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Received Aug 17, 2017; Accepted Oct 31, 2017
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1. Introduction
In recent years, due to high industrialized level, good quality, convenient installation, energy conservation, and environment protection, the precast concrete structure is widely used. In particular, the prefabricated shear wall structure with large rigidity and great bearing capacity is the first choice for high-rise housings. In this regard, China has made policies to promote the development of the prefabricated shear wall structure [1], and many institutes and universities have carried out the relevant research [2, 3]; meanwhile, they cooperate with the national housing industrialization bases [4, 5] and applies the structure in some estate development projects as demonstration [6, 7]. What is more, the implementing subjects continue rise, for example, the prefabricated concrete shear wall structure system of Zhongnan Group [8]. For the prefabricated shear wall structure, the horizontal connection in the structure is the key to ensure structural integrity and seismic performance [9], and for this purpose, the authors invent a new horizontal connection [10] whose bearing capacity has been studied; however, the ductility which unbonded reinforcement can improve has not been studied.
To date, addressing the ductility calculation of different shear wall structures, many engineers or scholars have made contributions. For the conventional cast-in-situ shear wall, Si et al. [11] proposed displacement ductility calculation method considering the effect of axial compression ratio, shear span ratio, confined end-zone, and stirrup eigenvalue. Park et al. [12] deduced the crack curvature, yield curvature, peak curvature, and ultimate curvature of flexure-dominated shear wall with concentrated end-zone reinforcements and uniformly web reinforcements along the cross section. For high-performance concrete shear wall, Liang et al. [13] deduced the crack-bending moment and curvature, yield-bending moment and curvature, peak-bending moment and curvature, and ultimate-bending moment and curvature. For prefabricated shear wall, Chen [14] deduced the formula of crack-bending moment and curvature, yield-bending moment and curvature, peak-bending moment and curvature, and ultimate-bending moment and curvature.
Therefore, here, firstly, for the newly horizontal connection, considering the effect of confined end-zone and unbonded reinforcement, yield curvature and ultimate curvature are calculated, which prepares for...