华南理工大学学报（自然科学版）2025，Vol.53Issue(12)：82-93,12.DOI:10.12141/j.issn.1000-565X.250066
无腹筋钢筋混凝土梁的剪切传力机制分析
Analysis of Shear Force Transfer Mechanism of Reinforced Concrete Beams Without Stirrups
摘要
Abstract
To investigate the variation in shear force transfer mechanisms of reinforced concrete(RC)beams with-out stirrups,9 rectangular-section and 27 T-section RC beams without stirrups were designed,fabricated,and tested.Displacements and strain data were collected using digital image correlation(DIC),displacement transdu-cers,and strain gauges.Kinematic images of critical shear cracks were plotted,and the contributions of four shear transfer mechanisms—aggregate interlock,dowel action,residual tensile stress across cracks,and shear resistance of the uncracked compression zone—were quantified throughout the loading process.The evolution of these mecha-nisms during loading was analyzed.The results indicate that the number,development,and height of shear cracks exhibit a complex coupling effect on the four shear force transfer mechanisms;aggregate interlock generally reaches its maximum contribution at approximately 0.9 Pu(where Pu is the peak load),and its calculated shear resistance varies little with the shear-span ratio;however,its proportional contribution decreases as the shear-span ratio de-creases;dowel action remains relatively stable throughout loading,yet its relative contribution diminishes as the overall shear capacity increases.Residual tensile stresses across cracks contribute primarily in the early loading stage and diminish to zero at peak load due to full crack development.The shear capacity provided by the uncracked com-pression zone is influenced by multiple factors,most notably the shear-span ratio—the shear capacity in beams with small shear-span ratios can be more than twice that in beams with large shear-span ratios.At peak load,aggregate inter-lock is the dominant shear force transfer mechanism in beams with larger shear-span ratios.However,as the shear-span ra-tio decreases,the contribution of the uncompressed concrete zone increases rapidly and becomes the predominant mechanism.关键词
无腹筋钢筋混凝土梁/剪切破坏/骨料咬合作用/销栓作用/裂缝残余应力/未开裂受压区Key words
reinforced concrete beams without stirrups/shear failure/aggregate interlock/dowel action/residual tensile stress across cracks/uncracked compression zone分类
建筑与水利引用本文复制引用
付重阳,熊二刚,李思锋,刘丰玮,于佳仝..无腹筋钢筋混凝土梁的剪切传力机制分析[J].华南理工大学学报（自然科学版）,2025,53(12):82-93,12.基金项目
陕西省自然科学基础研究计划项目(2025JC-YBMS-390) （2025JC-YBMS-390）
未来城市建设与管理创新联合研究中心揭榜挂帅基金项目(2024WHZ0225)Supported by the Natural Science Basic Research Plan of Shaanxi Province(2025JC-YBMS-390) （2024WHZ0225）
