Abstract
In this paper, a newly external diaphragm connection detail is proposed for steel beam to concrete-filled square steel tube column moment connection. This connection detail has divided diaphragms to reduce welding for simplifying the steelwork for conventional external diaphragm connection detail. The local elasto-plastic behavior for the connection detail is same as that for the conventional connection detail from tensile tests. An analytical model is proposed for predicting the load-displacement relation of such local connections. This model is developed by superposing the strength of diaphragm on the load-displacement relations for a tube flange. The tube flange is modeled as a grid beam with a tetra-linear load-displacement relation. The analytical method is found to agree approximately with experimental results up to large deformations.
