Non-Destructive dynamic detection and safety evaluation of sluice after Wen-Chuan seismic shock

Taking sluice structure of YingXiuWan hydropower station which lies on the seismic center of Wen-Chuan strong seismic shock as example, this paper carries out the dynamic Non-Destructive detection based on vibration theory. The sluice structure dynamic response is measured under flood discharge excitation, and the operational modal parameter of sluice is identified with output response only. Based on the modal parameter identification result and numerical result, the sluice security after seismic shock is evaluated. The method put forward in this paper does not affect the normal work of structure and reduces the artificial work and equipment invests, and has broad application prospects.