考虑键槽咬合作用的高拱坝非线性横缝模型研究

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振动与冲击 ›› 2022, Vol. 41 ›› Issue (20) : 216-224.

论文

彭刚1,2，洪海丰2，陈灯红1,2，杨紫辉2，赵艺园2，曹文昱3

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A nonlinear transverse joint model of high arch dams considering the interaction of shear keys

PENG Gang1,2,HONG Haifeng2,CHEN Denghong1,2,YANG Zihui2,ZHAO Yiyuan2,CAO Wenyu3

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摘要

为了精确模拟高拱坝横缝键槽在地震作用下的力学响应，研究了高拱坝横缝键槽咬合作用，并构建了一种带附加切向弹簧刚度的平缝模型。通过调节平缝模型的附加切向弹簧刚度系数可以实现与精细化模型精度相当的咬合作用，并探讨了该模型附加切向刚度系数的取值及其稳定性。将锦屏一级高拱坝作为工程算例，重点研究了键槽咬合作用对横缝的法向开度和切向位移的影响。结果表明：联结单元引入到动接触边界模型，不仅能较好地模拟键槽咬合作用，而且能改善单一动接触力模型的两侧坝体互相嵌入。键槽咬合作用能够加强拱坝的整体性，有效地限制横缝的切向位移，并使横缝的法向开度小幅降低。
关键词：横缝；键槽咬合；附加切向弹簧刚度；法向开度；切向位移

Abstract

In order to accurately simulate the mechanical response of the shear keys of the transverse joint of the high arch dam under the seismic action, the interaction of shear keys of transverse joints in high arch dams is studied, and a flat joint model with additional tangential spring stiffness is constructed in this paper. By adjusting the additional tangential spring stiffness coefficient of the flat joint model, the interaction effect equivalent to the precision of the refined model can be achieved, and the value and stability of the additional tangential stiffness coefficient of the model are discussed. Taking the Jinping I high arch dam as an engineering example, the influence of interaction of shear keys on the normal opening and tangential displacement of the transverse joints is investigated. The results show that the introduction of the coupling element into the dynamic contact boundary model can not only simulate the interaction of shear keys, but also improve the embedding of the arch dams on both sides of the single dynamic contact force model. The interaction of shear keys can strengthen the integrity of the arch dam, effectively limit the tangential displacement of the transverse joints, and slightly reduce the normal opening of the transverse joints.
Key words: transverse joint; interaction of shear keys; additional tangential spring stiffness; normal opening; tangential displacement

导出引用

彭刚1,2，洪海丰2，陈灯红1,2，杨紫辉2，赵艺园2，曹文昱3. 考虑键槽咬合作用的高拱坝非线性横缝模型研究[J]. 振动与冲击, 2022, 41(20): 216-224

PENG Gang1,2,HONG Haifeng2,CHEN Denghong1,2,YANG Zihui2,ZHAO Yiyuan2,CAO Wenyu3. A nonlinear transverse joint model of high arch dams considering the interaction of shear keys[J]. Journal of Vibration and Shock, 2022, 41(20): 216-224

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