A method has been developed directed towards the analysis of multistory buildings beyond the classic limit and also considering geometrical non-linearities. The plastic zones are concentrated at the ends of the members and a singie stiffness matrix has been developed which makes it possible to describe the behaviour of the member in the presence of plastic hinges at one or the other or at both ends. The solutions are obtained using an incremental-iterative method and a special algorithm which takes into account the interaction between the member end forces during the elasto-plastic phase, guarantees the equilibrium of each element ad at the same time compels the stress point to respect the yield condition. The method has been codified in a computer program even for the study of very large structures. Some examples have been given to demonstrate the validity of the method and the reliability of the code.
Inelastic analysis of steel frames for multistory buildings
GAMBAROTTA, LUIGI
1985-01-01
Abstract
A method has been developed directed towards the analysis of multistory buildings beyond the classic limit and also considering geometrical non-linearities. The plastic zones are concentrated at the ends of the members and a singie stiffness matrix has been developed which makes it possible to describe the behaviour of the member in the presence of plastic hinges at one or the other or at both ends. The solutions are obtained using an incremental-iterative method and a special algorithm which takes into account the interaction between the member end forces during the elasto-plastic phase, guarantees the equilibrium of each element ad at the same time compels the stress point to respect the yield condition. The method has been codified in a computer program even for the study of very large structures. Some examples have been given to demonstrate the validity of the method and the reliability of the code.
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