2.1 Specimen Design

2.1.1 The components of the Specimen

The specimen in the test mainly consists of four parts: The main steel sheet, the edge stiffening, connecting plate and T-plate. Figure 1 shows the schematic diagram of specimen structure, in which friction-type connection of high strength bolt is used between the main steel sheet and T-plate, T-plate and loading beam. The test used 2 specimen of full scale: specimen SPSWS 1 and specimen SPSWS 2.

2.1.2 Specimen Size and Stiffening Method

1) Specimen size: The thickness of specimen SPSWS 1 and specimen SPSWS 2 is 14 mm and 12 mm respectively; According to the specification of Baosteel for the residential house demonstration project of steel frames in Wuhan, the overall size of the main steel sheet is: 1950 mm wide, 2260 mm high. With reference to the test data of Japan, we determined the slit parameters and detail size according to the results from finite element analysis (FEA). Refer to the Figure 2 and Table 1.

2) The stiffening method of the two specimens is identical: The flange stiffening of the main steel sheet uses rectangular cold-formed steel tube. The size of their section is 100 x 100 mm, their thickness are 10 mm. Rectangular cold-formed steel tube is welded to the main steel sheet with alternate open weld on both sides.

Where: H - shear wall height, B - shear wall width, t - shear wall thickness, m - number of slit layer, n - number of slit, Hu - wall height at upper end, Hd - wall height at lower end, Hm - wall height between slits, L - slit height, b - column width, d - slit width, Hr - ribbed stiffener height.

2.2 Loading Device

The test was performed at structure laboratory of Tongji University, and a large scale multiple loading machines is used in the test for loading. The equipment has maximum horizontal thrust force of 3000 kN, and maximum tension force of 1500 kN. No vertical load is applied during the test. The test apparatus consists of upper beam (loading beam), four bar linkage mechanism and lower beam (ground beam). The upper and lower end of steel of the specimen is connected with upper and lower beam with high-tensile bolts, in which four bar linkage mechanism is used to restrict the in-plane rotation of specimen plane. At the places corresponding to the both ends of loading beam, two pairs of out-of-plane supporting frames are provided respectively so as to constraint the lateral displacement which may appear in the loading beam. Refer to Figure 3 for Test Apparatus, and Figure 4 for Geometrical Size.

2.3 Loading System

The hybrid control loading of force and displacement is used for three specimens. Force control is used in the early stage of loading. Switch to displacement control after yield (the control displacement δ here is the horizontal relative displacement at the upper and lower edge of the specimen, i.e. lateral displacement of the specimen). According to circumstances, each stage had 2~3 cycles, till the specimen reached the ultimate load-bearing capacity or reached the relatively large inter-lamination displacement.

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