The cracking development processes of the three specimens were similar. The inclined cracks of specimens S-2 and S-3 approximately formed 60 and 45° respectively relative to the horizontal direction. The outermost longitudinal reinforcing bars at the wall boundary on the tension sides of S-2 and S-3 yielded at the lateral displacements of 2.4 and 3.6 mm corresponding to tensile strains of 1.502 × 10−3 and 1.489 × 10−3 respectively. The yielding of the chord members of embedded truss of specimens S-2 and S-3 occurred prior to the lateral displacements of 5.4 and 6.6 mm corresponding to tensile strains of 1.608 × 10−3 and 3.863 × 10−3 respectively. The web braces of embedded truss of S-2 and S-3 yielded immediately after the yielding of chord members. The average cracking loads of specimen S-2 and S-3 were 230 kN and 195 kN respectively, which were 35.3% and 14.7% greater than that of specimen S-1. The spalling off and crushing of concrete at the bottom region of specimen S-3 occurred the latest among the three specimens, while specimen S-2 occurred the earliest, indicating the different post-yield deformation capacities among specimens. At the termination of testing, the web concrete crushing of S-1 appeared to be the worst as compared with specimens S-2 and S-3 (Fig. 6). The main test results are summarized in Table 4.