Abstract: The vibration property of dam body is a significant indicator reflecting the security of high roller compacted concrete(RCC) dam under flood discharge. To reveal the response characteristics of damage vibration of high RCC dam, we analyzed and compared the regularities of flow-induced vibration response of dam body in conditions of no damage, crack damage, layered damage, and double damage via theoretical analysis and numerical simulation based on the theory of high RCC arch dam engineering and the damaged structural indicators of typical dam body cracks and layered RCC structures.Results showed that lower rolling layer strength, larger rolling thickness, and more rolling layers could exaggerate the vibration response. By establishing four damage models of different rolling layers and crack damages to analyze the dynamic response, we found that both layer structure and crack damage structure could expand the dynamic response on crown beam,abutment and the damaged sites, and in addition, affect each other in the presence of two patterns of damage,further boosting the dynamic displacement of the dam body, which is the most unfavorable for dam safety.

Key words: high RCC, arch dam, no damage, crack damage, layered damage, double damage, flow-induced vibration