Concrete-filled cold-formed circular steel tubes subjected to variable amplitude cyclic pure bending

2008 ◽  
Vol 30 (2) ◽  
pp. 287-299 ◽  
Author(s):  
Mohamed Elchalakani ◽  
Xiao-Ling Zhao
Keyword(s):  
Pure Bending ◽  
Steel Tubes ◽  
Variable Amplitude

Effect of Lu¨ders Bands on the Bending Capacity of Steel Tubes

2010 ◽  
Author(s):  
Julian F. Hallai ◽  
Stelios Kyriakides
Keyword(s):  
Limit State ◽  
Solution Procedure ◽  
Inhomogeneous Deformation ◽  
Pure Bending ◽  
Steel Tubes ◽  
Deformation Regime ◽  
Bending Capacity ◽  
The Moment ◽  
T Values ◽  
Structural Instabilities

In several offshore applications hot-finished pipe that often exhibits Lu¨ders bands is bent to strains of 2–3%. Lu¨ders banding is a material instability that leads to inhomogeneous plastic deformation in the range of 1–4%. It can precipitate structural instabilities and collapse of the pipe. Experiments and analysis are used to study the interaction of the prevalent structural instabilities under bending with Lu¨ders banding, with the objective of providing guidance to the designer. Pure bending experiments on tubes of various D/t values reveal that Lu¨ders bands result in the development of inhomogeneous deformation in the structure, in the form of coexistence of two curvature regimes. Under rotation controlled bending, the higher curvature zone(s) gradually spreads while the moment remains essentially unchanged. For relatively low D/t tubes with relatively smaller Lu¨ders strain, the whole tube eventually is deformed to the higher curvature, subsequently entering the usual hardening regime where it continues to deform uniformly until the expected limit state is reached. For higher D/t tubes and/or for materials with longer Lu¨ders strain, the structure collapses during the inhomogeneous deformation regime. This class of problems is analyzed using 3D finite elements and an elastic-plastic constitutive model with an up-down-up material response. It will be demonstrated that the solution procedure followed can simulate the experiments with consistency.

Response and Stability of Square Tubes Under Bending

1997 ◽  
Vol 64 (3) ◽  
pp. 649-657 ◽  
Author(s):  
S. P. Vaze ◽  
E. Corona
Keyword(s):  
Analytical Model ◽  
Cross Section ◽  
Thickness Ratio ◽  
Pure Bending ◽  
Steel Tubes ◽  
Elastic Plastic ◽  
Plastic Steel

This paper addresses the response and stability of elastic-plastic steel tubes with square cross section under pure bending. An analytical model with sufficiently nonlinear kinematics to capture the development of ripples in the compression flange was developed. the results indicate that collapse of such tubes is imperfection sensitive for tubes with “high” height-to-thickness ratio (h/t), but the sensitivity decreases as h/t decreases. Experimentally, the tubes collapse due to a limit moment instability which is followed by the formation of a kink on the compression flange of the tubes. The limit moment and the development of the kink are captured well by the analytical model.

A tube with a rectangular cut-out. Part 1: Subject to pure bending

2006 ◽  
Vol 220 (5) ◽  
pp. 625-643 ◽  
Author(s):  
B. J. Vartdal ◽  
S. T. S. Al-Hassani ◽  
S. J. Burley
Keyword(s):  
Fracture Behaviour ◽  
Deformation Behaviour ◽  
Plastic Hinge ◽  
Shell Structures ◽  
Pure Bending ◽  
Steel Tubes ◽  
Jacket Structures ◽  
Axial Dimension ◽  
Semi Empirical ◽  
And Control

The response to pure bending of tubes with rectangular cut-outs is considered. Experiments on 1000-mm long, 100-mm diameter, and 2.55-mm wall thickness DIN 2391 ST NBK supported steel tubes are described. Such a thickness-to-diameter ratio is typical of structural columns, rather than shell structures. Tubes containing cut-outs with an axial dimension of up to 30 mm and a circumferential size of up to 180° were tested. It was found that plastic hinge mechanisms dominated the response when the cut-out was on the compressive side, whereas fracture behaviour dominated the response when the cut-out was on the tensile side. Finite element and semi-empirical analyses were carried out to predict the global load-deformation behaviour of the tubes. All analyses gave reasonable predictions of the experimental results for the majority of the cut-out parameters investigated. The aim of this study is to investigate the feasibility of using cut-outs to initiate and control the toppling of offshore jacket structures.

scholarly journals Experimental Evaluation of the Bending Behavior of a Drilled Shaft with Partial Casing under Lateral Loads

2021 ◽  
Vol 11 (20) ◽  
pp. 9469
Author(s):  
Xiaojuan Li ◽  
Guoliang Dai ◽  
Xueying Yang ◽  
Qian Yin ◽  
Wenbo Zhu ◽  
...  
Keyword(s):  
Bending Moment ◽  
Steel Tube ◽  
Strain Gauges ◽  
Lateral Loads ◽  
Bond Quality ◽  
Pure Bending ◽  
Steel Tubes ◽  
Concrete Pile ◽  
Longitudinal Strains ◽  
Steel Rebars

Few studies, especially those related to field tests, have examined the bending behaviors of drilled shafts with partial casings (DSPCs). This work reports the results of experimental studies on the behavior of DSPCs under lateral loads, including an in situ test and a set of laboratory tests. First, a DSPC with a diameter of 2 m and length of 87.9 m was studied in clay beds, and a steel casing with a diameter of 2.0 m and length of 33 m was used. In this test, strain gauges were distributed along the steel rebars in the concrete pile and the wall of the steel tube at different depths, and thus the longitudinal strains of the concrete pile and the steel tube could be studied. Second, laboratory experiments were implemented with reinforced concrete-filled steel tubular columns under pure bending conditions. In these tests, strain gauges were distributed along the steel rebars in the concrete pile and the walls of the steel tubes at the pure bending section of the specimens. Different wall thicknesses and drilling fluid conditions were considered. The field test results show that the strain of the concrete piles and the steel tubes were linearly distributed at the same cross-section. This means that a DSPC remains a flat plane after it deforms. Whereas a correction coefficient related to the loading level need to be considered in the calculation of the bending stiffness. Laboratory studies show that the strain of DSPCs was linearly distributed at a small bending moment under the best bond-quality condition, whereas obvious nonlinear behaviors were shown under a large bending moment with poor bond-quality conditions.

Review of strength behaviour of circular concrete filled steel tubes under monotonic pure bending

2019 ◽  
Vol 158 ◽  
pp. 460-474 ◽  
Author(s):  
Yasoja K.R. Gunawardena ◽  
Farhad Aslani ◽  
Brian Uy ◽  
Won-Hee Kang ◽  
Stephen Hicks
Keyword(s):  
Pure Bending ◽  
Steel Tubes ◽  
Concrete Filled Steel Tubes

Pure bending creep of SUS 304 stainless steel tubes

2002 ◽  
Vol 2 (6) ◽  
pp. 461-474 ◽  
Author(s):  
Kuo-Long Lee ◽  
Wen-Fung Pan
Keyword(s):  
Stainless Steel ◽  
304 Stainless Steel ◽  
Pure Bending ◽  
Steel Tubes
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