活性粉末混凝土柱抗震性能试验

Seismic performance of reactive powder concrete columns

摘要:

为了考察活性粉末混凝土柱类构件的抗震性能,开展了18根活性粉末混凝土柱的拟静力试验,研究了轴压比、纵筋配筋率、配箍率和钢纤维体积含量4个因素对活性粉末混凝土柱破坏形态、滞回特性、骨架曲线、刚度、承载力及延性的影响规律．研究表明:活性粉末混凝土柱的承载力随着轴压比的增大而提高,但其延性随着轴压比的增大有下降的趋势;试件柱的承载力及位移延性系数随着纵筋配筋率的增大而显著增大;配箍率的提高一定程度上改善了荷载达到峰值后阶段的滞回特性,骨架曲线的下降段变得较为平缓;钢纤维掺量的增加,改善了试件柱的破坏进程,一定程度上提高了试件柱的延性及耗能能力．

Abstract:

To explore the seismic performance of reactive powder concrete (RPC) column, the quasi-static test of 18 RPC columns are carried out. The factors affecting the column failure patterns, hysteretic characteristics, skeleton curves, rigidity, bearing capacity and ductility were analyzed in this paper, which included axial compression ratio, longitudinal reinforcement ratio, stirrup ratio and steel fiber volume content. The results show that, the bearing capacity of reinforced RPC columns increases, but the ductility decreases with the increase of axial compression ratio. The bearing capacity and displacement ductility coefficient of reinforced RPC columns significantly increases with the increase of longitudinal reinforcement. The stirrup ratio has large influence on the hysteretic behavior of reinforced RPC columns and the skeleton curve flattens out as load exceeds the peak point. The steel fiber volume content has large influence on fracture process of RPC columns, with the increase of steel fiber content, and the ductility of reinforced RPC columns can be improved to a certain extent.