Tests of Fabricated Tubular Columns

Experimentelle Untersuchungen an hochfesten Rohren für den Kran‐ und Gerüstbau

“…Bereits durch Auf‐ und Abwickeln des Coils kann es bei zu kleinen Coil‐Radien zu plastischen Verformungen kommen, die durch die erforderliche Begradigung Eigenspannungen einprägen. Da durch die anschließende Kaltumformung das Blech vollständig durchplastiziert und sich Spannungsblöcke in Höhe der Fließgrenze des Blechs f y,s einstellen, erfolgt eine Änderung der Poissonzahl ν von 0,3 zu 0,5 [9]. Somit werden auch in Richtung der späteren Rohrachse 50,0 % der Spannungen in Tangentialrichtung ϑ in die Längsrichtung x eingebracht (Bild 2).…”

Investigations into residual stresses in S690 cold-formed circular hollow sections due to transverse bending and longitudinal welding

“…It should be noted that through thickness distributions of the residual stresses could not be measured with these strain gauges. In many cases, the residual stresses were assumed to vary linearly across the plate thicknesses [7,8,9,10,11,12,13,14] though non-linear distributions were reported in some theoretical investigations [3,7]. Although Whittemore gauges and curvature dials were used from time to time in the residual stress measurements, accuracy of the measured values was somehow unwarranted [13].…”

“…Based on experimental data reported in the literature, Wagner et al [36] proposed a bi-linear model to describe the residual stress model in the CFCHS while a multi-linear model is proposed by Chen and Ross [7]. These residual stress models are plotted in Figure 26a) together with the predicted residual membrane stresses of Sections C1 and C2.…”

Flexural buckling of normal and high strength steel CHS columns

“…The buckling behaviour of normal strength steel CHS columns has been investigated extensively, such as by D'Huart [5] and Ochi and Choo [6] on hot-finished CHS, by Guiaux [7] and Dundu and Chabalala [8] on cold-formed CHS and by Chen and Ross [9] and Shi et al [10] on fabricated CHS. On the other hand, for high strength steel CHS, column buckling test data are still relatively scarce.…”