织物增强混凝土约束混凝土柱轴压力学性能试验研究
doi: 10.13204/j.gyjz201510016
EXPERIMENTAL STUDY ON MECHANICAL PROPERTY OF CONCRETE COLUMNS CONFINED BY TRC UNDER UNIAXIAL COMPRESSION
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摘要: 为研究织物增强混凝土(TRC)约束混凝土柱的轴压性能和TRC的约束机理,以配网率、截面尺寸和混凝土强度为主要变化参数设计了24个圆形截面TRC约束混凝土柱和8个素混凝土对比柱的轴心抗压试验,分析试件的受力过程和破坏形态,研究试件的应力-应变曲线,以及配网率、截面尺寸和混凝土强度对其承载性能的影响。试验结果表明:由于TRC的约束作用,提高了构件的强度和变形能力;TRC约束混凝土柱的破坏形态呈腰鼓状剪压破坏;TRC约束混凝土柱承载力随着配网率的增大而增大;增大构件截面面积会减弱TRC的约束效果;TRC对低强度混凝土的约束能力较强。最后提出了TRC约束混凝土强度计算式,计算结果与试验结果吻合较好。Abstract: To study the mechanical property and constraint mechanism of concrete columns confined by TRC under uniaxial compression,24 concrete columns confined by TRC and 8 unstrengthened concrete columns were designed based on textile ratio,section dimension and strength of concrete,and axial compressive tests were carried out. Based on the test results,stress process and failure mode of strengthened members were studied,stress-strain relationship of strengthened members was researched,effect of textile ratio,section dimension and concrete strength on ultimate strength of strengthened members was also evaluated. The results showed that the strength and deformability of the strengthened members increased,and the strengthened members showed drum-shaped shear damage. With the increasing of textile ratio,the confining effect of TRC on the concrete increased. With the increasing of section dimension,the confining effect of TRC on the concrete decreased. The confining effect of TRC on low strength concrete was stronger. The formulas of concrete columns confined by TRC were proposed. The calculated results agreed well with test results.
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