预加轴压比对后张拉无粘结预应力柱抗震性能的影响

EFFECT OF PRE AXIAL COMPRESSION RATIO ON SEISMIC BEHAVIOR OF POST TENSIONED UNBONDED PRESTRESSED CONCRETE COLUMNS

为获得加入预应力筋后RC柱的抗震性能,本文设计了2根加入后张无粘结预应力筋的RC柱和1根普通的RC柱,对三根柱子进行了低周反复荷载试验,获得试件的滞回曲线,探究预加轴压比对后张拉无粘结预应力柱残余变形及耗能性能的影响及规律。结果表明,在普通混凝土柱中加入无粘结预应力筋可有效地减小柱的残余变形,预加轴压比的增加会导致其滞回耗能性能变差,残余变形减小,自复位能力提高。

In order to obtain the aseismic performance of RC column after adding prestressing tendons, 2 RC columns and 1 common RC columns with post tensioned unbonded tendons were designed, and three columns were tested under low cyclic loading. The hysteresis curves of the specimens were obtained, and the residual deformation and consumption of prestressing unbonded prestressed columns were investigated. The effects and rules of performance. The results show that the residual deformation of the columns can be effectively reduced by adding unbonded prestressed tendons to the ordinary concrete columns. The increase of the pre axial compression ratio will lead to the lag energy dissipation performance, the decrease of residual deformation and the increase of self reset capacity.