Connection is divides into rigid connection, semi-rigid connection, ideal pin connection, and is animportant and complicated content in the steel frame design. The reliability and effectivity ofconnections has much direct influence on the behavior of whole steel frame. Especially after theunexpected numerous brittle connection failures happened in the 1994 Northridge earthquake, manyscholars have been attaching great importance to the observed connection problems in project circle,witch is one of the hot research subjects in recent years. This paper draws lessons from the researchapproaches of some scholars on the basis of existing research results. T -type connections ofbeam-to-column are systematical analyzed and researched by using the study methods of experimentstudy, theoretic analysis, nonlinear FIRM.
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