三维地震作用下应用FPB单层球面网壳抗震性能

为准确确定三维地震作用下应用摩擦摆支座(FPB)单层球面网壳结构的减震效果,在精细化建模基础上,分析了摩擦摆支座的隔震机理,并对摩擦摆支座单层球面网壳结构从静力和动力两个方面进行分析.静力荷载作用下,从结构内力、变形和稳定性3个方面分析摩擦摆支座对网壳结构静力力学性能的影响;三维地震作用下,应用动力时程分析方法分析了地震动强度以及摩擦摆支座参数对单层球面网壳抗震性能的影响规律.结果表明:静力作用下,加强外环杆件能有效改善摩擦摆支座对网壳结构的不利影响;三维地震作用下,地震动强度越大,摩擦摆支座隔震性能越好;摩擦摆支座的最优摩擦系数随着地震动强度的增大而增加;摩擦摆支座曲率半径越大网壳结构的抗震性能越好.

Seismic performance for single-layer reticulated shells with FPB under 3D ground motion

To accurately determine the vibration reduction effect of single-layer reticulated shells with friction pendulum bearings (FPB), based on the refined finite element models, the isolation mechanism of FPB was given, and single-layer reticulated shells with FPB were analyzed from two aspects of static and dynamic. Structures were analyzed in three aspects including the internal force, deformation and stability under static loading, and were also researched through dynamic time-history analysis under 3-D earthquake waves. The impact of ground motion intensities and parameters of FPB on the seismic performance of single-layer latticed shell was discussed. The analysis results indicate that the static mechanics performance of a single-layer reticulated shell with FPBs can be improved by strengthening the outer ring bars. Under 3-D earthquakes, the bigger the ground motion intensity, the better isolation performance of FPB will be. The optimal friction coefficient of FPB increased with the increase of ground motion intensity. The bigger friction pendulum bearing curvature radius is, the better seismic performance of reticulated shell structure will be.