关键词: 建筑板柱结构, 冲切破坏, 承载力, 冲垮比, 纵向配筋率, 混凝土强度

Abstract:

In order to ensure the safety of the building slab-column structure， the slab-column structure specimen plate was made with steel bars， cement， etc. as raw materials， and the punching failure test was carried out. According to the calculation formula of the joint bearing capacity， the joint bearing capacity under different plate thicknesses， concrete strength， longitudinal reinforcement ratio， and crush ratio was calculated， and the influence of each factor change on the joint bearing capacity was analyzed. The experimental results show that when the longitudinal load of the specimen plate increases to the maximum bearing capacity， instantaneous brittle failure occurs， and warpage occurs at all displacement measuring points. The smaller the value， the greater the punching shear bearing capacity； greatly increasing the thickness of the specimen plate， the reinforcement ratio of reinforcement， the concrete strength， and reducing the punching collapse ratio can improve the punching shear bearing capacity of the specimen plate. When the reinforcement ratio increases from 0.6% to 1.4%， the maximum punching shear bearing capacity of the node can be increased by 29.2%. When the punching ratio is 7 and the reinforcement ratio is 0.6%， the increase of the concrete strength is small， and the increase in the punching shear bearing capacity of the node is small. To a certain extent， the bearing capacity of the building slab-column structure is improved.

Key words: building slab column structure, punching failure, bearing capacity, washout ratio, longitudinal reinforcement ratio, concrete strength