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混凝土柱托换节点的梁柱新旧混凝土界面是托换节点受力的关键部位。为提高梁柱界面的承载能力,提出预应力托换节点,通过高强螺栓在梁柱新旧混凝土界面上施加预应力以提高界面的受力性能。进行了10个四面包裹式预应力托换节点及1个对比试件的试验研究,结果表明:托换节点界面承载力随预加应力的增大而增大,基本呈正线性相关;在托换节点的两个方向同时施加预应力将会使托换节点的受力更加合理,其承载力较预应力单方向施加的提高约20%;根据试验结果提出了预应力托换节点的界面承载力计算式,供工程设计参考。
Concrete column underpinning the new beam column beam interface is a key part of the force-bearing node. In order to improve the bearing capacity of the beam-column interface, a prestressed underpinning joint is proposed, and the prestressing force is applied to the new-old concrete interface of the beam-column by means of high-strength bolts to improve the force-bearing performance of the interface. The experimental study on 10 four-sided wrapped prestressed underpinning joints and one comparative specimen shows that the bearing capacity of the underpinning joints increases with the increase of pre-stress, which is basically positive linear correlation; The simultaneous application of prestress in both directions of the joint will make the stress of the underpinning node more reasonable, and the bearing capacity will be increased by about 20% compared with unidirectional prestressing. Based on the test results, the interface bearing capacity of the prestressed replacement joint Calculation formula for engineering design reference.