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为探讨山区高墩桥梁墩顶位移超限的成因,本研究以某山区高墩桥梁为例建立了三维有限元模型,采用弹簧单元模拟了支座偏压并考虑了几何非线性,比较了线路纵坡、墩高、线路曲率半径和支座摩擦系数对墩顶位移的影响。计算结果表明:当支座处于偏压状态时,尤其是分联桥墩所在位置,升降温循环作用是产生墩顶向上坡侧位移的主要因素,且随着支座偏压和墩高的增加而增大;线路曲率半径对墩顶位移影响较小;支座钢板部分锈蚀所致的前后滑动摩擦系数不同是最终导致墩顶位移逐渐累积超限的主要原因。
In order to explore the cause of the over-limit of the pier displacement in the high-pier bridge, a three-dimensional finite element model was established by taking the high pier in a mountainous area as an example. The spring element was used to simulate the bearing bias and geometric nonlinearity was considered. Influence of Longitudinal Slope, Pier Heights, Line Radius of Radius and Bearing Coefficient of Friction on Pier Top Displacement. The calculation results show that when the support is in a biased state, especially the position of the sub-bridge piers, the temperature rise and temperature cycling is the main factor that causes the top-to-side slope displacement of the pier. With the increase of bearing bias and pier height The radius of curvature of the line has little effect on the top displacement of pier; the difference of sliding friction coefficient caused by partial corrosion of bearing steel is the main reason that eventually leads to the gradual cumulative displacement of pier top.