冲击荷载下单层球面网壳动力响应分析与试验研究

Numerical analysis and experimental study on the dynamic response of single-layer reticulated shell under impact

为分析带下部支承结构的Kiewitt-6型单层球面网壳在冲击荷载下动力响应,在ANSYS/LS-DYNA中建立钢管柱支承的单层球面网壳数值分析模型,据冲击响应特点,总结四种响应模式,研究冲击能量、冲击位置、环梁刚度对上部网壳动力响应影响。进行钢管柱支承的单层球壳模型冲击试验,测量、分析结构的动应力、动位移及加速度,研究冲击柱破坏模式。结果表明,四种响应模式以冲击柱破坏模式(轻微损伤、局部凹陷、压弯破坏、剪切破坏)为典型特征;除响应模式4,网壳动力响应随冲击能量增大而增大;柱中为最不利冲击位置;环梁刚度增大,网壳动力响应减小;有限元分析结果与实测结果吻合较好,验证数值计算方法的正确性。

In order to analyze the dynamic response mode of Kiewitt-6 single-layer reticulated shell with substructure under impact,a model of shell with steel pipe column for numerical analysis was established by using the ANSYS /LS-DYNA program.Four dynamic response modes were put forward according to the features of dynamic responses.The influences of the impact energy,impact location,and stiffness of ring beams were studied.The impact test on the single-layer reticulated shell model with steel pipe columns was conducted.The dynamic stress,dynamic displacement and acceleration were measured and analyzed,and the damage patterns of impacted columns were studied. The results show that response modes are typically characterized by the damage patterns of impacted columns （slight damage,local dent,press-bend failure and shear failure）.The dynamic response of the reticulated shell increases with the increase of impact energy with the exception of the response mode 4.The most unfavorable impact position is the central part of columns.The dynamic response of reticulated shell decreases with the increase of stiffness of ring beams.The numerical model was also proved to be reasonable by comparing the theoretical and experimental results.