
预应力锚索的张拉次序对闸墩应力及变形的影响研究
王己海, 费文平
预应力锚索的张拉次序对闸墩应力及变形的影响研究
Research on the Influence of Tensioning Sequence of Prestressed Anchor Cable on Stress and Deformation of Piers
预应力闸墩是大型泄水建筑物的重要结构,预应力锚索的张拉次序直接影响到闸墩结构受力、变形及结构安全。结合四川某水库2号溢流坝段工程,提出了适合本工程的交错式对称张拉法,采用三维有限元法,对比分析了两种不同的锚索张拉次序对闸墩在各工况下的应力状况及变形规律的影响。计算结果表明,闸墩的应力状态和变形规律较大程度地受锚索张拉次序的影响,交错式对称张拉法可以明显地改善闸墩的应力状态。研究结果旨在探索预应力锚索的张拉次序对闸墩应力及变形的影响,同时为提高闸墩结构安全提供一种新方法。
Prestressed gate pier is an important structure of large discharge structure, and the tensioning sequence of prestressed anchor cable directly affects the stress, deformation and structural safety of the pier structure. In this paper, a staggered symmetric tensioning method suitable for the project is put forward in combination with the No.2 overflow dam section of a reservoir in Sichuan Province. The influence of two different tensioning sequences of anchor cables on the stress state and deformation law of the pier under various working conditions is compared and analyzed by using the three-dimensional finite element method. The calculation results show that the stress state and deformation law of the pier are greatly affected by the tensioning sequence of the anchor cable, and the staggered symmetrical tensioning method can obviously improve the stress state of the pier. The research results have an important guiding significance for this project and important reference value for similar projects.
闸墩 / 预应力锚索 / 张拉次序 / 有限单元法 {{custom_keyword}} /
pier / prestressed anchor cable / tensioning sequence / finite element method {{custom_keyword}} /
表1 数值计算参数表Tab.1 Parameters for numerical modelling |
材料名称 | 弹性模量E/GPa | 密度ρ/(kg·m-3) | 泊松比v | 凝聚力C/ MPa | 内摩擦角φ/(º) | 线膨胀系数 α |
---|---|---|---|---|---|---|
闸墩混凝土 | 28 | 2400 | 0.167 | 1.2 | 35 | - |
锚块混凝土 | 32.5 | 2450 | 0.167 | 1.4 | 40 | - |
锚索 | 195 | 7850 | 0.26 | - | - | 1.2×10-5 |
图6 不同方案下次锚索C1~C14的应力变化Fig.6 Stress variation of sub-major anchor cable C1~C14 under different schemes |
图7 不同方案下主锚索A1~A12的应力变化Fig.7 Stress variation of main anchor cable A1~A12 under different schemes |
图10 方案二与方案四预压后次锚索锚定面上σ 1等值线图(单位:Pa)Fig.10 Contours of σ 1 on the anchoring surface of sub-major anchor cable by scheme 2 and scheme 4 |
图13 不同方案闸墩X向的位移变化Fig.13 X-direction displacement change of pier in different schemes |
图14 不同方案闸墩Y向的位移变化Fig.14 Y-direction displacement change of pier in different schemes |
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