关键词: 超声波冲击, 焊接残余应力, 锚拉板区域, 斜拉桥

Abstract: To solve problems in anchor plate of long-span cable-stayed bridge such as dense welds, thick connecting plates, and high and unknown distribution of welding residual stress, three full-scale ratio models are proposed. These are applied to cable-beam connection of anchorage area of Chongqing Jiangjin Guanyinyan Yangtze River Bridge. Welding residual stress was tested, and ultrasonic impact imposed on welds of the models. Ultrasonic impact can make weld toe as the center of a certain region producing sufficient deep surface of plastic deformation. It effectively improves welds and baseplates exterior shape of the transitional zone, and reduces stress concentration in the welds. Test results show that there is significant welding residual stress in the anchorage areas of tensile anchor plates, and ltrasonic impact can effectively reduce, even release, welding residual stress and improve the status of stress of welds. Ultrasonic impact can make the stress distribution in the welds more uniform, ensuring safety of the cable beam connection of anchorage area. In conclusion, ultrasonic impact is an effe
ctive method for solving the welding residual stress problem.

Key words: anchorage area, ultrasonic impact, welding residual stress, cable-stayed bridge