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进行了6个足尺PC(预应力混凝土)平板-T形柱节点试件在竖直荷载作用下的冲切性能试验.其中,5个试件的平板中配有无粘结预应力筋,1个对比试件的平板中配普通钢筋.通过试验阐述了节点试件的破坏特征.结果表明:所有试件都产生弯曲冲切复合破坏特征;当接近极限荷载时,预应力筋的应力有较大幅度的增加,但未达到其极限强度;在保持一定的延性的条件下,平板中的预压应力可提高节点的冲切承载力和刚度.文中还根据试验结果给出了临界截面的形状和节点弯曲破坏的位置,最后采用美国ACI规范和我国规范所推荐的计算公式对上述节点的冲切承载力进行了验算.
Six full-scale PC (prestressed concrete) slab-T-shaped column joints were punched under vertical load, in which the unbonded prestressing tendons were placed in the five specimens, The test results show that all specimens have the characteristics of bending and punching composite failure. When the ultimate load is approached, the stress of prestressing tendons But not reach the ultimate strength.Under certain ductility conditions, the pre-stress in the plate can improve the punching bearing capacity and stiffness of the node.According to the experimental results, the critical section Shape and node bending damage. Finally, the punching bearing capacity of the above-mentioned joints was checked by the calculation formula recommended by ACI Code of the United States and China's Code.