Abstract
A method for analysing the behaviour of flexibly-connected plane steel frames is presented. Two types of elements are used in the analysis procedure: the beam-column (frame) element and the connection element. The beam-column element formulation is based on an updated Lagrangian approach. Allowance for the coupling effect of axial force and bending moments, as well as for the formation of plastic hinges in the member, is made for this beam-column element. The nonlinear behaviour of the connection is modelled by an exponential function. Both loading and unloading responses of the connections are taken into consideration in the formulation. The monotonic load-deflection response of frames with flexible connections is traced using an incremental load control Newton-Raphson iterative technique. Based on sub-assemblage and frame analyses, it is concluded that connection flexibility has an important influence on frame behaviour.
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