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Home Projects Project Briefs NCHRP Project 10-70: Cost-Effective Connection Details for Highway Sign Luminaire and Traffic Signal Structures

 

Full scale fatigue testing of cantilevered highway sign/traffic signal and high level luminaire (high mast lighting) structures is being conducted at Lehigh University’s ATLSS Center and Fritz Laboratory as part of an ongoing research under NCHRP Project 10-70.

In the past two decades, fatigue cracking of these structures is increasingly being reported all over the United States, which has significant economic impact on the limited infrastructure resources. The provisions of the existing AASHTO specification are often inadequate in designing these structures against service limit state in fatigue and non-conformities exist between the recommended fatigue categories and the limited test results for these details. The current research encompasses assessment of fatigue performance of the welded connections that are commonly used in these structures. These welded connections include the socket connection, the groove welded connection, the stiffened sockets, the arm to pole gusset, the ring stiffened arm to pole connection, reinforced and un-reinforced hand holes, and jacket retrofits. In total, 74 specimens, including full size signal/sign structures and high mast towers, are being tested under this project, with 8 specimens tested simultaneously. To-date, this project is the largest comprehensive effort in evaluating fatigue performance of the subject structures around the world.

Recent Project

PITA Project: Integrated Framework using Monitoring and Reliability for Improved infrastructure Management under Uncertainty: Phases 1, 2, and 3

 

The aim of the PITA project is to develop a novel integrated framework using structural health monitoring and reliability technologies for improved bridge management under uncertainty. Through the use of new technologies and the employment of structural health monitoring and reliability approaches, the project is expected to have significant impact on bridge lifetime management practices.

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