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Shear capacity and failure behavior of DFRCC repaired RC beams at tensile region

机译：DFRCC修复的RC梁在抗拉区的抗剪承载力和破坏特性

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Many shear dominant structural members in existing concrete structures have been evaluated as below serviceable standard requiring strengthening and/or repair. In order to repair these aged reinforced concrete (RC) structures, a section replacement method of removal and replacement of old concrete and/or steel reinforcements of damaged sections with new concrete and/or steel reinforcements are commonly used. However, this repairing method is used without understanding the complicated structural behavior such as shear behavior of RC structures. Also, the materials commonly used for repairing are concrete and cement mortar. In order to implement the material superiority of newly developed cement based material and to complement the disadvantages of cement-based construction materials such as brittleness of failure, Ductile Fiber Reinforced Cementitious Composite (DFRCC), a high performance cementitious composite with superior strain capacity, is currently being used as a repair material. However, the composite behavior between old substrate and new repair material is not clearly understood at present. In order to effectively apply DFRCC as repairing material on RC structure, the interface, the weakest part in the repaired system where most failures occur, must be studied in depth. In this research, the composite behavior of a RC flexural member repaired using the superior tensile capacity of DFRCC on the tensile face of a RC specimen is studied. Two types of DFRCC repaired RC specimens are tested, one is without shear stirrups and the other is with shear stirrups. By comparing these two types of DFRCC repaired specimens, the failure mechanism and interface debonding behavior as well as repairing capacity can be effectively studied.
机译：现有混凝土结构中的许多剪力支配结构构件已评估为低于需要加强和/或修理的可用标准。为了修复这些老化的钢筋混凝土（RC）结构，通常使用一种断面替换方法，该方法是使用损坏的断面来替换旧的混凝土和/或钢筋，并用新的混凝土和/或钢筋来替换。但是，使用这种修复方法时并没有理解复杂的结构行为，例如RC结构的剪切行为。而且，通常用于修复的材料是混凝土和水泥砂浆。为了发挥新开发的水泥基材料的材料优势，并弥补水泥基建筑材料的脆性等缺点，韧性纤维增强水泥基复合材料（DFRCC）是一种具有优异应变能力的高性能水泥基复合材料，当前用作维修材料。但是，目前尚不清楚旧基材与新修补材料之间的复合性能。为了有效地将DFRCC用作RC结构的修复材料，必须深入研究发生故障最多的修复系统中最薄弱的界面。在这项研究中，研究了使用DFRCC优异的抗拉能力在RC试样的拉伸面上修复的RC挠性构件的复合行为。测试了两种类型的DFRCC修补的RC标本，一种不使用剪切箍筋，另一种使用剪切箍筋。通过比较这两种类型的DFRCC修复标本，可以有效地研究破坏机理和界面剥离性能以及修复能力。

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