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 浙江大学学报(工学版)  2020, Vol. 54 Issue (6): 1058-1067    DOI: 10.3785/j.issn.1008-973X.2020.06.002
 土木工程
FRP筋混凝土板冲切承载力计算方法

1. 浙江工业大学 土木工程学院，浙江 杭州 310023
2. 同济大学 土木工程学院，上海 2000922
3. 浙江大学城市学院 工程学院，浙江 杭州 310015
Computational method of punching-shear capacity of concrete slabs reinforced with FRP bars
Xing-lang FAN1(),Sheng-jie GU1,Jia-fei JIANG2,Xi WU3
1. College of Civil Engineering, Zhejiang University of Technology, Hangzhou 310023, China
2. College of Civil Engineering, Tongji University, Shanghai 200092, China
3. College of Engineering, Zhejiang University City College, Hangzhou 310015, China
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Abstract:

A punching-shear capacity model for concrete slabs reinforced with fiber-reinforced polymer (FRP) bars was proposed based on critical shear crack theory. The moment-curvature relationship of FRP concrete slabs was established by a sectional analysis method, in which the tensile stress-strain relationship of concrete was incorporated with the tension stiffening effect. The demanding curve of FRP concrete slabs was determined by a simplified deformation of concrete slabs, the moment-curvature relationship of FRP concrete slabs, and the equilibrium equations of slabs. The validity of the model was verified with experimental results collected from the literature. At the same time, the accuracy of existing punching-shear models of FRP concrete slabs was compared and evaluated. The parametric analysis results indicate that the nominal punching shear stress in slabs increases but the critical rotation angle of slabs decreases with the increase of FRP reinforcement ratio and effective depth. As the strength of concrete and the loading area increase, the nominal punching shear stress in slabs decreases but the critical rotation angle of slabs increases. The effect of slab thickness and reinforcing ratio on the durability of concrete slabs should be considered in the design of slabs.

Key words: critical shear crack theory (CSCT)    strip method    fiber-reinforced polymer (FRP) bars    concrete slabs    punching shear capacity

 CLC: TU 375.2

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#### 引用本文:

Xing-lang FAN,Sheng-jie GU,Jia-fei JIANG,Xi WU. Computational method of punching-shear capacity of concrete slabs reinforced with FRP bars. Journal of ZheJiang University (Engineering Science), 2020, 54(6): 1058-1067.

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 图 1  FRP筋混凝土板的冲切力-转角关系 图 2  临界剪切裂缝的开展示意图 图 3  扇形单元板中FRP筋、混凝土的内力及合力分布情况 图 4  FRP筋混凝土轴对称板的径向、切向曲率假定分布 图 5  FRP筋混凝土板冲切承载力计算流程图 图 6  FRP筋混凝土受弯构件弯矩-曲率关系计算流程图 图 7  冲切承载力理论值与试验值的比较 表 A1  FRP筋混凝土板试件几何及材料参数 图 8  不同参数对FRP筋混凝土板的影响
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