Abstract
The evaluation of second-order effects of steel framed structures can provide different analysis results than using linear analysis methods. In various structural engineering literature were distinguished different methods of analysis: taking or without taking into account second-order effects. It depends on the sensitivity to the horizontal actions. The slenderer the structure, the more sensitive it is to horizontal actions. Using nonlinear methods, the sensitivity of steel frame to second-order impact is considered. This paper shows the importance of evaluations of the second-order effects in behaviour of steel frame structures. Performed investigations reveal the influence of the rotational stiffness of the joints to the behaviour of whole framed structure. Calculation results show that decreased flexibility of the semi-rigid joints increase sensitivity of the framed structure to the second-order effects and vice versa. The identified interdependence between the sensitivity to the second-order effects and the flexibility of the semi-rigid joints highlights the importance of evaluation of such dependencies.
Highlights
Modern construction industry focuses on the rational design of sustainable building
Additional aim of this paper is to show the close relationship between behaviour of semi-rigid joints and the need to use the second-order analysis
This paper presents the analysis of steel frame structures with different stiffness of joints is considered
Summary
Modern construction industry focuses on the rational design of sustainable building. The challenges of recent sustainable development require a reliable solution (Zavadskas et al, 2013), which, in many cases, is characterized by accurate structural analysis and advanced design solutions (Turskis et al, 2019). Steel structures, compared with the other, are slender (Giżejowski et al, 2017), and chosen analysis and numerical modelling methods could have huge impact to the design result of the framed structure (Kala, 2016) and selection of steel elements (Morkhade & Gupta, 2015). Slenderness of steel structures are the determining factor for design sensitivity for second-order impacts (Yoo & Lee, 2011). The second-order effects analysis differs from the first-order by the fact that the deformed shape of the structure is evaluated. Deformed shape of the structure (second-order factors) must be taken into account if they significantly change the value of internal forces or substantially change the behaviour of the structure (Dell‘Aglio et al, 2019; Park & Yeo, 2017). Additional aim of this paper is to show the close relationship between behaviour of semi-rigid joints and the need to use the second-order analysis
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