摘要
地震下重力坝的开裂扩展机理是大坝抗震安全评价的重要研究内容,因此,建立合适的抗震分析模型至关重要.论文基于扩展有限元法,考虑了缝面水压力的影响并采用黏弹性人工边界模型仿真模拟了大坝地震开裂过程,并分析探讨了不同的抗震分析模型对大坝地震开裂过程的影响.结果表明:黏弹性人工边界更全面地考虑了诸如远场阻尼、地基弹性恢复力等不同因素对结构动响应的影响;相较于黏弹性人工边界模型,无质量刚性地基抗震分析模型放大了大坝的地震动响应;考虑黏弹性边界且采用有质量弹性地基时的裂纹扩展路径较平缓,裂纹扩展长度也较小,且最大裂纹宽度减小了约19%.
The crack propagation mechanism of gravity dams under earthquakes is an important research content in aspects of dam earthquake-resistant safety evaluation.Therefore,it is very important to establish an appropriate seismic analysis model.In this paper,based on the extended finite element method,considering the influence of water pressure on the joint surface,the viscoelastic artificial boundary model is used to simulate the seismic cracking process of the dam,and the influence of different seismic analysis models on the seismic cracking process of the dam is analyzed and discussed.The results show that the viscoelastic artificial boundary model can consider more comprehensively the effects of different factors,such as far-field damping and elastic recovery force of foundation on the dynamic response of the structure.Compared with the viscoelastic artificial boundary model,the seismic analysis model of massless rigid foundation amplifies the dynamic responses of dams.Considering viscoelastic boundary and using mass elastic foundation,the crack propagation path is gentle,the crack propagation length is small,and the maximum crack width decreases by about 19%.
作者
徐浩
江守燕
杜成斌
XU Hao;JIANG Shouyan;DU Chengbin(Department of Engineering Mechanics,Hohai Univ.,Nanjing 210098,China)
出处
《三峡大学学报（自然科学版）》
CAS
2021年第3期12-17,共6页
Journal of China Three Gorges University：Natural Sciences
基金
国家自然科学基金项目(51579084)
国家重点研发计划(YS2018YFE011362)。
关键词
黏弹性边界
缝面水压
地震动输入
裂纹扩展
ABAQUS
扩展有限元法
viscoelastic boundary
water pressure along fracture surface
ground motion input
crack propagation
ABAQUS
extended finite element methods
