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为了研究预应力碳纤维(CFRP)布加固混凝土方形截面短柱轴心受压力学性能,根据配筋率的不同设计了3组共计12根混凝土方形截面短柱,每组包括3根预应力CFRP布加固的混凝土柱和1根普通混凝土柱。通过静载试验获得了各试件受压极限承载力、位移和预应力CFRP布应力增量等试验数据,得到了荷载作用下试件变形曲线及破坏形态,分析了预应力CFRP布应力水平和纵筋配筋率对混凝土方形截面短柱加固后的力学性能的影响。研究结果表明:采用预应力CFRP布约束混凝土柱一方面能够限制混凝土横向变形,使柱中混凝土从加固时刻起即受到环向应力,提高了混凝土极限压应变,从而显著提高柱的极限承载力,承载力提高幅度在60%以上;另一方面,由于受压柱的延性与截面配筋率有关,加固柱配筋率较低时,延性较好;反之则延性较差。
In order to study the axial compressive mechanical properties of square columns reinforced with prestressed carbon fiber reinforced concrete (CFRP), 12 pairs of concrete square cross-section columns were designed according to the different reinforcement ratio. Each group consisted of 3 prestressed CFRP sheets Reinforced concrete columns and a normal concrete column. Through the static load test, the test data of the ultimate compressive load, displacement and prestressed CFRP cloth stress increment of each specimen were obtained. The deformation curve and failure mode of the specimen under load were obtained. The stress level of the CFRP cloth prestressed and Effect of Longitudinal Rib Reinforcement on Mechanical Properties of Square Concrete Short Column Strengthened by. The results show that the prestressed CFRP sheet restrained concrete column can limit the lateral deformation of concrete on the one hand and the concrete in the column from the moment of reinforcement is subjected to the hoop stress and improve the ultimate compressive strain of concrete so as to significantly increase the ultimate bearing capacity of the column, On the other hand, due to the ductility of the column under compression and the ratio of section reinforcement, the ductility is better when the reinforcement ratio of the reinforcement column is lower; on the other hand, the ductility is poor.