跨度为15m的单层柱面网壳几何参数对杆件地震动应力峰值的影响

The Effect of the Geometric Parameters to the Peak of Earthquakes Dynamic Stress of the 15 m-span Single-layered Cylindrical Grid Shell

以跨度为15 m的单层柱面网壳为研究对象,利用El-Centro地震波,通过对其长跨比、矢跨比的改变,分析了单层柱面网壳斜杆和纵杆地震动应力峰值的变化规律。结果表明,斜杆地震动应力峰值与纵杆地震动应力峰值相比较大;随长跨比增大,斜杆和纵杆地震动应力峰值增大,但当长跨比大于2.6时,略为减小;矢跨比变化对斜杆和纵杆地震动应力峰值变化的影响规律受长跨比选取的影响。

The 15 m-span single-layered cylindrical grid shell is selected,EL-Centro is conducted,it is analyzed how the length-span ratio,rise-to-span ratio influence the peak of earthquake＇s dynamic stress of the single-layered cylindrical grid shell.The results show that oblique rod peak of earthquake,s dynamic stress is more than vertical rod peak of earthquake,s dynamic stress;the peak of earthquake,s dynamic stress increases with increasing in Length-span ratio,at the same time there would be a slight reduction when length-span ratio is more than 2.6.Rise-to-span ratio influences the variation of the peak of earthquake,s dynamic stress,which is related with the selection of length-span ratio.