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SEISMIC BEHAVIOR TEST OF FIBER-REINFORCED RECYCLED CONCRETE PREFABRICATED COMPOSITE WALLS
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摘要: 为推进再生混凝土类材料的研究和应用，考察纤维增强再生混凝土预制复合墙板的受力性能，设计制作两片纤维增强再生混凝土装配式墙体、一个普通混凝土装配式墙体试件进行拟静力试验对比研究。研究纤维增强再生混凝土类墙体的破坏现象、破坏机制与滞回特性等，探讨不同预制墙板材料对墙体整体刚度退化、强度退化、变形曲线、耗能能力及残余变形率的影响及关键抗震性能指标的影响规律。研究表明：纤维增强再生混凝土试件呈现明显的弯剪破坏形态，刚度退化平缓，与普通混凝土试件退化规律一致，不同框格材料墙体在屈服点附近刚度略有差异；各墙体强度退化规律类似，峰值荷载后纤维增强再生混凝土墙体的强度退化更平稳；对比普通混凝土试件，两个再生混凝土试件峰值荷载分别下降2.1%、2.6%，延性系数分别提高28.0%、27.4%；通过合理设计可应用于12层以下装配式复合墙结构体系。Abstract: To promote the research and application of recycled concrete and study the mechanical properties of fiber-reinforced recycled concrete(FRC) precast composite wallboard, two FRC prefabricated composite wall specimens and one ordinary concrete prefabricated composite wall specimen were designed and tested. The experiment aimed to study the failure phenomenon, failure mechanism and hysteresis characteristics of FRC prefabricated composite walls, and to explore the influence of different precast wallboard materials on stiffness degradation, strength degradation, deformation curve, energy dissipation capacity and residual deformation rate of the wall. The test results showed that FRC prefabricated composite walls showed an obvious bending-shear failure mode, and the stiffness degradation was gentle, which was consistent with the degradation law of ordinary concrete specimen; different materials mainly affected the stiffness on the yield point, and had almost no influence on the later stiffness; the strength degradation law of the three specimens was similar, while the strength degradation of FRC specimens was more stable than that of the ordinary concrete specimen after peak load. Compared with the ordinary concrete specimen, the peak load of two FRC specimens decreased by 2.1% and 2.6% respectively, and the ductility coefficient increased by 28.0% and 27.4% respectively. The FEC walls showed a good comprehensive performance and could be applied to 12-storey prefabricated composite wall structure based on effective design.
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