BEHAVIOR OF ANNEALED WIRE FIBER COUPLING BEAM ON SHEAR WALL UNDER CYCLIC LOADS

Coupling beam is a link beam that connects two shear walls as the key factor that determines the behavior of the shear wall. A number of previous studies on coupling beam have concluded that several factors cause failure or collapse in the coupling beam, among others due to large shear forces, ductility, reinforcement problems that cause poor energy dissipation. To increase shear strength, ductility and energy dissipation in the coupling beam is to use annealed wire fiber. The purpose of this study is to discuss the behavior of coupling beam in the aspects of shear strength, ductility using annealed wire fibers under cyclic loads. In this study, three coupling beam specimens were made, namely the coupling beam of normal concrete (CB-1), and the coupling beam of annealed wire fiber concrete (CBF-1 and CBF-2). Annealed wire fiber composition used after optimization of several variations in fiber composition is 0.75% by volume with a ratio of length to fiber L/D of 60 for fiber length of 48 mm. Cyclic testing refers to SNI 7834: 2013 testing standards with displacement control systems. From the research results obtained for the shear strength of the coupling beam increased 58% with the addition of annealed wire fiber. The effectiveness of annealed wire fiber is seen in ductility, especially in coupling beam with simplified reinforcement that is increased by 53%.