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为研究织物增强混凝土与再生保温混凝土界面的黏结性能,设计了3组6种不同界面黏结推出试件,分析不同处理方式下推出件的荷载-位移曲线及试件的破坏形态。试验结果表明:预留沟槽推出试件对阻止界面滑移和剥离影响效果明显,在极限荷载时,预制纤维编织网增强混凝土(TRC)板肋被剪断,试件整体破坏形式呈脆性破坏;带纤维增强复材(FRP)剪力连接件剪切构件承载能力相对较好,荷载-位移曲线下降段较为平缓,试验过程中产生多条裂缝,沿着剪切面呈延性破坏,整个试验过程并未发生FRP连接件脆断、界面剥离现象;本试验合理的推出件设计和加载方案避免了对刚性模量较低夹芯层进行直接加载导致位移-荷载曲线不符合实际的试验要求。
In order to study the bond behavior of the interface between the fabric reinforced concrete and the recycled concrete, three groups of six kinds of bonded interface samples were designed to analyze the load-displacement curves and the failure modes of the specimens. The test results show that the effect of preventing the interface from slipping and peel off is obvious when the groove is reserved. When the ultimate load is applied, the rib of the prestressed fiber reinforced plastic (TRC) slab is cut off, and the overall failure mode of the test piece is brittle. The load-bearing capacity of shear members with fiber-reinforced composite (FRP) shear connectors is relatively good, the descending section of load-displacement curve is relatively flat, multiple cracks are generated during the test, and ductile damage along the shear surface occurs. FRP connector brittle fracture and interface delamination did not happen. The reasonable design and loading scheme of this test piece to avoid the direct loading on the lower rigid modulus sandwich layer resulted in the displacement-load curve not meeting the actual test requirements.