EMERGING APPLICATIONS OF HIGH PERFORMANCE STEEL AND ULTRASOUND IMPACT TREATMENT

[mowafi3m]

EMERGING APPLICATIONS OF HIGH PERFORMANCE STEEL AND ULTRASOUND IMPACT TREATMENT FOR IMPROVED FATIGUE LIFE OF STEEL BRIDGES

Abstract ; Statnikov E. S.2; and Tehini L.3
With the advent of high performance materials, emerging advanced technologies and emphasis on the Federal Highway Administration’s (FHWA) Strategic Goals to mitigate congestion during construction as well as during the service life of a structure, the national perspective in the highway industry is changing towards rapid construction of highways and bridges; as well as to the deployment of maintenance techniques that can be performed quickly, economically, and effectively to achieve long lasting structures to safely transport people and goods.
This paper highlights recent advances in High Performance Steels (HPS) and maintenance technique employing Ultrasonic Impact Treatment (UIT) for steel bridges. These bridges will last longer, resist corrosion and fatigue cracking, and can be maintained efficiently and economically compared to those built and maintained in a traditional manner using conventional bridge steels. This material (steel) development effort has led to high strength 50-100 ksi (345 to 690 MPa yield strength), improved weldability, high toughness, and improved weathering (atmospheric corrosion resistant). Currently, high performance steel grades: HPS 50W, HPS 70W and HPS 100W are available. For the reasons explained above, this paper will address (a) Construction of New Structures Using High Performance Steels (HPS) and, (b) Maintenance of Structures Using Ultrasonic Impact Treatment (UIT).

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1.31MB,16 pages