关键词: 摩擦摆支座;梁式渡槽;滑动曲面半径;滑动面摩擦系数;敏感性分析;滇中引水工程;

Abstract: Taking a water conveyance beam aqueduct in Central Yunnan Water Diversion Project as the engineering background, and taking the aqueducts with highest pier and the lowest pier as the research objects, the influences of the radius of sliding surface of friction pendulum bearing and friction coefficient on the horizontal displacement and bending moment of pier bottom under the longitudinal and transverse designed earthquake action are calculated and analyzed. The results show that under horizontal earthquake action, the horizontal displacement of bearing decreases with the increase of sliding friction coefficient μ when the radius of sliding surface R is fixed. The influence is most obvious when μ value changes between 0.02 and 0.04. When μ value approaches 0.1, support displacement tends to be consistent. Under the longitudinal earthquake action, the moment at the bottom of pier increases with the increase of μ. When R is 2 m, the transverse bending moment of pier bottom increases with the increase of μ; when R value changes in 3~10 m, the transverse bending moment of pier bottom decreases first and then increases with the increase of μ, and there is an obvious inflection point. The results have important meanings to design and manufacture of friction pendulum bearing.

Key words: friction pendulum bearing; beam-type aqueduct; radius of sliding surface; friction coefficient of sliding surface; sensitivity analysis