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针对结构用橡胶混凝土应保证与普通混凝土等强,而此类橡胶混凝土单轴受压全曲线试验研究有限,尚无较成熟单轴受压本构模型的情况,分别进行了三组粒径1-2mm,掺量0-100kg·m~(-3)的橡胶混凝土立方体试块单轴受压试验,以及棱柱体试块受压应力-应变全曲线试验。结果表明:通过综合采用氢氧化钠(Na OH)碱溶液处理橡胶颗粒以及配合比优化设计的方法,可以精确控制橡胶混凝土与混凝土等强,且峰值应变及极限应变明显增加,试块破坏过程温和缓慢,破坏时完整性较好。同时,现有的普通橡胶混凝土单轴受压本构模型不适用于此类结构用橡胶混凝土,而混凝土单轴受压Carreira-Chu本构模型虽与试验曲线吻合尚可,但其对橡胶混凝土的适用条件有待考证。最后,通过曲线拟合试验数据,得到以过镇海模型为基础的结构用橡胶混凝土本构模型参数的建议取值,以用于此类结构构件的分析与设计。
For structural rubber concrete should be guaranteed with ordinary concrete and other strong, but this kind of rubber concrete uniaxial compression full curve test research is limited, there is no more mature uniaxial compression constitutive model, respectively, three groups of particle size 1 -2mm, uniaxial compression test of rubber concrete cubes with dosage of 0-100kg · m ~ (-3), and stress-strain full curve test of prismatic test pieces. The results show that the rubber particles can be precisely controlled by mixing sodium hydroxide (NaOH) alkali solution and the optimized design of mixture ratio. The peak strain and ultimate strain increase obviously. The failure process of the test pieces is mild Slow, good integrity when damaged. At the same time, the existing uniaxial compression constitutive model of ordinary rubber concrete is not suitable for such structures with concrete, while the Carreira-Chu constitutive model of uniaxial compression of concrete is in good agreement with the experimental curve, The applicable conditions to be verified. Finally, the proposed values of the parameters of the constitutive model of rubber-reinforced concrete structures based on the over-Zhenhai model are obtained through the curve fitting test data, so as to be used for the analysis and design of such structural components.