模不断增大。然而,目前我国大多数城市的监测预警手段方式还相对滞后,存在...随着城市建设的快速推进,城市运行系统愈加复杂。燃气、供水、电力、交通、通信等城市生命线不断经历着改建、扩建和新建,基础设施种类不断增加,数量不断增多,规模不断增大。然而,目前我国大多数城市的监测预警手段方式还相对滞后,存在重救援轻预防、重预案轻预警等问题。在信息与通信技术(Information and Communications Technology,ICT)技术的赋能下,智慧灯杆已成为智慧城市的数字基础设施,为更加有效解决城市生命线安全工程中的检测预警手段滞后的问题提供了新的思路。本文尝试一种以智慧灯杆为主要依托,以物联感知和视觉图像融合技术实现智能监测功能为基础,打造高度集成的、多功效的智能应用场景为目标,共同创新城市生命线安全监测系统的技术路径,实现城市生命线监管、研判效率,实现信息汇聚、预警研判、综合决策、高效处置的全流程闭环管理。展开更多
文摘Aluminum light poles play a pivotal role in modern infrastructure, ensuring proper illumination along highways and in populated areas during nighttime. These poles typically feature handholes near their bases, providing access to electrical wiring for installation and maintenance. While essential for functionality, these handholes introduce a vulnerability to the overall structure, making them a potential failure point. Although prior research and analyses on aluminum light poles have been conducted, the behavior of smaller diameter poles containing handholes remains unexplored. Recognizing this need, a research team at the University of Akron undertook a comprehensive experimental program involving aluminum light poles with handholes containing welded inserts in order to gain a better understanding of their fatigue life, mechanical behavior, and failure mechanisms. The research involved testing seven large-scale aluminum light poles each 8-inch diameter, with two separate handholes. These handholes included a reinforcement that was welded to the poles. Finite Element Analysis (FEA), statistical analysis, and comparison analysis with their large counterparts (10-inch diameter) were used to augment the experimental results. The results revealed two distinct failure modes: progressive crack propagation leading to ultimate failure, and rupture of the pole near the weld initiation/termination site around the handhole. The comparison analysis indicated that the 8-inch diameter specimens exhibited an average fatigue life exceeding that of their 10-inch counterparts by an average of 30.7%. The experimental results were plotted alongside the fatigue detail classifications outlined in the Aluminum Design Manual (ADM), enhancing understanding of the fatigue detail category of the respective poles/handholes.
文摘随着城市建设的快速推进,城市运行系统愈加复杂。燃气、供水、电力、交通、通信等城市生命线不断经历着改建、扩建和新建,基础设施种类不断增加,数量不断增多,规模不断增大。然而,目前我国大多数城市的监测预警手段方式还相对滞后,存在重救援轻预防、重预案轻预警等问题。在信息与通信技术(Information and Communications Technology,ICT)技术的赋能下,智慧灯杆已成为智慧城市的数字基础设施,为更加有效解决城市生命线安全工程中的检测预警手段滞后的问题提供了新的思路。本文尝试一种以智慧灯杆为主要依托,以物联感知和视觉图像融合技术实现智能监测功能为基础,打造高度集成的、多功效的智能应用场景为目标,共同创新城市生命线安全监测系统的技术路径,实现城市生命线监管、研判效率,实现信息汇聚、预警研判、综合决策、高效处置的全流程闭环管理。
