Traffic load monitoring under heavy load traffic and development of structural and environmental monitoring method for infrastructures

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This research focused on innovative maintenance technologies for infrastructure especially for steel bridges and sign and lighting structures on viaducts. The following themes are discussed.1) Bridge Weigh-in-Motion and its application for environmental monitoring.A truck load survey was carried out the National Route 19 by Bridge Weigh-in-Motion. A synchronized monitoring of truck load and traffic induced noise of bridge joint was carried out at Kojima Viaduct of Higashi Meihan Expressway. The effect of truck load and vehicle speed on the noise level was discussed.2) Fatigue durability assessment of steel bridgesFatigue tests of fillet weld joints, such as cover plated end details and tensile plates with fillet welded pipes, were carried out. A new method of fatigue durability assessment was developed. Several strengthening methods of welded joint were discussed.3) Vibration and fatigue problem of sign and lighting structure on viaducts.Vibration reduction methods for sign structures on viaducts were developed. A feasibility study of visual observation for vibration rating was carried out.4) Digital image analysis for structural health monitoring.A simple method of surface profile measurement for corroded steel surface was developed.