锚筋式埋件节点拉拔试验及有限元分析

PULL-OUT TEST AND FINITE ELEMENT ANALYSIS OF ANCHORAGE-EMBEDDED PARTS

锚筋式埋件节点在索支承幕墙中应用广泛,且节点承受较大拉力。为了解拉索节点中锚筋式埋件的实际力学性能,制作了3个单拉索节点试件和2个三拉索节点试件,并对试件进行受拉承载力试验。结果表明:采用锚固长度大于30倍钢筋直径且端部加强的构造时,锚筋式埋件节点中不会出现混凝土与锚筋的黏结滑移破坏,仅出现锚筋的拉断;在三拉索节点中,边索受荷不会影响中索的承载力。另外,针对单拉索节点进行了有限元模拟。对比两者的结果可知,有限元分析所得的单拉索节点荷载-位移曲线与试验所得曲线能够较好地吻合,并且两种曲线的屈服荷载与极限荷载误差均在6%以内。

The connections of anchorage-embedded parts have been widely used in cable-supported curtain walls, which bear large tensile forces. In order to understand the actual mechanical properties of anchorage-embedded parts in connection of cables, 3 specimens of anchorage-embedded parts with a single tensional cable and 2 specimens of anchorage-embedded parts with three tensional cables were fabricated, and the tests of tensile bearing capacity for specimens were performed. The results showed that: when the anchorage length was longer than 30 times the diameter of the steel bar and the end was reinforced, the bond slip failure between the concrete and the anchorage parts would not occur, but only the anchorage parts would break. In the connections, the loads in the side cable would not impact on the bearing capacity of the middle cable. In addition, a single cable connection was simulated by FEM. Comparing the two results, it showed that the load-displacement curve of the anchorage-embedded parts with a single tensional cable obtained by FEM was in good agreement with the curve obtained from tests, and the error of the yield load and the ultimate load all less 6%.