钢筋混凝土板的冲切承载力

Punching Shear Capacity of Reinforced Concrete Slab

依据现有钢筋混凝土板冲切性能试验结果,分析了影响混凝土板冲切破坏及其承载力的主要因素.结果表明,混凝土强度、板的有效高度、冲跨比、荷载作用位置、荷载作用的面积、作用面积的形状及有无抗冲切钢筋、板的配筋率、板两边长度比等对钢筋混凝土板的冲切承载力具有不同程度的影响,提出了采用高强混凝土、钢纤维高强混凝土以及纤维增强聚合物筋以提高钢筋混凝土板开裂荷载、极限冲切承载力和改善钢筋混凝土板冲切延性,以及加强理论分析研究的建议.

Based on the current research results on the punching shear capacity of reinforced concrete slabst,he main factors effected punching failure mode and punching shear capacity of reinforced concrete slabs are ana-lyzed.The results show that concrete strengthe,ffective heightr,atio of punching-spanc,haracters of loading-ac-tiona,nd the longitudinal bars characteristic have the effect with different degree.Finallyt,he proposal enhancing craking loadingl,imit punching shear capacity and improving punching ductility of concrete slabs with high strength concretes,teel fiber reinforced concrete or fiber reinforced polymer rebars.At the same timet,he theory analysis should be considered.