The nonlinear behaviour of integral infilled frames, in which the infill and the frame are bonded or connected together, is studied both experimentally and analytically. In the theoretical study, a finite-element method is used and the nonlinearities of the materials and the structural interface are taken into account. The entire range of load-deflection behaviour is investigated. Besides stiffness and strength, the stress distribution, crack patterns and collapse modes are also studied. Particular attention is directed towards the stress redistribution before collapse. The effects of the connectors are investigated in relation to the stiffness and strength of the infilled frames. Theoretical stiffness and strength predictions are compared with experimental results. © 1984.

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