Abstract：Pseudo-dynamic test was carried out to study the seismic performance of a steel frame with T steel semi-rigid connections under two kinds of earthquake peak acceleration. Peak strain, displacement, load variation and load-displacement hysteresis curve for the frame were analyzed and contrasted under two kinds of loading conditions with vertical loads and without vertical loads, so as to investigate the effect of vertical load on the seismic behavior of a steel frame with semi-rigid connections. The experimental results showed that T steel semi-rigid steel frame had better deformation capacity and ductility performance, and that the hysteretic performance was good at the strong aseismic ability. It is also revealed that the dynamic response increased with the increase of earthquake loading, and that vertical loading had a bigger effect on the displacement response and had little effect on both the strain and interlayer load

Keyword：semi-rigid connection;steel frame;aseismic performance;vertical load;pseudo dynamic test;