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为研究酸雨环境下箍筋约束混凝土(以下简称约束混凝土)的应力-应变关系,配置不同浓度的酸液,对配箍特征值分别为0.195,0.125的50个150mm×150mm×450mm钢筋混凝土棱柱体试件进行酸液周期浸泡侵蚀及轴压加载试验,研究了侵蚀程度、配箍特征值对混凝土峰值应力及峰值应变等力学性能的影响,得到约束混凝土的应力-应变全曲线.结果表明:酸雨环境下,约束混凝土的受压应力-应变全曲线呈扁平状;在配箍特征值相同的情况下,随着酸液浓度的增加,混凝土峰值应力呈线性降低,而峰值应变相应增大;在酸液浓度相同的情况下,混凝土峰值应力降低程度及峰值应变增大程度均随混凝土强度的增大而减小.
In order to study the stress-strain relationship of stirrup restrained concrete under acid rain conditions (hereinafter referred to as confined concrete), different concentrations of acid solution were set up, and 50 150mm × 150mm × 450mm RC columns with characteristic values of 0.195 and 0.125 The specimens were immersed in acid solution for cyclic immersion and axial compression tests to study the influence of the degree of erosion and the characteristic value of the stirrup on the mechanical properties such as peak stress and peak strain of concrete.Results show that the acid rain Under the same conditions, the peak stress of concrete decreases linearly and the peak strain increases correspondingly with the increase of acid concentration. In the case of the same hoop feature, the compressive stress-strain curve of the confined concrete is flat. Under the same acid concentration, the decrease of peak stress and the increase of peak strain of concrete decrease with the increase of concrete strength.