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含缝拱坝强震失效破坏振动台研究
Shaking table test on impact of joints on dynamic failure mechanism of Arch Dam
投稿时间:2020-04-03  修订日期:2020-04-22
DOI:
中文关键词:  拱坝  振动台试验  失效模式  极限承载能力  横缝  诱导缝
英文关键词:arch dam  shaking table test  failure mode  overload capability  contraction joints  induced joints
基金项目:国家自然科学基金项目(面上项目,重点项目,重大项目)
作者单位E-mail
张宇 东北石油大学 zhangyu@nepu.edu.cn 
范哲 中国水利水电科学研究院  
周利剑 东北石油大学  
卢召红 东北石油大学  
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中文摘要:
      为探究强震时含缝拱坝结构承载能力及失效路径,在振动台上开展了一系列拱坝模型强震失效破坏试验。基于弹性力-重力准则设计试验,分别进行了不分缝、只有横缝、诱导缝与横缝联合作用这三种情况的振动台模型试验,试验中考虑了材料率相关性的影响,忽略了库水-拱坝相互作用。试验表明,强震作用时由于设缝处的抗拉能力较低导致缝位置较早发生开裂,拱向应力的传导路径遭到破坏,此后结构破坏以悬臂梁形式为主;科学合理设置缝,可以有效耗散地震能量,提高拱坝极限承载能力。本文研究结果可为高拱坝的抗震分缝设计和超载能力评估提供试验依据。
英文摘要:
      In order to investigate the overload capacity and failure mode of arch dam considering the joints during a strong earthquake, a series of arch dam model failure tests were carried out on a shaking table. Based on the elasticity-gravity similarity law, shaking table tests were performed for three cases: no joints, only contraction joints, induced joints and contraction joints. In these experiments, the influence of material rate correlation was considered, and the dam-foundation interaction was ignored. The results show that during strong earthquakes, cracks occur earlier in the joint position due to the lower tensile capacity, and the arch-stress transmission path is damaged. After that, the structural damage is mainly in the form of cantilever beams.The scientific and reasonable setting of joints can effectively dissipate seismic energy and improve the overload capability of arch dams. The research results in this paper can provide experimental basis for the seismic design of joints and assessment of overload capacity of high arch dams.
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