钢纤维混凝土板柱节点抗冲切承载力研究进展

Research progress in punching capacity of steel fiber reinforced concrete slab-column connection

钢筋混凝土结构板柱节点发生的冲切破坏属于没有预兆就可能发生的脆性破坏,一个节点的破坏可能会导致其他节点荷载的重分布,进而引发结构连续性倒塌,造成难以估量的后果。研究表明,钢纤维混凝土具有良好的抗裂性、抗剪性、抗冲击性、抗疲劳性、抗磨损性、韧性以及耐久性,在板柱节点处采用钢纤维混凝土可有效提高抗冲切能力,进而提高结构的整体稳定性。论述归纳了钢纤维混凝土(SFRC)板柱节点抗冲切性能的理论计算方法及典型理论预测模型,分析了现有模型存在的问题,可为工程应用和进一步研究提供借鉴参考。

The punching failure of the slab-column joints of reinforced concrete structures is brittle failure that may occur without warning.The failure of one joint may cause the redistribution of the load of other joints,which will lead to the collapse of structural continuity,resulting in incalculable consequences.Studies have shown that steel fiber concrete has good crack resistance,shear resistance,impact resistance,fatigue resistance,abrasion resistance,toughness and durability.The use of steel fiber concrete at the slab-column connections can effectively improve the punching resistance,thereby improving the overall stability of the structure.It summarizes the theoretical calculation methods and typical theoretical prediction models of the punching shear resistance of steel fiber reinforced concrete(SFRC)slab-column connections,and analyzes the existing problems of the existing models,which can provide references for engineering applications and further research.