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| 1 | Three-dimensional modelling of shear keys in concrete gravity dams using an advanced grillage method显示文摘Contraction joint shear keys are resilient features of gravity dams that can be considered to increase the sliding safety factors or minimise seismic residual sliding displacements,allowing costly remedial actions to be avoided.This paper presents a novel,robust,and computationally efficient three-dimensional(3D)modelling and simulation strategy of gravity dams,using a series of adjacent cantilever beam elements to represent individual monoliths.These monoliths are interconnected in the longitudinal direction by 3D no-tension link elements representing the lumped shear key stiffness contributions at a particular elevation.The objective is to assess the shear key internal force demands,including the axial force,shear,and moment demands.Shear key demand-capacity ratios can then be assessed with related multi-axial failure envelopes.The 3D link element stiffness coefficients were derived from a series of 3D finite element(FE)solid models with a detailed representation of geometrical features of multiple shear keys.The results from the proposed method based on advanced grillage analysis show strong agreement with reference solutions from 3D FE solid models,demonstrating high accuracy and performance of the proposed method.The application of the proposed advanced grillage method to a dam model with two monoliths clearly shows the advantage of the proposed method,in comparison to the classical approach used in practise. | Mahdi Ben Ftima Steephane Lafrance Pierre Leeger | 2020 | Water Science and Engineering2020，13，3： | 1 |
| 2 | 考虑键槽咬合作用的高拱坝非线性横缝模型研究显示文摘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。 | 彭刚 洪海丰 陈灯红 杨紫辉 赵艺园 曹文昱 | 2022 | 振动与冲击2022，41，20： | 1 |
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