4.2. Dynamic responses of T-joint
Due to accident of the data logger systemduring the tests, the test
results of Specimen J14b were not captured. After the drop hammer
hit the top end of brace, the stress wave travels in the joint. As the
transverse stiffness of chord is much less smaller than the axial
stiffness of brace, the impact wave makes the top surface of chord
near the intersection between chord and brace dent firstly, then the
steel around the intersection between chord and brace start to yield