An efficient and accurate beam element for performing explicit dynamic analysis of reinforced concrete beam elements was built using the absolute nodal coordinate formulation (ANCF). Such a formulation is useful for performing dynamic analysis under large strains and displacement with sudden load changes, such as during impact loading or for progressive collapse analysis. Compared with traditional nodal position formulations, ANCF uses position vector gradients to describe the rotation of the body and strain state, thereby avoiding the need for interpolating non-vectoral rotation parameters. The fiber element method was applied to calculate element stiffness from section deformations by subdividing beam elements into uniaxial fibers. The combined fiber element beam-column model with ANCF was validated by traditional co-rotational analysis and the quadrature element method (QEM), and thus may be used in general nonlinear dynamic analysis.

使用绝对节点坐标公式（ANCF）构建了用于执行钢筋混凝土梁单元显式动力分析的高效，准确的梁单元。这样的公式可用于在大应变和具有突然载荷变化的位移下进行动态分析，例如在冲击载荷期间或进行渐进式塌陷分析。与传统的节点位置公式相比，ANCF使用位置矢量梯度来描述物体的旋转和应变状态，从而避免了对非矢量旋转参数的内插。通过将梁单元细分为单轴纤维，应用了纤维单元法来根据截面变形计算单元刚度。