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首先介绍了求解冲击问题的解析法、有限元法的算法基础、适用于求解强非线性动力问题的有限元解法,以及计算冲击荷载响应的通用有限元软件ANSYS/LS-DYNA。为验证软件求解功能及相关参数设置的正确性,分别用解析法与有限元软件求解同一简单模型,二者结果吻合。随后在ANSYS/LS-DYNA软件中建立了60m跨度K8型单层球面网壳冲击模型。在上述基础上,对135个K8型网壳算例进行了分析,研究表明:网壳竖向变形和主要杆件受力随冲击质量与速度的增加而增大,当质量与速度增加到一定值后,二者均不再变化。而且当冲击质量较小时,网壳塑性发展可以由冲击动量初步判定,冲击质量较大时,则与冲击速度之间有明显相关性。在一次冲击网壳破坏情况下,冲击持时随冲击速度的增大而减少。
Firstly, the analytic method to solve the impact problem, the algorithm foundation of the finite element method, the finite element method to solve the strong nonlinear dynamic problem and the general finite element software ANSYS / LS-DYNA to calculate the impact load are introduced. In order to verify the correctness of software solution function and related parameters setting, the same simple model was solved by analytic method and finite element software, respectively. Subsequently, a 60m span K8 single-layer spherical reticulated shell impact model was established in ANSYS / LS-DYNA software. Based on the above analysis, 135 K8 reticulated shell cases are analyzed. The results show that the vertical deformation of the reticulated shell and the force of the main rod increases with the increase of the impact mass and velocity. When the mass and velocity increase to a certain extent After the value, both no longer change. Moreover, when the impact mass is small, the plasticity of the shell can be initially determined by the impact momentum, and when the impact mass is large, there is a significant correlation with the impact velocity. In a case of impact shell damage, the impact of impact with the impact of the increase of speed and decrease.