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为了数值模拟建筑结构倒塌过程中的梁柱构件,建立了一个具有大位移大转动非线性动力计算能力的显式梁元。该梁元基于显式有限元单元理论,采用更新拉格朗日列式,考虑了转动的不可交换性,选用共旋(Co-Rotational)方法分离单元刚体位移和变形位移,通过应力更新算法来考虑材料的非线性。算例表明该梁元力学性能良好,具有一定的工程应用价值。
In order to numerically simulate the beam-column component during the collapse of building structure, an explicit beam element with large displacement and large rotational nonlinear dynamic calculation capability was established. Based on the explicit finite element theory, the beam element is updated by Lagrangian, considering the non-exchangeability of rotation. The Co-Rotational method is used to separate the rigid body displacement and deformation displacement. Through the stress update algorithm Consider the material’s nonlinearity. The example shows that the beam element has good mechanical properties and certain engineering application value.