| 摘要: |
| 采用等强配合比优化设计来制备橡胶掺量0%~20.0%、钢纤维掺量0%~1.5%的12组钢纤维橡胶混凝土（SFR-RuC）试件，并且通过单轴循环受压应力-应变全曲线试验分析其循环受压力学性能.结果表明：配合比优化设计后，在橡胶掺量为20.0%时可以得到与普通C60混凝土基本等强的SFR-RuC；与普通混凝土、橡胶混凝土及钢纤维混凝土相比，SFR-RuC的循环受压力学性能更优，破坏呈明显延性特征，延性和韧性更高，滞回耗能能力更强，塑性应变累积和刚度退化更缓慢；综合考虑橡胶及钢纤维掺量的影响，在试验数据基础上提出的SFR-RuC单轴循环受压应力-应变关系模型，可以为SFR-RuC结构的设计分析提供一定的理论基础. |
| 关键词: 橡胶混凝土 钢纤维 等强度设计 循环受压应力-应变关系 破坏机理 |
| DOI：10.3969/j.issn.1007-9629.2022.08.004 |
| 分类号:TU528.31;TU528.572 |
| 基金项目:国家自然科学基金资助项目（51678406， 51878447， 51378340， 51708314） |
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| Stress-Strain Relations of Steel Fiber Reinforced Rubberized Concrete under Uniaxial Cyclic Compression |
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ZHAO Qiuhong1,2, DONG Shuo1, ZHU Han1,2, YU Yong3
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1.School of Civil Engineering， Tianjin University， Tianjin 300072， China;2.Key Laboratory of Coastal Civil Structure and Safety of Ministry of Education， Tianjin University， Tianjin 300350， China;3.School of Civil Engineering， Qingdao University of Technology， Qingdao 266033， China
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| Abstract: |
| Twelve groups of steel fiber reinforced rubberized concrete （SFR-RuC） with crumb rubber content ranging from 0%-20.0% and steel fiber content ranging from 0%-1.5% were prepared by optimizing the mixture design at equal strength， and uniaxial cyclic compression tests were performed to investigate their cyclic mechanical behavior. The results show that SFR-RuC with 20.0% rubber particles can be obtained with the similar strength to normal concrete C60 by optimizing the mixture design. Compared with specimens of normal concrete， rubber concrete and steel fiber reinforced concrete， the SFR-RuC specimens show good mechanical properties under uniaxial cyclic compression， and the failure mode of SFR-RuC specimens is ductile. The ductility， toughness and dissipated energy of SFR-RuC specimens are obviously enhanced， while the plastic strain accumulation and stiffness degradation become slower. Based on experimental data and comprehensively considering the influence of crumb rubber and steel fibers， a constitutive model is proposed to generalize the stress-strain response of SFR-RuC under uniaxial cyclic compression， which can provide some theoretical background for the design and analysis of SFR-RuC structure. |
| Key words: rubber concrete steel fiber equal strength design cyclic stress-strain relation failure mechanism |
