Damage mechanism and structural property for high-strength-steel partial frame without diaphragm

When rigid moment resisting frames with high tension steel are subjected to the seismic force, the fracture at the ends of beam may occur and it causes the strength of frames decreased. On the other hands, the semi-rigid moment resisting frames without diaphragm with high tension steel can absorb the seismic energy at the beam-to-column connections due to its plate deformation. This study performs cycle loading experiments to high tension steel part frames, and compares the initial rigidity and the yield strength of part frames without diaphragm with that of part frames with diaphragm. In addition, these experimental results are compared with the approximation of the reference.