Sándor Ádány

Experimental Studies on Deep Trapezoidal Sheeting with Perforated Webs

AbstractIn this paper, the behavior of deep trapezoidal sheeting with perforated webs is studied. The analyzed panel has longitudinal stiffeners both in the webs and flanges, which improves the load-bearing capacity but makes the behavior more complicated. The considered panel is produced with and without web perforations. When web perforation is applied, it is located in the middle part of the web. The primary aim of web perforation is to enhance noise resistance, but it also has an influence on the static behavior. Because reliable design rules for web-perforated trapezoidal sheeting panels are not available, an experimental program is undertaken: panels with and without web perforations are tested in parallel. The test setup and specimens are designed to provide information on all the behavior modes. On the basis of the test results, it is possible to define the degrading effect of web perforation on the rigidity, bending, and shear resistances and on the resistance to direct transverse forces close to...

Buckling Analysis of Unbranched Thin-Walled Members: Generalised Beam Theory and Constrained Finite Strip Method

The load-carrying capacity of thin-walled members is often governed by buckling phenomena. Usually, three main families of buckling phenomena/modes are considered: (i) global buckling, in which the member axis deforms (e.g., flexural or lateral-torsional buckling), (ii) local-plate buckling, involving only plate (wall) bending, and (iii) distortional buckling, combining wall bending with crosssection distortion the last two phenomena are sometimes jointly described as “local buckling”. Although there exist several numerical and/or analytical methods to determine the buckling load/moment values and the associated buckling mode shapes, it is fair to state that only generalised beam theory (GBT) and the constrained finite strip method (cFSM) are able to perform this task for isolated (“pure”) or arbitrarily combined (“coupled”) modes. Although both methods lead to very similar solutions, (i) GBT is a generalisation of classical beam theories that includes additional degrees of freedom to allow for cross-section deformation, whilst (ii) cFSM is a specialisation of the classical plate theory that carefully selects constraints in order to force the member to deform (buckle) according to pre-defined configurations. This paper provides an in-depth comparison between the fundamentals of the two above approaches (GBT / cFSM), focusing on (i) their mechanical assumptions and domains of application, and (ii) the procedures adopted. This will contribute to a better understanding of both methods and the phenomena that they aim to uncover, thus paving the way to the development of more efficient tools for the analysis and design of thin-walled members. In order to illustrate the GBT / cFSM comparison, the local, distortional and global buckling behaviours of lipped channel columns (see Figure 1) and beams are analysed in detail. As one would expect, there is a virtually perfect coincidence between the two sets of buckling results. Open image in new window Figure 1 Variation of the buckling load P b with the column length L

Experimental and Analytical Studies on the Cyclic Behaviour of Column-Base Joints

End-plate-type joints are widely used in steel frame structures, connecting either two steel elements (like beam-to-column, beam-to-beam or column-to-column joints) or a steel and a concrete/reinforced concrete element (like column-base joints or joints of a steel beam and a reinforced concrete column). Although these joints have numerous practical advantages, their application results in a more complicated structural behaviour which must be considered in the design.

Moment-rotation model of steel-to-concrete end-plate connections

Publisher Summary This chapter introduces a prediction model for the moment-rotation behavior of endplate type steel-to-concrete connections under combined axial force and bending moment. The developed model predicts the global response of the connection from the local behavior of the “tension” and “compression” zones. Steel-to-concrete mixed connections are connecting steel, concrete, reinforced concrete and composite structural elements. End-plate type mixed connections are applied in steel beam-to-reinforced concrete or composite column joints and steel or composite column bases. The load-deformation relationships of the zones are analyzed by two nonlinear 2D FEM models. The calculated moment-rotation curves are presented and compared to the experimental results and to a simplified analytical method. It is concluded that the proposed method provides good prediction for the initial range of the moment-rotation relationship but underestimates the ultimate moment capacity.