摘要
低剪跨比RC剪力墙广泛应用于高层建筑底部、转换层结构以及特殊防护等工程中,但其潜在的脆性剪切破坏显著威胁结构抗震安全。同时,针对剪跨比λ≤1.0的剪力墙抗震性能的研究较为有限。因此,本工作基于ABAQUS建立数值模型,通过与试验结果对比验证模型可靠性后,分析了边缘约束构件配箍率、纵筋率以及轴压比对剪跨比为1.0和0.5的钢筋混凝土剪力墙抗震性能的影响。结果表明,低剪跨比剪力墙中,提高边缘约束构件配箍率对承载力提升有限,但可增强变形能力,且剪跨比越小,变形能力提升越显著;提高边缘约束构件纵筋率对承载力的增幅高于配箍率,但对变形能力的改善作用弱于配箍率,且剪跨比越小,纵筋对承载力的贡献越弱、对变形能力的提升越强;轴压比增大可提高剪力墙的初始刚度和承载力,且承载力增幅随轴压比增加放缓,但会导致极限位移显著下降,加剧脆性破坏。剪跨比越小,结构对轴压比变化的敏感性越高。
Low shear span ratio reinforced concrete shear walls are widely used in engineering applications such as the bottoms of high-rise buildings,transfer floor structures,and special protection structures.However,their potential brittle shear failure significantly threatens the seismic safety of structures.Meanwhile,research on the seismic performance of shear walls with a shear span ratio λ≤1.0 remains limited.Therefore,this study establishes a numerical model based on ABAQUS.After verifying the model's reliability through comparison with experimental results,the effects of stirrup ratio,longitudinal reinforcement ratio in edge constraint components,and axial compression ratio on the seismic performance of reinforced concrete shear walls with shear span ratios of 1.0 and 0.5 are analyzed.The results show that in low shear span ratio shear walls,increasing the stirrup ratio in edge constraint components has limited enhancement on bearing capacity but significantly improves deformation capacity,and the smaller the shear span ratio,the more pronounced the improvement in deformation capacity.Increasing the longitudinal reinforcement ratio in edge constraint components leads to a higher increase in bearing capacity than the stirrup ratio but a weaker improvement in deformation capacity.Moreover,the smaller the shear span ratio,the weaker the contribution of longitudinal reinforcement to bearing capacity and the stronger its enhancement on deformation capacity.An increase in axial compression ratio improves the initial stiffness and bearing capacity of shear walls,with the growth rate of bearing capacity slowing down as the axial compression ratio increases,but it also causes a significant reduction in ultimate displacement and aggravates brittle failure.The smaller the shear span ratio,the higher the sensitivity of the structure to changes in axial compression ratio.
作者
周婷婷
彭超
何勇
刘宇航
杨晓豪
ZHOU Tingting;PENG Chao;HE Yong;LIU Yuhang;YANG Xiaohao(Faculty of Civil Engineering and Mechanics,Kunming University of Science and Technology,Kunming 650500,China;Qujing Bureau of Housing and Urban-Rural Development,Qujing 655099,Yunnan,China;Jianyang Municipal Gardens Management Center,Chengdu 641499,China)
出处
《材料导报》
北大核心
2025年第S2期89-93,共5页
Materials Reports
基金
云南省地震科技创新团队(CXTD202401)。
关键词
低剪跨比
钢筋混凝土剪力墙
抗震性能
数值模拟
low shear span ratio
reinforced concrete shear walls
seismic behavior
numerical simulation
