摘要
为提高钢筋混凝土板-L形型钢混凝土柱节点的冲切承载力和延性,提出并研究了一种新型抗冲切元件(倒T形钢)。通过3个节点的冲切破坏试验,研究了柱帽、板厚和倒T形钢对节点冲切性能的影响。试验结果表明,配置倒T形钢可显著提升节点的抗冲切承载力和延性,但由于腹板-混凝土界面黏结滑移引发的锚固失效,其残余承载力会出现二次下降。此外,利用ABAQUS有限元软件进行参数研究。参数分析结果表明:倒T形钢腹板厚度的增加对提高节点的极限承载力贡献较小,但其腹板长度的增加对节点残余承载力的影响十分显著,特别是当钢筋混凝土板厚与倒T形钢腹板长度之比(h/l)<0.75时,节点的破坏模式会由脆性冲切破坏转变为延性弯冲破坏。最后,在试验和数值研究的基础上建立了配置倒T形钢的钢筋混凝土板-L形型钢混凝土柱节点抗冲切承载力计算模型,并验证了模型的计算精度。
To enhance the punching shear capacity and ductility of reinforced concrete slab-L-shaped steel reinforced concrete column connections,a novel anti-punching shear element(inverted T-shaped steel)was proposed and investigated.Punching shear tests on three different connection types were conducted to examine the influence of the column cap,slab thickness,and inverted T-shaped steel on the punching shear performance of the connection.The test results demonstrate that the inverted T-shaped steel configuration significantly enhances the punching shear capacity and ductility of the joint.However,due to bond-slip failure at the web-concrete interface,its residual bearing capacity exhibits secondary degradation.Furthermore,a parametric study was performed using ABAQUS finite element software.The analysis reveals that increasing the thickness of the web of the inverted T-shaped steel has a minimal impact on the ultimate bearing capacity of the connection.However,enlarging the web length of the inverted T-shaped steel significantly affects the residual bearing capacity of the connection,particularly when the ratio of slab thickness to the length of the inverted T-shaped steel web is less than 0.75.In such cases,the failure mode of the connection shifts from brittle punching shear failure to ductile bending-punching failure.Finally,an analysis model for the punching shear capacity of reinforced concrete slab-L-shaped steel reinforced concrete column connections with inverted T-shaped steel was developed based on both experimental and numerical investigations,and the accuracy of the model was verified.
作者
张炜
薛建阳
徐金俊
赵飞
张翀
ZHANG Wei;XUE Jianyang;XU Jinjun;ZHAO Fei;ZHANG Chong(School of Energy and Architecture,Xihang University,Xi’an 710077,China;School of Civil Engineering,Xi’an University of Architecture&Technology,Xi’an 710055,China;Key Lab of Structural Engineering and Earthquake Resistance,Ministry of Education,Xi’an University of Architecture&Technology,Xi’an 710055,China;College of Civil Engineering,Nanjing University of Technology,Nanjing 211816,China)
出处
《振动与冲击》
北大核心
2025年第24期159-170,199,共13页
Journal of Vibration and Shock
基金
陕西省自然科学基金(2025JC-YBQN-610)
西安航空学院校级博士基金(2023KY0209)。
关键词
板柱结构
L形型钢混凝土柱
倒T形钢
冲切破坏
抗冲切元件
slab-column structures
L-shaped steel reinforced concrete column
inverted T-shaped steel
punching shear failure
anti-punching shear element
