Seismic behavior of flanged reinforced concrete shear walls with high‐strength stirrup under cyclic loading

Abstract

Summary Twelve half‐scale flanged reinforced concrete (RC) shear wall specimens with high‐strength stirrup were tested to failure under cyclic loading. The effects of axial load ratio, aspect ratio, and web confinement on seismic performances were critically examined. All specimens showed an expected flexural‐dominant behavior, with the crushing of the compressed concrete and the buckling of reinforcement at the boundary elements. The axial load ratio was found to have significant effects to the seismic behavior of the shear walls. Higher loading capacity and lower ductility capacity can be achieved with increases in the axial load ratio. The hysteretic curves of the walls were all unsymmetrical, especially in T‐shaped walls. The specimens showed higher strength and stiffness, but lower ductility capacity when the web was in compression. The use of high‐strength stirrups can effetely confine the compressed concrete and postpone bucking of longitudinal rebars in the free web boundary, thus preventing premature failure when web was in compression. The plastic deformation capacity of all the test specimens was all excellent, and the ultimate drift ratio of all specimens greatly exceeded the allowable inter‐story drift ratio value (1/120) of RC shear wall in accordance with the design provisions of Chinese GB50011‐2010 code.

Torsional behavior of hybrid fiber reinforced shear walls an experimental point of view

“…The researchers and specifications for the behavior of RC shear walls subjected to pure torsion show a rather poor level of knowledge related to the torsional behavior. Many researchers [15][16][17][18][19][20][21][22][23][24][25] have conducted to study on the effect of seismic performance of the RC shear walls. Nevertheless, many researchers do not have focused on the torsional behavior of the RC shear walls.…”

Experimental investigation of small-scale shear walls under lateral loads

“…Experimental studies on low-aspect ratio walls ranging from 1 to 2 were done by Farrar and Baker and Salonikios et al [1,2]. Various parameters were studied on shear walls as applied in axial load, concrete type, steel grade, steel arrangement, and shear wall cross-section but mostly on squat shear walls [3][4][5]. Liao et al and Salonikis et al showed that the shear walls tested that have steel bars in the same direction as the principal direction of applied stresses in this study have greater ductility than that of conventional shear walls [2,5].…”