【摘要】 为了进行建筑结构倒塌全过程的力学模拟,针对建筑结构倒塌数值模拟梁壳单元几何、材料、接触三重非线性且连续体向非连续体转化的动力计算问题,提出了显式有限元与离散元的统一模型"质点元方法",该方法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,较好地继承了有限元的单元技术、本构技术以及离散元的非连续体计算能力,具有效率优先、精度可调的特点。通过某框架剪力墙结构计算表明,质点元方法能够用于建筑结构倒塌的连续体与非连续体共存及转化的强非线性动力计算。更多还原

【Abstract】 In order to simulate the nonlinear dynamic process of building structure collapse,considering the coupled nonlinearity of geometrical,material and contact from continuum to non-continuum,a particle element method(PEM) was proposed to simulate the nonlinear dynamic process of building structure collapse.The PEM,which inherits the element and material techniques of the finite element method and non-continuum computational power of discrete element method,unifies the explicit finite element method(EFEM) and discrete element method(DEM) to the same computation framework by defining the generalized link model,constructing the conversion law of the link model and the contact collision algorithm.The PEM,which gives priority to efficiency while precision can be adjusted,can be used for strong nonlinear dynamic simulation of building structure collapse that continuum and non-continuum both exist.更多还原