ASEISMIC EXPERIMENTAL STUDY ON MID-FRAME JOINTS OF SEMI-RIGID BEAM-COLUMN CONNECTION

The column loading was adopted instead of the traditional symmetric beam-end loading to carry out the low cyclic reversed loading test on the mid-frame joint of T-section steel connection，which was more in accordance with the practical loading features． The test results showed that the maximum stress occurred at the junction between the flange and web of T-member，where the plastic hinge appeared firstly; during the loading process，the column flange and the beam flange were both at the elastic stage，yet the shear strain of the joint area turned into the yield strain． Meanwhile，the hysteretic curve and the skeleton curve testified the preferable ductility and energy dissipation of the joint．