带有楔形轨道的滑移支座力学性能数值模拟研究

针对结构隔震装置在较大的倾覆力作用下抗拉能力不足的问题，提出了一种带有楔形分离式轨道的新型滑移支座。新支座能够承受上部结构传递的荷载以及适应较大水平位移，同时利用楔形轨道与楔形滑块之间的相互作用提供抗拉能力。采用通用有限元程序ABAQUS建立了支座的三维实体有限元模型，对其抗压、抗拉、压剪和拉剪力学性能进行数值模拟研究，同时考虑了楔形角度的改变对支座力学性能的影响。通过分析表明：在竖向新支座具有较好的抗压和抗拉能力，抗拉性能受楔形角度的影响较大，角度大于60°时，支座的抗拉能力随着角度的减小不断提升；而当角度减小到60°时，楔形滑块与上部连接部分出现薄弱点，导致支座的抗拉能力开始降低。在压剪与拉剪的作用下，支座水平向的滞回曲线比较饱满，具有较好的水平向摩擦耗能能力且能够适应较大的水平位移。

Numerical simulation on the mechanical properties of sliding bearing with wedge track

In order to solvethe problem of insufficient tensile capacity of the structural isolation device under the action of large overturning forces,a new type of sliding bearing with wedge-shaped separated track was proposed. The new bearing can with stand the loads transmitted by the upper structure as well as accommodate large horizontal displacements,while providing tensile capacity by using the interaction between the wedge-shaped track and the wedge-shaped slider. The three-dimensional solid finite element model of the bearing was established by using the general finite element program ABAQUS,and the mechanical properties of its compressive,tensile,compression shear and tensile shear were studied by numerical simulation,atthesametime, the influence of the change of wedge angle on the mechanical properties of the bearing was also considered. The analysis shows that the new bearing has good compressive and tensile capacities in vertical direction,the tensile performance is greatly influenced by the wedge angle.When the angle is greater than 60°,the tensile capacity of the bearing is continuously increased with the decrease of the angle;however,when the angle is reduced to 60°,the weak point appears in the connection part between the wedge slider and the upper part,which leads to the tensile capacity of the bearing begins to decrease. Under the action of compression shear and tension shear,the horizontal hysteresis curve of the bearing is relatively full,with good horizontal frictional energy dissipation capacity and can adapt to large horizontal displacement.