Specimens from J1 to J4 were reinforced with basalt fiber directly to the destruction of test. The test phenomena were similar. Taking J1 for example, the failure process was discussed as follows. When the horizontal load reached 30kN, it cracked and sounded brittle at the weak parts of colloid. Then it was controlled by the displacement. When the displacement of column cap reached 24mm, the sheet sounded brittle in the core area and the cracks appeared at the bottom of plate along with the beams; when it reached 36mm, the sheet sounded brittle densely and violently in the core area and cracks cut through the plate; when it reached 60mm, the cracks appeared and parts of sheets tore at the junction of beam bottom and column; when it reached 96mm, parts of the sheets plumped up and divorced from the concrete at the top of beams and parts of the sheets broke at the bottom of beam and on the side of column; when it reached 108mm, it sounded severe and torsion cracks appeared on the side of beam; when it reached 120mm, the concrete crisped and broke off severely in the core area and the test ended. The concrete at the top of column destructed and the beam got away from the joint after test. The failure mode was flexural failure of beam tip. (Fig 2)When the displacement reached 36mm, the plate cracked. The number of cracks increased as the displacement increased. The facts above showed that the contribution of the
plate to the capacity of structure could not be ignored. Joint constrained by plate in tension increased when steel bar was fully utilized and came into the hardening stage.