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目前城市快速道路中龙门架的设置量越来越多,在风载和材料老化退化的综合作用下,针对龙门架基础安全性能评估的重要性日益凸显。由于快速道路桥梁结构上龙门架基础的特殊位置使得直接采用拉拔试验等方法难以实现。根据此特殊应用背景,利用声发射技术灵敏度高和早期损伤预报效果好等特点,对事件率和能量时程进行综合分析,结果显示:声发射信号能够较直观、准确地反映龙门架基础锚固的整体性能,该方法可以推广应用。
At present, more and more gantries are set in urban expressways, and the importance of evaluating gantry foundation safety performance has become increasingly prominent under the combined effect of wind load and material degradation. Due to the special position of the gantry foundation on the expressway bridge structure, it is difficult to directly adopt the pull test method. According to the special application background, using the characteristics of high sensitivity and early damage prediction of acoustic emission, the event rate and energy time history are comprehensively analyzed. The results show that the acoustic emission signal can reflect the gantry foundation anchorage more intuitively and accurately Overall performance, this method can be applied.