The paper presents the issue of unbraced and semi‐rigid steel frames stability with special attention paid to the problem of determining buckling length Lcr of columns in these frames.
The paper discusses ways of buckling length determination in frames columns with the use of selected, simplified procedure, as well as numerical method of stability analysis. The presented procedures and the analysis methods were used in calculations of certain steel frames. On the basis of presented results, it has been shown that in many practical cases, the simplified procedure of buckling length determination can give error‐prone results.
The issues presented in the paper are important from the practical point of view, and therefore, they should be taken into account in the design process of such frames.
The paper presents an influence problem of the rotational flexibility of supporting joints on steel frames behaviour. A substantial part of the paper is devoted to, neglected in the engineering practice, issue of rotational flexibility of the foundationsubgrade system. This problem was analyzed on the assumption that the foundation in the form of a rectangular rigid punch rests on a homogeneous medium of finite depth. Suitable analyses of the foundation were done using several subgrade models: Winkler's model, elastic half-space (in the classic approach) and with the use of the boundary element method, as well as HS model (hardening soil) by application of the finite elements method. The phenomenon of rotational flexibility of footings resting on a soil subgrade was analyzed within the linear range. It was shown, that the practical assessment of rotational stiffness of footings resting on subgrade can also be performed by using simple methods (e.g., based on the Winkler's model).The presented evaluation methods of the whole flexibility supported joints were used in the static and stability analyses of the certain steel frame. The presented results confirmed a significant influence of the flexibility of the supporting joints on the steel frames behaviour.
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