Abstract Impact force and structural response of reinforced concrete (RC) beams under drop weight impact have been intensively studied and reported in the literature. The prediction of the peak impact force has been well investigated while the study of the overall impact force profile governing the structural response is limited. The impact force parameters acting on a structure including the peak impact force, plateau force, and impact duration all affect the structural responses. This study investigates the impact force profiles from drop weight impact on RC beams. The effects of global stiffness (by changing the beam span and boundary condition) on the impact force profile are numerically studied by using LS-DYNA. A two-degree-of-freedom (2DOF) analytical model is developed for RC beams under drop weight impact by using fiber beam section analysis method to predict the impact force. The developed 2DOF analytical model is validated by drop weight impact test results. With the validated analytical model, a simplified model of impact force profile is then proposed by determining six characteristic points, which are expressed by empirical equations fitted by the analytical parametric study results. The simplified impact force profile predicted by the empirical equations shows a good agreement with the test data.

中文翻译：

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落锤冲击下RC梁冲击力分布的解析与数值研究

摘要 钢筋混凝土（RC）梁在落锤冲击下的冲击力和结构响应已在文献中得到深入研究和报道。峰值冲击力的预测已经得到很好的研究，而对控制结构响应的整体冲击力分布的研究是有限的。作用在结构上的冲击力参数包括峰值冲击力、平台力和冲击持续时间都会影响结构响应。本研究调查了落锤对 RC 梁的冲击力分布。使用 LS-DYNA 数值研究了整体刚度（通过改变梁跨度和边界条件）对冲击力剖面的影响。利用纤维梁截面分析法预测冲击力，建立了落锤冲击下RC梁的二自由度(2DOF)分析模型。开发的 2DOF 分析模型通过落锤冲击测试结果进行验证。使用经过验证的分析模型，然后通过确定六个特征点来提出冲击力分布的简化模型，这些特征点由分析参数研究结果拟合的经验方程表示。由经验方程预测的简化冲击力曲线与测试数据显示出良好的一致性。然后通过确定六个特征点来提出冲击力分布的简化模型，这些特征点由分析参数研究结果拟合的经验方程表示。由经验方程预测的简化冲击力曲线与测试数据显示出良好的一致性。然后通过确定六个特征点来提出冲击力分布的简化模型，这些特征点由分析参数研究结果拟合的经验方程表示。由经验方程预测的简化冲击力曲线与测试数据显示出良好的一致性。