SMA三维隔震复合支座单层柱面网壳结构的地震响应

Seismic analysis of single-layer cylindrical lattice shell structure with SMA 3D base isolator

大跨空间结构具有空间跨度大,结构整体刚度大、受力合理、耗材少、重量轻等优点,在世界各地应用前景非常广阔。但在强震作用下,此种结构破坏严重,经济损失惨重。震害经验与理论研究表明地震动是一种复杂的多维运动,只考虑单分量水平地震作用是不够的,还应考虑竖向地震分量对整体结构的影响。在作者研制的SMA-叠层橡胶支座的基础上,针对竖向刚度大、竖向隔震效果不明显的问题,研制一种在上部串联加入碟形弹簧的新型三维隔震支座,并建立一典型的单层柱面网壳结构模型,在输入不同峰值地震动情况下,通过时程反应分析可见,SMA三维隔震支座下结构位移、加速度峰值与普通橡胶支座对比明显降低,时程曲线趋于平缓,典型的杆件轴力也有明显降低,说明了SMA三维隔震复合支座隔震效果更好。

Long-span structure has a prospect of being widely used all over the world nowadays,which has the merit of long span,large rigidity as a whole,reasonable pressure,small amount of the consumption of materials,light in weight and etc.But in the strong earthquake,this structure will suffer great damage and economic losses.According to the experiences of the earthquake damage and theoretical researches,the earthquake motion is a kind of complex multi-dimensional movement.It is not enough if only the single component of the horizontal seismic effect is considered.Meanwhile,it should be considered that the vertical seismic component has an effect on the whole structure.On the basement of the SMA 3D base isolator,there is a new SMA 3D base isolator with papilionaceous spring on the top in order to solve such problems as the vertical rigidity is large and vertical isolating effect is not obvious.And a classical single-layer cylindrical lattice shell structure is built.In the different conditions of the earthquake ground motion components,the displacement,and the acceleration of the new SMA 3D base isolator are apparently reduced compared with the old one and the time history tends to smooth and the classical axial forces are reduced too,which shows this SMA 3D base isolator is better than the laminated rubber bearing.