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为准确计算钢筋混凝土中振捣棒的有效作用范围，提出一种新的基于新拌混凝土流变理论的振捣棒作用半径的预测模型，在受振混凝土满足假塑性流体特征和钢筋网中流动等效为多孔介质渗流的假定下，推导了振捣棒在钢筋混凝土中的作用半径表达式，并结合试验结果对表达式中的经验参数进行了经验拟合。模型计算结果与试验结果对比分析，发现除棒体振动强度较小的个别工况外，作用半径预测模型总体预测精度较高，但考虑到施工现场混凝土浇筑所用振捣棒振动强度大，因此作用半径预测模型可有效指导现场振捣作业和量化评价钢筋布置方案对棒体振捣作用范围的影响。
Abstract：To accurately calculate the effective range of vibration rods in reinforced concrete, this study proposes a new prediction model for the effective radius of vibration rods based on the rheological theory of fresh concrete. Under the assumptions that the vibrated concrete exhibits pseudoplastic fluid characteristics and the flow in the steel mesh is equivalent to seepage through porous media, an expression for the effective radius of the vibration rod in reinforced concrete is derived. The empirical parameters in the expression are then empirically fitted in conjunction with experimental results. By comparing the model calculations with experimental values, it shows that, except for a few cases with low vibration intensity of the rod, the overall prediction accuracy of the effective radius prediction model is higher. Considering that the vibration intensity of the rods used in concrete pouring at construction sites is generally high, the model can effectively guide on-site compaction operations and quantitatively evaluate the impact of steel bar layout schemes on the vibration range of the rod.
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基本信息:
DOI：10.20040/j.cnki.1000-7709.2025.20242072
中图分类号:TU645
引用信息:
[1]边策,李金明,田正宏等.钢筋混凝土中的振捣棒作用半径预测[J].水电能源科学,2025,43(09):87-91.DOI:10.20040/j.cnki.1000-7709.2025.20242072.
基金信息:
国家重点研发计划(2022YFC3005605); 国家自然科学基金项目(51879094)