含能材料2025，Vol.33Issue(7)：751-765,15.DOI:10.11943/CJEM2025066
混凝土非均质性对RC梁冲击响应尺度效应的影响机制
Influence Mechanism of Concrete Heterogeneity on Scaling Effect of RC Beam Impact Response
摘要
Abstract
Reinforced concrete structures are frequently subjected to impact loads during their service life,leading to complex dy-namic responses that are often difficult to predict.To systematically investigate the influence of concrete heterogeneity on the im-pact response and scaling effect of geometrically similar RC beams.Using a comparative analytical approach,three numerical models were established:a homogeneous RC beam(Homogeneity)and two heterogeneous RC beams(Heterogeneity-I and Heterogeneity-II).The displacement,impact force,and reaction force were compared.Furthermore,damage modes,deflection curves,and energy absorption characteristics were analyzed to explore the intrinsic mechanisms of scaling effect.The results in-dicate that the concrete heterogeneity is one of the factors contributing to the scaling effect in the displacement of geometrically similar RC beams,while its influence on impact force and reaction force is relatively minor.The intrinsic mechanism of the above-mentioned phenomenon may be the difference in damage modes due to heterogeneity,which enhances the local re-sponse of the RC beams with analysis of deflection curves and energy absorption.Additionally,within the scope of this study,higher impact velocities lead to more pronounced scaling effect in the displacement.These findings provide theoretical insights for impact-resistant design of concrete structures and for similitude analysis in scaled experimental studies.关键词
钢筋混凝土梁/非均质性/尺度效应/冲击荷载/损伤模式Key words
reinforced concrete beam/heterogeneity/scaling effect/impact load/damage model分类
建筑与水利引用本文复制引用
金浏,吴少雄,张仁波,李健,杜修力..混凝土非均质性对RC梁冲击响应尺度效应的影响机制[J].含能材料,2025,33(7):751-765,15.基金项目
国家自然科学基金(52308130) （52308130）
北京市自然科学基金(JQ22025) National Natural Science Foundation of China(No.52308130) （JQ22025）
Beijing Natural Science Foundation of China(No.JQ22025) （No.JQ22025）
