Abstract
This paper describes structural behavior of H-beam to RHS-column connection without diaphragms. The connection is reinforced by increasing thickness of column wall and horizontal haunch of beam flange, in order to assure the required stiffness and strength of the connection. Cyclic loading tests of cruciform sub-assemblage frame were carried out to investigate the stiffness and strength of the non-diaphragm connection. The formulae to estimate the yield strength and ultimate strength of the non-diaphragm connection are developed, based on yield line theory. The formulae give reasonable agreement with test results. The sub-assemblage frame with the non-diaphragm connection has the adequate stiffiness, strength and deformation capacity.
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