强震作用下泄水建筑物混凝土损伤分析及抗震配筋措施研究  

Damage Analysis and Seismic Reinforcement Measures of Concrete in Discharge Structures Under Strong Earthquakes

作　　者：刘世骏 戴波 王亚坤 LIU Shi-jun;DAI Bo;WANG Ya-kun(Nanjing Hydraulic Research Institute,Nanjing 210029,China)

机构地区：[1]南京水利科学研究院,江苏南京210029

出　　处：《水电能源科学》2024年第6期106-110,共5页Water Resources and Power

基　　金：国家重点研发计划(2022YFC3005405);国家自然科学基金联合基金项目(U23B20150);水利部重大科技项目(SK-2022096);云南省科技计划项目(202203AA080009);中央级公益性科研院所基本科研业务费专项资金项目(Y723003)。

摘　　要：地震作用下混凝土结构会产生不同程度的损伤开裂,这直接影响强震频发区水电站的运行安全,在工程实践中配筋作为常见的抗震措施,但具体方案却不够明确。为此,以西南地区某水电站泄水建筑物为例,采用混凝土塑性损伤模型对溢流坝进行动力时程有限元计算,分析强震荷载作用下坝体拉伸损伤的发展特性。在此基础上,考虑不同局部配筋加固方案,应用分离式模型模拟结构的动力特征和动力响应,研究不同局部配筋措施的抗震效果。结果表明,动力损伤分析得出的拉伸损伤严重部位作为配筋区域较为合理,局部配筋有效改善了坝体的抗震性能,且对钢筋数量与间距进行调整后可进一步优化抗震效果,为工程中溢流坝的抗震配筋加固设计提供了参考。Under seismic conditions,concrete structures undergo varying degrees of damage and cracking,directly impacting the operational safety of hydroelectric stations in earthquake-prone regions.In engineering practice,reinforcement with steel bars is a common seismic mitigation measure,yet specific strategies are not sufficiently clear.This paper focuses on the spillway structure of a hydroelectric plant in the southwestern region.It employs a concrete plastic damage model for dynamic time-history finite element analysis to examine the development characteristics of tensile damage in the spillway dam under strong seismic loads.Building upon this analysis,various local steel reinforcement schemes are considered.A segregated model is applied to simulate the dynamic characteristics and responses of the structure,investigating the seismic resistance effects of different local reinforcement measures.The results indicate that identifying regions with severe tensile damage through dynamic damage analysis is a reasonable approach for determining reinforcement areas.Local steel reinforcement effectively improves the seismic performance of the dam,and further optimization of seismic effects is achievable by adjusting the quantity and spacing of the steel bars.The study provides valuable reference for the seismic reinforcement design of spillway structures in engineering projects.

关 键 词：强震荷载 泄水建筑物 动力响应分析 抗震措施 

分 类 号：TV332[水利工程—水工结构工程]