| 摘要: |
| 为了研究水工弧形钢闸门在正常运行工况时支臂受冲击作用下的动力响应问题,预估闸门可能会出现的破坏模式,以某水电站的弧形钢闸门为研究对象,采用非线性有限元方法模拟钢闸门在静水压力作用下的同时,支臂受浮木或落石冲击的过程,得到并分析弧形钢闸门支臂不同位置受冲击的冲击力、位移以及闸门整体的变形特征。结果表明,闸门破坏过程为受冲击的支臂或其斜杆首先发生面外失稳,随后靠近失稳支臂侧的闸门向铰支座方向移动,导致另一支臂承担的水压荷载瞬间增大而被压溃,最终导致闸门整体失稳发生破坏。随着浮木质量和冲击能量增加,冲击点受到的力和位移随着增大。当冲击能量低于2988 J时,即使支臂受冲击部位应力超过钢材屈服应力,闸门仍具有一定的稳定性；闸门支臂不同部位所能承受的最大冲击能量差异较大,冲击支臂近铰支座处位置易引起闸门结构失稳破坏；堰上水头越高,闸门支臂受冲击时越容易失稳。研究成果旨在为闸门受冲击时的安全性做出评判,明确闸门较易失稳的构件。 |
| 关键词: 弧形钢闸门 钢闸门支臂 动力响应 静水压力 等效应力 |
| DOI： |
| 分类号: |
| 基金项目:国家自然科学基金项目(No.52109167)，陕西省教育厅专项科研计划项目(No.21JK0803)，陕西省科技创新团队（2022TD-01） |
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| Nonlinear dynamic analysis of ally arm of steel arch-gate under impact load |
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DONG Jing1, BAI Yuhang1, PEI Duofei2, ZHANG Junfa1
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1.State Key Laboratory of Eco-hydraulics in Northwest Arid Region,Xi’an University of Technology,Xi’an;2.China Energy Engineering Group Shaanxi Electric Power Design Institute,Xi’an
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| Abstract: |
| In order to obtain the dynamic response of the hydraulic arc steel gate under the impact of the arm under normal operating conditions and predict the possible failure mode of the gate, the arc steel gate of a project is taken as the research object, and the nonlinear finite element method is used to consider the material nonlinearity and the large deformation of the structure. Under the action of hydrostatic pressure in normal operation, the impact process of different positions of the arm under the impact of floating wood or rockfall is simulated, and the impact force and displacement of the impact part of the arc gate and the overall deformation characteristics of the gate are obtained. The results show that the failure process of the gate arm under the impact load is that the out-of-plane instability of the impacted arm or its inclined rod occurs first, and the gate structure near the side of the unstable arm moves towards the hinge support, resulting in the instantaneous increase of the water pressure load borne by the other arm. Crushing, and then the overall instability and failure of the gate. The greater the floating wood mass and impact energy, the greater the impact point displacement and impact uniqueness. When the impact energy is less than 2988 J, the gate can still maintain a certain stability even if the stress of the impact part of the arm exceeds the yield stress of the steel. The energy required for the instability of the impact gate arm is different in different parts of the impact gate arm, and the impact arm near the hinge support is more likely to cause the loss of stability of the gate structure; the higher the head on the gate crest weir, the easier it is for the arm to lose stability under lateral impact. The research results can be used to judge the safety of the gate under external loads, and to clarify the components of the gate that are more prone to instability, which has important theoretical significance for improving the impact resistance safety of hydraulic structures. |
| Key words: radial steel gate steel gate arm dynamic response hydrostatic pressure equivalent stress |
