05.07: Structural behaviour of simple steel beams subject to axial compression, biaxial bending moments and torsion

ce/papers ◽  
2017 ◽  
Vol 1 (2-3) ◽  
pp. 1076-1085 ◽  
Author(s):  
Adrian Walter ◽  
Julia Herbersagen ◽  
Rebekka Winkler ◽  
Markus Knobloch
Keyword(s):  
Axial Compression ◽  
Steel Beams ◽  
Bending Moments ◽  
Biaxial Bending ◽  
Structural Behaviour

A characteristic type of instability in the large deflexions of elastic plates III. Curved rectangular plates in axial compression

1954 ◽  
Vol 222 (1148) ◽  
pp. 44-59 ◽  
Keyword(s):  
Axial Compression ◽  
Rectangular Plates ◽  
Bending Moments ◽  
Elastic Plates ◽  
Characteristic Type ◽  
Circular Tubes ◽  
Axis Parallel ◽  
Post Buckling ◽  
Thin Walled ◽  
The Stability

The analysis of part I is extended to deal with the case of free-edged rectangular plates having an initial curvature about an axis parallel to one pair of opposite edges and loaded by distributed bending moments applied to the straight edges and compressive forces applied to the curved edges. In particular, the stability and post-buckling behaviour of such plates subjected to the compressive forces alone is studied. The axially symmetrical buckling of thin-walled circular tubes in axial compression is also considered. Experimental plates are found to buckle at loads rather lower than those predicted.

Structural behaviour of arched steel beams with cellular openings

2018 ◽  
Vol 148 ◽  
pp. 756-767 ◽  
Author(s):  
O.F. Zaher ◽  
N.M. Yossef ◽  
M.H. El-Boghdadi ◽  
M.A. Dabaon
Keyword(s):  
Steel Beams ◽  
Structural Behaviour

Moment Measurements in Dynamic and Quasi-Static Spine Segment Testing Using Eccentric Compression are Susceptible to Artifacts Based on Loading Configuration

2014 ◽  
Vol 136 (12) ◽  
Author(s):  
Carolyn Van Toen ◽  
Jarrod W. Carter ◽  
Thomas R. Oxland ◽  
Peter A. Cripton
Keyword(s):  
Axial Compression ◽  
Load Cell ◽  
Bending Moments ◽  
Equilibrium Equations ◽  
Test Configuration ◽  
Hinge Joint ◽  
Rubber Specimen ◽  
Eccentric Compression ◽  
Dynamic Experiments ◽  
Spine Segment

The tolerance of the spine to bending moments, used for evaluation of injury prevention devices, is often determined through eccentric axial compression experiments using segments of the cadaver spine. Preliminary experiments in our laboratory demonstrated that eccentric axial compression resulted in “unexpected” (artifact) moments. The aim of this study was to evaluate the static and dynamic effects of test configuration on bending moments during eccentric axial compression typical in cadaver spine segment testing. Specific objectives were to create dynamic equilibrium equations for the loads measured inferior to the specimen, experimentally verify these equations, and compare moment responses from various test configurations using synthetic (rubber) and human cadaver specimens. The equilibrium equations were verified by performing quasi-static (5 mm/s) and dynamic experiments (0.4 m/s) on a rubber specimen and comparing calculated shear forces and bending moments to those measured using a six-axis load cell. Moment responses were compared for hinge joint, linear slider and hinge joint, and roller joint configurations tested at quasi-static and dynamic rates. Calculated shear force and bending moment curves had similar shapes to those measured. Calculated values in the first local minima differed from those measured by 3% and 15%, respectively, in the dynamic test, and these occurred within 1.5 ms of those measured. In the rubber specimen experiments, for the hinge joint (translation constrained), quasi-static and dynamic posterior eccentric compression resulted in flexion (unexpected) moments. For the slider and hinge joints and the roller joints (translation unconstrained), extension (“expected”) moments were measured quasi-statically and initial flexion (unexpected) moments were measured dynamically. In the cadaver experiments with roller joints, anterior and posterior eccentricities resulted in extension moments, which were unexpected and expected, for those configurations, respectively. The unexpected moments were due to the inertia of the superior mounting structures. This study has shown that eccentric axial compression produces unexpected moments due to translation constraints at all loading rates and due to the inertia of the superior mounting structures in dynamic experiments. It may be incorrect to assume that bending moments are equal to the product of compression force and eccentricity, particularly where the test configuration involves translational constraints and where the experiments are dynamic. In order to reduce inertial moment artifacts, the mass, and moment of inertia of any loading jig structures that rotate with the specimen should be minimized. Also, the distance between these structures and the load cell should be reduced.

Moment redistribution in cold-formed steel sleeved and overlapped two-span purlin systems

2018 ◽  
Vol 21 (16) ◽  
pp. 2534-2552 ◽  
Author(s):  
Pinelopi Kyvelou ◽  
Chi Hui ◽  
Leroy Gardner ◽  
David A Nethercot
Keyword(s):  
Carrying Capacity ◽  
Steel Beams ◽  
Finite Element Models ◽  
Load Carrying Capacity ◽  
Structural Behaviour ◽  
Moment Redistribution ◽  
Load Carrying ◽  
Parametric Studies ◽  
Physical Tests ◽  
Cold Formed Steel

Cold-formed steel purlin systems with overlapped or sleeved connections are alternatives to continuous two-span systems and exhibit different degrees of continuity. Both connection types are highly favourable in practice since they are both strategically placed over an interior support to provide additional moment resistance and rotational capacity where the corresponding demands are at their largest, thus improving the overall structural efficiency. Until recently, full-scale testing has been the most common way of investigating the structural behaviour of such systems. In this study, numerical modelling, capable of capturing the complex contact interactions and instability phenomena, is employed. The developed finite element models are first validated against data from physical tests on cold-formed steel beams featuring sleeved and overlapped connections that have been previously reported in the literature. Following their validation, the models are employed for parametric studies, based on which the structural behaviour of the examined systems is explored, while the applicability of conventional plastic design as well as of a previously proposed design approach is investigated. Finally, the efficiency of these systems in terms of load-carrying capacity is compared with their equivalent continuous two-span systems.

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