【摘要】 针对建筑结构倒塌过程的梁壳单元几何、材料、接触三重非线性且连续介质向非连续介质转化的动力计算问题,提出了能够考虑多重非线性用于连续介质与非连续介质共同作用且动态转化计算的质点元方法。该方法以质点运动学为基础,建模过程与有限元一致,通过定义广义连接模型、构造连接模型转化法则和建立接触碰撞算法,将显式有限元与离散元统一于相同的计算框架之下,具备有限元连续介质阶段的计算精度和离散元非连续介质阶段的计算能力,能够用于建筑结构倒塌等强非线性的动力计算。更多还原

【Abstract】 Considering the coupled nonlinearity of geometrical,material and contact,a particle element method(PEM) was proposed to simulate the nonlinear dynamics process of building structure collapse from continuum to noncontinuum.Based on the theory of particle dynamics,this method unifies the explicit finite element method and the discrete element method to the same computation framework by defining the generalized link modal,constructing the conversion law of the link modal and creating the contact collision algorithm.The particle element method,which has the computation accuracy of finite element method during the continuum phase and the computation capability of discrete element method during the noncontinuum phase,could be used for strong nonlinear dynamics simulation of building structure collapse.更多还原