Abstract
This paper presents a numerical study on the behavior of extended stiffened end plate bolted beam-to-column joints subjected to sudden column removal. To this aim, finite element analyses, validated against experimental tests available from literature, were carried out to investigate the response of the joints under catenary action. The influence of additional bolt rows, generally ineffective in case of design for pure bending response, was also examined and some practical design implications have been drawn up from the parametric study.
Highlights
In the last decades, the worldwide increase of terrorist attacks on civil structures and infrastructures led to an increasing interest in structural design for guaranteeing robustness against progressive collapse, which can be defined as the propagation of local failure from element to element leading at the end to the collapse of an entire structure or a disproportionately large part of it
The progressive collapse response of steel moment-resisting structures is strongly influenced by the performance of the beam-to-column joints
A numerical study about the response of extended stiffened end plate bolted beam-tocolumn joints under column loss scenario was carried out on the basis on FE model analysis validated against comparison with available experimental test results
Summary
The worldwide increase of terrorist attacks on civil structures and infrastructures led to an increasing interest in structural design for guaranteeing robustness against progressive collapse, which can be defined as the propagation of local failure from element to element leading at the end to the collapse of an entire structure or a disproportionately large part of it. The lack of code requirements for robustness of ESEP joints motivates the study presented in this paper, which focuses on the influence of design detailing (e.g. steel grade, bolt strength and increase of number of bolt rows) on the development of catenary action, and in which term second order bending moment due to catenary actions affects the joint ductility. To this aim, parametric analyses based on finite element models (FEM) were carried out. The paper is organized in three main parts, namely: i) the modelling assumptions and validation against test results; ii) parametric study; iii) discussion of the results
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