Mechanical effects of excavation rebound of arch dam bedrock and better concreting time of dam body

Mechanical effects of excavation rebound of arch dam bedrock and better concreting time of dam body
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拱坝基岩开挖回弹力学效应及坝体较好混凝土浇筑时间

DOI:
10.1007/s11431-009-0043-2
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发表时间:
2009-02
期刊:
Science in China Series E-Technological Sciences
影响因子:
--
通讯作者:
GUO HaiQing
GUO HaiQing
中科院分区:
其他
文献类型:
--
作者:
WU ZhongRu;GU YanChang;SU HuaiZhi;GUO HaiQing

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本文提出了一个非线性模型,用于分析拱坝在不同地震输入机制下的损伤开裂行为。该非线性系统包括考虑应变软化的混凝土塑性损伤模型和收缩缝张开的接触边界模型。采用两种不同的地震输入机制进行比较,包括无质量地基输入模型和考虑无限大峡谷辐射阻尼的粘弹性边界模型。结果表明,地震输入机制和辐射阻尼对大坝的非线性响应和损伤开裂有显著影响。与采用无质量地基输入模型的计算结果相比,采用粘弹性边界模型考虑辐射阻尼时,损伤开裂区域和缩缝张开度均显著减小。然而,如果人为地将无质量地基输入模型的阻尼比增加到10%~ 15%,则坝体的接缝张开和损伤开裂与粘弹性边界模型的结果相当。
In this study, a nonlinear model is presented for analysis of damage-cracking behavior in arch dams during strong earthquakes using different seismic input mechanisms. The nonlinear system includes a plastic-damage model for cyclic loading of concrete considering strain softening and a contact boundary model of contraction joint opening. Two different earthquake input mechanisms are used for comparison, including massless foundation input model and viscous-spring boundary model considering radiation damping due to infinite canyon. The results demonstrate that effects of seismic input mechanism and radiation damping on nonlinear response and damage-cracking of the dam are significant. Compared with the results of using massless foundation input model, the damage-cracking region and contraction joint opening are substantially reduced when using viscous-spring boundary model to take into account radiation damping. However, if the damping ratio of the dam is artificially increased to about 10%–15% for massless foundation input model, the joint opening and damage-cracking of the dam are comparable to the results obtained from the viscous-spring boundary model.
DOI: --
发表时间: 1999
期刊: --
影响因子: --
作者:
Yuanzhe Zhi
通讯作者: Yuanzhe Zhi
DOI: --
发表时间: 2008
期刊: 岩土力学
影响因子: --
作者:
Gu, Yan-Chang;Guo, Hang-Zhong;Zheng, Dong-Jian;He, Xian-Feng
通讯作者: He, Xian-Feng
DOI: 10.1007/s11431-007-6005-7
发表时间: 2007-08
影响因子: 4.6
作者:
Gu Chong-shi;W. Yuan;Su Huaizhi;Tan Lihui
通讯作者: Gu Chong-shi;W. Yuan;Su Huaizhi;Tan Lihui
DOI: --
发表时间: 2008
期刊: 水力发电学报
影响因子: --
作者:
Gu, Yanchang;Jing, Ji;Jin, Yongqiang;Cong, Peijiang
通讯作者: Cong, Peijiang
DOI: 10.1007/s11431-007-6003-9
发表时间: 2007
期刊: Science in China Series E: Technological Sciences
影响因子: --
作者:
Zhongru Wu;Ji Li;C. Gu;H. Su
通讯作者: Zhongru Wu;Ji Li;C. Gu;H. Su