玻璃钢布约束混凝土圆柱尺寸效应的研究

Study of Size Effect of GFRP Cloth Confined Concrete

为研究混凝土强度对GFRP布约束混凝土圆柱尺寸效应的影响规律,用强度为C30和C40混凝土分别制作了3根GFRP布约束钢筋混凝土圆柱的试件进行试验及有限元分析,探究不同混凝土强度对轴心受压下GFRP布约束钢筋混凝土圆柱力学性能的影响规律.结果表明:混凝土强度越高,GFRP布约束钢筋混凝土柱的极限抗压强度越高,且试件尺寸越大,极限抗压强度的提高程度越大,但混凝土强度较高时,极限抗压强度提高幅度减小,试件延性变差,更容易发生脆性破坏,建议使用混凝土等级为C40.

In order to study the influence of concrete strength on the size effect of concrete columns confined by the glass fiber-reinforced plastic（GFRP）, three specimens of GFRP restrained reinforced concrete columns are fabricated by C30 and C40 concrete respectively. The effects of different concrete strengths on the axial effect of GFRP Cladding on the mechanical properties of reinforced concrete cylinders subjected to pressures. The results show that the ultimate compressive strength of GFRP reinforced concrete columns is higher with the increase of concrete strength; and the ultimate compressive strength increases with the increase of specimen size. But when the concrete strength is high, the ultimate compressive strength increase the rate of decrease; the ductility deterioration, more prone to brittle damage. Finally, it is suggested to use concrete grade C40.