三维减震摩擦摆支座力学性能试验研究

EXPERIMENTAL STUDY ON THE MECHANICAL PROPERTIES OF A THREE-DIMENSIONAL ISOLATION FRICTION PENDULUM BEARING

  • 摘要: 为同时应对大型动力设备产生的竖向扰动和工业建筑在地震中的水平受力需求,本文设计了一种可实现竖向减振与水平隔震的三维减震摩擦摆支座,其竖向与水平方向性能实现了自然解耦。该支座由环形弹簧、碟形弹簧和双凹型摩擦摆组成,基于其结构特性与运动机理,建立了相应的力学模型。通过竖向压缩试验和水平压剪试验,系统分析了支座的力学性能。试验结果表明:该支座竖向滞回曲线呈“三角形”形态,具有较高的承载力与良好的耗能能力;水平方向滞回曲线呈“平行四边形”,与传统摩擦摆支座性能一致,展现出良好的耗能效果和抗疲劳性能。

     

    Abstract: To consider the mechanical vibrations induced by the vertical disturbance forces of large dynamic equipment and the horizontal seismic effects on industrial building structures, designed was a three-dimensional isolation friction pendulum bearing capable of simultaneously achieving a vertical vibration reduction and horizontal seismic isolation. The vertical and horizontal performances of the bearing can be naturally decoupled. The bearing is composed of ring springs, of disc springs and, of a double-concave friction pendulum. Based on its structural characteristics and kinematic mechanism, the corresponding mechanical model was derived. The mechanical properties of the bearing were analyzed through both vertical compression tests and horizontal shear tests. The study results showed that the vertical hysteresis curve of the developed bearing exhibited a “triangular” shape, indicating the high load-bearing capacity and an excellent energy dissipation performance. In the horizontal direction, its performance was consistent with that of conventional friction pendulum bearings, exhibiting a “parallelogram” shape hysteresis curve that demonstrated a good energy dissipation and a fatigue resistance.

     

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