Abstract
In recent years, heavy rainfall disasters have caused frequent damage to bridge piers due to scouring and have resulted in the fall of bridges in many areas in Japan. The objective of this study was to investigate the effect of local scouring around the downstream of the piers on the local scouring around the center of the river flowing at an angle to the piers. It was found that when the center of the river flows at an angle to the piers, the scouring area becomes wider from the upstream to the downstream of the piers because of the longer inhibition width of the piers positioned perpendicular to the water flow. The downstream scouring depth tends to be smaller than the upstream scouring depth. In addition, the time to the onset of tilting deformation of the piers increases with the inhibition width of the piers positioned perpendicular to the flowing water.
Highlights
In recent years, heavy rainfall disasters have caused frequent damage to bridge piers due to scouring and have resulted in the fall of bridges in many areas of Japan, e.g., in July 2017, when the collapse of piers and outflow of girders of a railway bridge occurred due to heavy rainfall in the northern part of the Kyushu area
In July 2018, the inclination of a pier and outflow of girders of a railway bridge were caused by heavy rainfall in western Japan
In July 2020, the collapse of piers and outflow of girders of a railway bridge were caused by heavy rainfall in the southern part of the Kyushu area
Summary
Heavy rainfall disasters have caused frequent damage to bridge piers due to scouring and have resulted in the fall of bridges in many areas of Japan, e.g., in July 2017, when the collapse of piers and outflow of girders of a railway bridge occurred due to heavy rainfall in the northern part of the Kyushu area. In July 2020, the collapse of piers and outflow of girders of a railway bridge were caused by heavy rainfall in the southern part of the Kyushu area When this type of disaster occurs, it has a significant impact on the transportation network and on the daily lives of people. In Japan, the Ministry of Land, Infrastructure, Transport and Tourism requires regular inspection of once every two years for railways and once every five years for roads It is difficult for an engineer engaged in the maintenance practice of bridges to perform a detailed investigation for the purpose of clarifying the safety and soundness on a daily basis because there are many aspects that require maintenance. It is common to conduct a simple investigation based on visual methods and by using a tape measure
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